W-300-3

W-300-3
RINGFEDER
®
KEYLESS SHAFT/HUB
CONNECTIONS
LOCKING ASSEMBLIES TM
LOCKING ELEMENTS TM
SHRINK DISCS ®
W-300-3
1
Ringfeder Corporation
Catalog W-300-3
Shaft-Hub Locking Devices
Ringfeder ® unique frictional, keyless shaft-hub locking devices provide an easily
adjustable and releasable mechanical shrink-fit. They offer all the advantages of
shrink-fits – without the problems. Torque or axial loads are transmitted by radial
clamping pressures and friction between the functional surfaces of the locking device,
shaft and hub.
Working Principle
Ringfeder ® shaft-hub locking devices are based on the inclined plane or taper principle. Clamping forces generated by torqued up locking screws are translated into predetermined contact pressures so as to create mechanical shrink-fit connections.
Applications
Ringfeder ® frictional shaft-hub locking devices have successfully solved shaft-hub
connection problems involving:
Gears
Rolls
Cams
Levers
Winches
Sprockets
Flanges
Couplings
Brake drums
Sheaves
Flywheels
Hand wheels
Clutches
Fan wheels
Worm gears
Bevel gears
Helical gears
Mixer shafts
Crane wheels
Bucket wheels
Pump impellers
Turbine rotors
Conveyer pulleys
Ship propellers
Windmill propellers
Rock-cutting heads
Shaft-mounted gear units
Advantages
• Elimination of keys, keyways or splines and associated fitting costs
• Completely tight fit around shaft – no backlash
• Impervious to reversing, dynamic or shock loads
• Transmission of high torques and axial loads
Benefits
• Reduced machining costs
• Easy installation, assembly and disassembly
• Easy axial and angular adjustments and timing
2
Catalog W-300-3
1
Product Overview
Locking AssembliesTM RfN 7012
INTERNAL
These are the original Ringfeder®
Locking AssembliesTM featuring doubletapered thrust rings with selfreleasing tapers. They bridge
relatively large fit clearances, are
easy to install, adjust or remove, but
are not self-centering. A precentering
hub section is usually required.
These units are most commonly used
on applications in general engineering
to transmit high torques and axial loads
utilizing larger machining tolerances.
Available sizes:
INCH SERIES for shafts from 3/4” to
7.875” dia.
METRIC SERIES for shafts from 20 mm
to 1000 mm dia.
2
Applied wherever self-centering action
and good concentricity of mounted
components are essential and hubs
with straight-thru bores are used.
Available sizes:
INCH SERIES for shafts from 1” to 4” dia.
METRIC SERIES for shafts from 20 mm
to 150 mm dia.
3
Locking AssembliesTM RfN 7013
These Locking AssembliesTM are of
single-taper design with a self-locking
taper providing good self-centering
action and concentricity, as well as
increased torque capacity. A precentering hub section is not required.
Integral push-off screws for disassembly are provided.
These assemblies are available in
two types:
Straight-thru type: RfN 7013.0
Flange type:
RfN 7013.1
Flange type units fix the hub positively
against their extended flange
preventing axial movement during
tightening.
Shrink Discs® RfN 4071, 4051, 4091
EXTERNAL
The Shrink Discs ® are external locking
devices installed over hub projections.
By tightening the locking screws, the
locking collars exert radial forces on
the tapered ring and on the hub. After
bridging the fit clearances, radial clamping
pressure is generated between shaft and
hub establishing a solid, frictional
connection. For adjustment or removal, just
unscrew the bolts.
,
Split Shrink Discs® RfN 4071-SR, 4051-SR, 4091-SR
They are basically the standard Shrink
Discs ® with two separate half inner rings
offering greater mounting versatility and
allowing symmetrical hub designs. Split
Shrink Discs ® can also be used as Half
Shrink Discs® transmitting half the catalog
rated torque. Then, either clearance or
tapered holes need to be provided in the
hub for the locking screws.
Shrink Discs® RfN 4171
Applied for transmission of very high
torques, particularly when external
clamping is advantageous and excellent
concentricity is required.
Available sizes:
The Shrink Discs® accommodate both
inch and metric shafts ranging from
0.75” to 34” dia.
RfC Low Inertia Series Shrink Discs ®
Sizes 10 to 50 for smaller shaft sizes.
This new RfN 4171 Shrink Disc® employs
a single, long, shallow taper instead of
opposing tapers of the traditional Ringfeder®
three-piece series (RfN 4071). Better
centering and concentricity result, making
the Shrink Disc® especially suitable for highspeed applications where balance is critical.
Installation is also simplified. When the
fasteners are properly torqued, the
installer has a visual aid to indicate
correct installation, i.e., the inner ring
face should be flush with the outer ring
face.
Available sizes:
Shafts from 3/4” to 16.5”, and torques
from 136 lb-ft to 860,000 lb-ft.
Low Inertia Series Shrink Disc® for Small Shafts
RfC Low Inertia Series Shrink Discs ®
Sizes 10 to 50 for smaller shaft sizes.
INTERNAL
Heavy Duty Shrink Discs® 4091 for Smaller Shafts
Locking ElementsTM RfN 8006/GSA
Locking ElementsTM consist of an internal
and an external tapered ring. When axial
force is exerted on a set of Locking
ElementsTM, radial clamping pressures are
generated on the shaft and in the hub bore
providing a frictional connection. Upon
release of the clamping force, the hub can
be adjusted or removed.
Low Profile Torque Wrenches
The ABC’s of Locking Devices
Catalog W-300-3
Applied for lower torques and smaller
shafts. By varying the clamp force,
number of Locking Element TM sets and
clamping arrangements, different
design configurations can be achieved.
Available sizes:
INCH sizes (GSA Series) for shafts from
1/4” to 3” dia.
METRIC sizes (RfN 8006 Series) for
shafts from 6 mm to 1000 mm dia.
4
5
6
7
7a
8
9
10
3
2
Ringfeder ®
Locking Assemblies TM
RfN 7012 & RfN 7012-IN
Ringfeder ® Locking AssembliesTM are completely self-contained,
frictional shaft-hub locking devices. Designed to generate an easily
adjustable and releasable mechanical shrink-fit, they have been
used successfully for many years in heavy-duty applications to
transmit high torques and dynamic loads and to provide timing
and releasability.
Applications Examples
Fig. 1: Drive Pulley
Drive pulley with 280 mm dia. (11.024”)
Locking AssembliesTM and bend pulley
with 95 mm dia. (3.740”) Locking
AssembliesTM.
Fig. 2: Lower Band Wheels
Lower band wheels of a twin band saw
fastened with 7” RfN 7012-IN Locking
AssembliesTM.
Fig. 3: Gears
Gears fitted with RfN 7012
Locking AssembliesTM.
Fig. 5: Drive
Pulley
Drive pulley of a
gondola ski lift
fastened with a
300 x 375 RfN
7012 Locking
AssemblyTM.
Fig. 4: Sprockets
Input shaft for 750 HP draw works showing
applications of Locking AssembliesTM and
adaptor flanges.
4
Fig. 6: Pinion Gear
Pinion gear and flywheel both mounted
with RfN 7012 Locking AssembliesTM.
Catalog W-300-3
Fig. 7: Cutter Heads
Cutter heads fastened with
Locking AssembliesTM.
2
Selection Guide
1. Determine the required shaft diameter (d) or
maximum torque (Mt ) to be transmitted:
Torque Mt = 5252 x HP (lb-ft)
RPM
If combined torsional and axial loads are to be transmitted, calculate the resulting torque as follows:
Mt res =
√
Mt2 +
(P 24x d)
ax
2
5. Check the applicable machining tolerance for the
shaft and hub bore in the specification tables. A surface finish of 125 micro-inches for shafts and bores is
generally adequate.
6. Determine the required Locking AssemblyTM by specifying the size (d x D) from Tables 1 & 2 followed by
the series number, e.g.: 100 x 145 RfN 7012.
≤ Mt cat
Mt res = resultant torque to be transmitted
Mt
= actual or maximum torque to be
transmitted (lb-ft)
Pax
= axial load/thrust to be transmitted (lbs)
d
= shaft diameter (inches)
Mt cat = maximum transmissible torque (lb-ft) of
Locking AssemblyTM as specified
2. Select a Locking AssemblyTM for the shaft diameter
(d) from the specification tables and verify that the
corresponding maximum transmissible torque (Mt)
meets the torque requirement.
If torque is the primary requirement, select the necessary torque (Mt) from the same specification tables
and determine the corresponding shaft diameter (d).
Note: Required peak torque should never exceed specified
transmissible torque (Mt ).
To increase transmissible torque (Mt ):
a. Install 2 or 3 Locking AssembliesTM in series,
increasing transmissible torque as follows:
- with 2 Locking AssembliesTM: Mtrans.= 2 x Mt
- with 3 Locking AssembliesTM: Mtrans.= 3 x Mt
- (see Fig. 8: Hub Layout and Fig. 9).
The hub must be long enough to accommodate
the assemblies.
b. Increase screw tightening torque (MA) by up to
20%. Transmissible torque (Mt) and contact
pressures (p, p’) increase proportionately.
3. Determine the recommended minimum hub outside
diameter (DN) for the Locking AssemblyTM selected
from the specification tables or calculate the hub outside diameter (DN) by using the following equation:
DN ≥ D x
√
YP + C3 x p’
YP - C3 x p’
Where YP = yield point of hub material (lbs/sq.in.)
p’ = p x d/D (lbs/sq.in.)
B = ≥ min. 2 x I (inches); see Example
C3 = 0.6 (one locking assembly)
C3 = 0.8 (2 or 3 Locking AssembliesTM in series)
4. Verify that the hub length (B) is adequate for the
selected Locking AssemblyTM; see Example.
Fig. 8: Hub Layout
Typical layout for a Locking AssemblyTM installation.
Note: When accurate centering of the hub is required,
establish a proper fit tolerance for the pilot or centering
portion of the hub.
EXAMPLE
A spur gear is to be mounted on a 3.9375” dia. shaft capable of
transmitting a peak torque of 5,750 lb-ft. The gear is made of 1040
AISI steel (Y.P. 36,000 psi). Select the proper Locking AssemblyTM
and determine the required hub dimensions and proper machining
tolerances.
1. The shaft diameter is specified at 3.9375”.
2. The specification tables indicate that a 3-15/16 Locking
AssemblyTM is capable of transmitting a torque (Mt) of 6,944
lb-ft, more than the required amount. Select the 3-15/16
Locking AssemblyTM.
3. The specification tables indicate that the selected 3-15/16
Locking AssemblyTM requires a minimum hub outer diameter of
8.000” based on Y.P. 36,000 psi hub material.
4. The hub length (B) should be 2 x L1. Fig. 8 indicates that L1 =
1.852”. Therefore, B = 2 x 1.852” = 3.704” (minimum).
Since the gear must be concentric within .0025”, specify the
following fit tolerance for the pilot bore:
shaft:
3.9375/3.9365”
bore:
3.9375/3.9390”
5. According to the specification tables, the machining tolerances
for the selected Locking AssemblyTM are as follows:
shaft:
+.000/-.0035”
counter bore:
-.000/+.0035”
However, because of the concentricity requirements for the gear,
tighter tolerances are needed for the shaft and pilot bore.
The counter bore tolerances for the Locking AssemblyTM are
-.0000/+.0025” (within the permissible limits and in accordance
with the fit tolerance specified in Step 4 above).
6. Order the following assembly:
Size
RfN
Series
Metric:
100 x 145
RfN
7012
Inch:
3-15/16
RfN
7012-IN
Catalog W-300-3
5
2
Inch Series Locking AssembliesTM RfN 7012-IN Specifications
d = nominal Locking AssemblyTM I.D.
= shaft O.D.
T1 = machining tolerances for shaft (d)
D = nominal Locking AssemblyTM O.D.
= hub counter bore I.D.
T2 = machining tolerances for counter bore (D)
L, I, L1 = width dimensions, relaxed condition
Mt = maximum transmissible torque
p = contact pressure between Locking AssemblyTM and shaft
dG = metric socket head cap screw size
s = metric hex key size (across flats)
MA = required tightening torque per locking screw (tighten with
torque wrench)
dD = metric pull-out thread (under zinc-plated screws only)
DN = minimum hub O.D. for single-unit installation and based on
Y.P. 36,000 psi hub material (for other hub materials
calculate hub O.D. per step 3 of Selection Guide)
Fig. 9
Table 1: Inch Series Locking AssemblyTM RfN 7012-IN
Material: Medium Carbon Steel*
Locking AssemblyTM dimensions
RfN
7012-IN
Size
d
T1
D
T2
inches
1-3/4
1
1-1/8
1-3/16
1-1/4
1-3/8
1-7/16
1-1/2
1-5/8
1-11/16
1-3/4
1-7/8
1-15/16
2
2-1/8
2-3/16
2-1/4
2-3/8
2-7/16
2-1/2
2-9/16
2-5/8
2-11/16
2-3/4
2-7/8
2-15/16
3
3-1/8
3-1/4
3-3/8
3-7/16
3-1/2
3-3/4
3-15/16
4
4-7/16
4-1/2
4-15/16
5
5-1/2
6
6-1/2
7
7-1/2
7-7/8
.750
1.000
1.125
1.1875
1.250
1.375
1.4375
1.500
1.625
1.6875
1.750
1.875
1.9375
2.000
2.125
2.1875
2.250
2.375
2.4375
2.500
2.5625
2.625
2.6875
2.750
2.875
2.9375
3.000
3.125
3.250
3.375
3.4375
3.500
3.750
3.9375
4.000
4.4375
4.500
4.9375
5.000
5.500
6.000
6.500
7.000
7.500
7.875
+0
–.002
1.850
1.969
2.165
2.159
2.362
2.365
2.559
2.559
2.953
2.953
2.953
3.150
3.150
3.346
3.346
3.543
3.543
3.531
3.740
3.740
3.737
4.331
4.331
4.337
4.528
4.528
4.724
4.724
4.921
4.921
5.118
5.118
5.305
5.708
5.843
6.496
6.496
7.087
7.087
7.492
8.268
8.858
9.252
9.823
10.235
–0
+.002
+0
–.0025
+0
–.003
+0
–.0035
+0
–.004
+0
–.0045
–0
+.0025
–0
+.003
–0
+0035
–0
+.004
–0
+.0045
L
.787
.787
.787
.813
.787
.776
.787
.787
.945
.945
.945
.945
.945
.945
.945
.945
.945
.996
.945
.945
.959
1.102
1.102
1.079
1.102
1.102
1.102
1.102
1.102
1.102
1.102
1.102
1.142
1.301
1.299
1.299
1.299
1.496
1.496
1.449
1.496
1.732
1.732
2.126
2.051
I
.669
.669
.669
.669
.669
.669
.669
.669
.787
.787
.787
.787
.787
.787
.787
.787
.787
.787
.787
.787
.787
.945
.945
.945
.945
.945
.945
.945
.945
.945
.945
.945
.945
1.024
1.024
1.024
1.024
1.339
1.339
1.339
1.339
1.496
1.496
1.811
1.811
max.
Mt
lb-ft
L1
1.083
1.083
1.083
1.108
1.083
1.071
1.083
1.083
1.319
1.319
1.319
1.319
1.319
1.319
1.319
1.319
1.319
1.370
1.319
1.319
1.333
1.555
1.555
1.532
1.555
1.555
1.555
1.555
1.555
1.555
1.555
1.555
1.594
1.852
1.850
1.850
1.850
2.047
2.047
2.000
2.047
2.362
2.362
2.756
2.681
1
1
1
1
1
1
1
1
1
1
2
2
2
3
3
3
3
3
3
3
4
4
4
4
5
6
7
8
9
12
12
15
19
23
27
33
37
185
275
345
362
459
506
608
636
070
109
150
222
259
519
613
656
700
787
098
148
199
120
195
320
450
522
580
731
426
593
629
716
714
944
016
897
027
282
434
088
290
037
008
633
973
Locking screws DIN 912 – 12.9
p
psi
28
27
23
24
28
25
28
27
32
28
30
28
27
30
29
28
27
25
28
27
27
30
29
29
28
27
27
25
26
27
26
25
27
27
27
28
27
24
24
24
25
23
23
21
21
450
000
720
900
000
600
450
000
700
430
000
450
000
600
150
450
000
600
450
750
000
514
804
850
450
750
000
400
950
750
300
600
750
750
000
450
750
200
200
200
600
450
450
350
350
Qty.
8
9
10
10
12
12
15
15
12
12
12
12
12
14
14
14
14
14
16
16
16
14
14
14
14
14
14
14
16
16
16
16
18
14
14
16
16
20
20
22
26
22
24
28
30
size
dG
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
6x18
6x18
6x18
6x18
6x18
6x18
6x18
6x18
8x22
8x22
8x22
8x22
8x22
8x22
8x22
8x22
8x22
8x22
8x22
8x22
8x22
10x25
10x25
10x25
10x25
10x25
10x25
10x25
10x25
10x25
10x25
10x25
10x25
12x30
12x30
12x30
12x30
12x35
12x35
12x35
12x35
14x40
14x40
14x45
14x45
s
mm
MA
lb-ft
dD
DN
inches
5
5
5
5
5
5
5
5
6
6
6
6
6
6
6
6
6
6
6
6
6
8
8
8
8
8
8
8
8
8
8
8
8
10
10
10
10
10
10
10
10
12
12
12
12
10.13
10.13
10.13
10.13
10.13
10.13
10.13
10.13
25.32
25.32
25.32
25.32
25.32
25.32
25.32
25.32
25.32
25.32
25.32
25.32
25.32
50.63
50.63
50.63
50.63
50.63
50.63
50.63
50.63
50.63
50.63
50.63
50.63
90.41
90.41
90.41
90.41
90.41
90.41
90.41
90.41
137.43
137.43
137.43
137.43
M 8
M 8
M 8
M 8
M 8
M 8
M 8
M 8
M 10
M 10
M 10
M 10
M 10
M 10
M 10
M 10
M 10
M 10
M 10
M 10
M 10
M 12
M 12
M 12
M 12
M 12
M 12
M 12
M 12
M 12
M 12
M 12
M 12
M 14
M 14
M 14
M 14
M 14
M 14
M 14
M 14
M 16
M 16
M 16
M 16
2.375
2.500
2.750
2.750
3.125
3.125
3.375
3.375
4.125
4.125
4.125
4.250
4.250
4.750
4.750
4.875
4.875
4.875
5.250
5.250
5.250
5.937
5.937
6.000
6.250
6.250
6.375
6.375
6.875
6.875
7.125
7.125
7.500
8.000
8.375
9.125
9.125
9.500
9.500
10.250
11.500
12.000
12.750
13.125
13.625
*Stainless steel available upon request.
Notes:
6
B = at least 2 x I, preferably 2 x L1 or more
Pax = axial load (thrust capacity)
= Mt x 24 lbs (for Mt in lb-ft)
d
p’
= constant pressure between Locking AssemblyTM and hub bore
Values of Mt, p, Pax, and p’ are based on lightly oiled
installation (coefficient of friction µ = 0.12)
p’ = p x d
D
Catalog W-300-3
2
Metric Series Locking AssembliesTM RfN 7012 Specifications
Table 2: Metric Series Locking AssemblyTM RfN 7012
Material: Medium Carbon Steel*
Locking AssemblyTM dimensions
RfN
7012
Size
mm
L
I
L1
.787
.787
.787
.669
.669
.669
1.083
1.083
1.083
.787
.787
.787
.669
.669
.669
1.083
1.083
1.083
275
340
362
27 000
26 300
24 900
9
9
9
M
M
M
.787
.787
.787
.669
.669
.669
1.083
1.083
1.083
456
506
630
26 397
25 600
27 628
12
12
15
2.559
2.953
2.953
.787
.945
.945
.669
.787
.787
1.083
1.319
1.319
665
1 085
1 165
25 600
32 634
29 850
3.150
3.150
3.346
.945
.945
.945
.787
.787
.787
1.319
1.319
1.319
1 230
1 280
1 642
.945
.945
1.102
.787
.787
.945
1.319
1.319
1.555
1.102
1.102
1.102
.945
.945
.945
1.102
1.102
1.229
d
T1
D
20 x 47
22 x 47
24 x 50
.787
.866
.945
+0
–.002
1.850
1.850
1.969
25 x 50
28 x 55
30 x 55
.984
1.102
1.181
32 x 60
35 x 60
38 x 65
1.260
1.378
1.496
40 x 65
42 x 75
45 x 75
1.575
1.654
1.772
48 x 80
50 x 80
55 x 85
1.890
1.969
2.165
60 x 90
65 x 95
70 x 110
2.362
2.559
2.756
75 x 115
80 x 120
85 x 125
2.953
3.150
3.346
90 x 130
95 x 135
100 x 145
3.543
3.740
3.937
110 x 155
120 x 165
130 x 180
4.331
4.724
5.118
140 x 190
150 x 200
160 x 210
5.512
5.906
6.299
170 x 225
180 x 235
190 x 250
6.693
7.087
7.480
200 x 260
220 x 285
240 x 305
7.874
8.661
9.449
+0
–.0045
10.236
11.220
12.008
260 x 325
280 x 355
300 x 375
10.236
11.024
11.811
+0
–.005
12.795
13.976
14.764
320 x 405
340 x 425
360 x 455
12.598
13.386
14.173
380 x 475
400 x 495
420 x 515
14.961
15.748
16.535
440
460
480
500
17.323
18.110
18.898
19.685
x
x
x
x
545
565
585
605
T2
inches
s
mm
5
5
5
MA
lb-ft
10.13
10.13
10.13
M 8
M 8
M 8
DN
inches
2.375
2.375
2.500
6x18
6x18
6x18
5
5
5
10.13
10.13
10.13
M 8
M 8
M 8
2.500
2.750
2.750
M
M
M
6x18
6x18
6x18
5
5
5
10.13
10.13
10.13
M 8
M 8
M 8
3.125
3.125
3.375
15
12
12
M
M
M
6x18
8x22
8x22
5
6
6
10.13
25.32
25.32
M 8
M 10
M 10
3.375
4.125
4.125
28 428
27 000
28 450
12
12
14
M
M
M
8x22
8x22
8x22
6
6
6
25.32
25.32
25.32
M 10
M 10
M 10
4.250
4.250
4.750
1 787
2 199
3 327
25 600
27 000
29 850
14
16
14
M 8x22
M 8x22
M 10x25
6
6
8
25.32
25.32
50.63
M 10
M 10
M 12
4.875
5.250
6.000
1.555
1.555
1.555
3 544
3 761
4 557
27 750
25 600
27 750
14
14
16
M 10x25
M 10x25
M 10x25
8
8
8
50.63
50.63
50.63
M 12
M 12
M 12
6.250
6.375
6.875
.945
.945
1.024
1.555
1.555
1.850
4 774
5 714
6 944
25 600
27 750
27 750
16
18
14
M 10x25
M 10x25
M 12x30
8
8
10
50.63
50.63
90.41
M 12
M 12
M 14
7.125
7.500
8.000
1.229
1.229
1.496
1.024
1.024
1.339
1.850
1.850
2.047
7 595
9 475
12 730
25 600
26 300
23 450
14
16
20
M 12x30
M 12x30
M 12x35
10
10
10
90.41
90.41
90.41
M 14
M 14
M 14
8.375
9.125
9.500
1.496
1.496
1.496
1.339
1.339
1.339
2.047
2.047
2.047
15 117
17 504
20 252
23 450
24 200
24 200
22
24
26
M 12x35
M 12x35
M 12x35
10
10
10
90.41
90.41
90.41
M 14
M 14
M 14
10.250
10.750
11.500
1.732
1.732
2.047
1.496
1.496
1.811
2.362
2.362
2.677
23 724
27 341
33 633
22 750
23 750
21 350
22
24
28
M 14x40
M 14x40
M 14x45
12
12
12
137.43
137.43
137.43
M 16
M 16
M 16
12.000
12.750
13.125
–0
+.0045
2.047
2.205
2.205
1.811
1.969
1.969
2.677
2.913
2.913
37 973
49 184
61 842
21 350
21 350
22 750
30
26
30
M 14x45
M 16x50
M 16x50
12
14
14
137.43
213.37
213.37
M 16
M 20
M 20
13.625
15.000
16.500
–0
+.005
2.205
2.598
2.598
1.969
2.362
2.362
2.913
3.406
3.406
75 223
92 582
110 665
23 450
20 600
21 350
34
32
36
M 16x50
M 18x60
M 18x60
14
14
14
213.37
292.94
292.94
M 20
M 22
M 22
17.750
18.625
20.000
3.071
3.071
3.543
2.835
2.835
3.307
3.957
3.957
4.567
151 893
162 019
212 650
21 350
20 600
20 600
36
36
36
M 20x70
M 20x70
M 22x80
17
17
17
419.51
419.51
564.17
M 24
M 24
M 27
21.500
22.250
23.875
3.543
3.543
3.543
3.307
3.307
3.307
4.567
4.567
4.567
222 776
232 903
270 514
19 200
18 500
19 200
36
36
40
M 22x80
M 22x80
M 22x80
17
17
17
564.17
564.17
564.17
M 27
M 27
M 27
24.625
25.250
26.625
4.016
4.016
4.016
4.016
3.780
3.780
3.780
3.780
5.118
5.118
5.118
5.118
329
339
372
405
18
17
17
17
40
40
42
44
M
M
M
M
19
19
19
19
723.30
723.30
723.30
723.30
M 30
M 30
M 30
M 30
27.750
28.625
29.625
30.625
–0
+.002
1.969
2.165
2.165
+0
–.0025
+0
–.003
2.362
2.362
2.559
3.543
3.740
4.331
–0
+.0025
–0
+.003
4.528
4.724
4.921
+0
–.0035
5.118
5.315
5.709
–0
+.0035
6.102
6.496
7.087
+0
–.004
7.480
7.874
8.268
–0
+.004
8.858
9.252
9.843
+0
–.0055
15.945
16.732
17.913
–0
+.0055
18.701
19.488
20.276
+0
–.006
Locking screws DIN 912 – 12.9
max.
Mt
lb-ft
195
217
260
21.457
22.244
23.031
23.819
–0
+.006
102
951
450
048
p
psi
29 850
27 750
27 750
Qty.
8
8
9
size
dG
M 6x18
M 6x18
M 6x18
500
800
800
800
24X90
24X90
24X90
24X90
dD
*Stainless steel available upon request.
For larger sizes or additional information, request catalog S76A.
Ordering Example
Metric:
Inch:
Size
100 x 145
3-15/16
RfN
RfN
RfN
Series
7012
7012-IN
Catalog W-300-3
7
2
Design Examples
Fig. 10: Locking AssemblyTM
Typical Ringfeder® Locking AssemblyTM connection.
Fig. 11: Coupling
Coupling half-mounted with a
RfN 7012 Locking AssemblyTM.
Here, the shaft is stepped to
permit the largest possible hub
cross-section.
Fig. 12: Impeller
Impeller mounted with a RfN
7012 Locking AssemblyTM. Here,
the locking device is protected
from moisture with a bolt-on cap.
Fig. 13
Hub mounted using two RfN 7012 Locking
AssembliesTM to transmit twice the torque.
Fig. 14
Hub fastened with two RfN 7012 Locking
AssembliesTM located at opposite ends of the
hub. In this arrangement twice the torque is
transmitted provided the hub length is less
than four times the width of the Locking
AssemblyTM. Bores must be concentric to
each other.
8
Fig. 15: Flat-Belt Pulley
Flat-belt pulley mounted with a RfN 7012
Locking AssemblyTM.
Catalog W-300-3
2
Installation and Removal Instructions
INSTALLATION
INSTALLATION TOOLS
1.
•
2.
3.
Verify that all contact surfaces, including the screw threads
and screw head bearing surfaces, are clean and lightly oiled.
Note: Do NOT use Molybdenum Disulfide, “Molykote” or
any other similar lubricants.
Slide the Locking AssemblyTM onto the shaft and into the
hub bore, aligning them as required.
Tighten the locking screws gradually in the sequence illustrated in Fig. 16: Tightening Sequence as follows:
a ) Hand-tighten 3 or 4 equally spaced locking screws until
they make contact. Align and adjust the connection.
b ) Hand-tighten and take up all remaining locking screws.
c ) Use a torque wrench to tighten the screws further to
approximately one-half the specified torque (MA).
d ) Using the torque wrench tighten the screws to full
tightening torque (MA).
e ) Verify that the screws are completely tight by applying
the specified tightening torque (MA).
NOTES
a ) Even tightening is best accomplished by turning each
screw in increments of approximately 90º.
b ) For the final pass it is recommended to set the torque
wrench by approximately 5% over the specified tightening torque (MA) to compensate for any possible settling.
•
•
Standard torque wrench with either 1/4”, 3/8”, 1/2” or 3/4”
square drive and suitable torque range; see Table 3:
Locking AssemblyTM Tightening Data for specified
tightening torques (MA).
Metric hexagonal-bit socket (Fig. 17: Square Drives) for
torque wrench with suitable dimension across flats (s); see
Table 3: Locking AssemblyTM Tightening Data.
Metric hexagonal key with across flats dimension (s).
NOTE: DO NOT USE IMPACT WRENCH!
Since the torque is transmitted by contact pressure and friction
between the frictional surfaces, the condition of the contact surfaces and the proper tightening of the locking screws are important.
Fig. 16: Tightening Sequence
Tightening sequence for locking screws.
REMOVAL
Ringfeder ® Locking AssembliesTM are not self-locking. The
individual rings are tapered so that the inner and outer rings
spring apart after the last screw has been loosened.
1 Loosen the locking screws in several steps
following a diametrically opposite sequence.
Do not remove the screws completely.
2 Remove the hub and Locking AssemblyTM from the shaft.
Fig. 18: Rear Thrust Ring Jams
If the rear thrust ring jams, tap lightly against the screw heads
to make it snap back.
REMOVAL TOOL
•
Three pull-out bolts or threaded rods with metric thread
(dD) long enough for the specific application; see Table 3:
Locking AssemblyTM Tightening Data.
Fig. 19: Front Thrust Ring Jams
If the front thrust ring jams, remove the three zinc-plated
screws to expose the pull-out threads (dD) of the front thrust
ring. Screw in suitable bolts or threaded rods and lightly tap in
an outward direction to release the front thrust ring. The pullout threads have only 3 to 5 effective threads; they are unsuitable for strong pulling forces and should be used only to
remove the Locking AssemblyTM.
Fig. 17: Square Drives
1/4”, 3/8”, 1/2” or 3/4” square drive
Table 3: Locking AssemblyTM Tightening Data
Tightening
Torque Screw
MA
Locking AssembliesTM
RfN 7012
Metric Series
RfN 7012-IN
Inch Series
20 x 47 to 40 x 65
1 to
42 x 75 to 65 x 95
1-5/8 to
70 x 110 to 95 x 135
2-3/4 to
100 x 145 to 160 x 210 3-15/16 to
170 x 225 to 200 x 260
6-1/2 to
220 x 285 to 260 x 325
280 x 355 to 300 x 375
320 x 405 to 340 x 425
360 x 455 to 420 x 515
440 x 545 to 1000 x 1110
1-1/2
2-9/16
3-3/4
6
7-7/8
(lb-ft)
(Nm)
Screw Size (dG)
Metric
Hex Key
Size (s)
Square
Drive Size
Pull-Out Thread
(dD) Metric
10.13
25.32
50.63
90.41
137.43
213.37
292.94
419.51
564.17
723.30
14
35
70
125
190
295
405
580
780
1000
M6
M8
M 10
M 12
M 14
M 16
M 18
M 20
M 22
M 24
5
6
8
10
12
14
14
17
17
19
1/4”
1/4”
3/8”
3/8”
1/2”
1/2”
1/2”
3/4”
3/4”
3/4”
M8
M 10
M 12
M 14
M 16
M 20
M 22
M 24
M 27
M 30
Catalog W-300-3
9
3
Ringfeder ®
Locking Assemblies TM
RfN 7013 & RfN 7013-IN
SELF-CENTERING SINGLE-TAPER DESIGN
Ringfeder ® RfN 7013 Locking AssembliesTM are a single-taper design
with a self-locking taper. The assemblies provide good self-centering
action and concentricity, as well as increased torque capacity. Integral
push-off screws for disassembly are provided. The assemblies are suitable for hubs with straight-thru bores and narrow hubs. A precentering
hub section is not required.
These assemblies are available in two types:
• Straight-thru type: RfN 7013.0
• Flange type: RfN 7013.1
Flange type units fix the hub positively against their extended flange to
prevent axial movement during tightening.
RfN 7013.0
RfN 7013.1
Applications and Design Examples
Fig. 20
Hub mounted with a RfN 7013.0
Locking AssemblyTM in a
straight-thru bore.
Fig. 23
Hub mounted with a RfN 7013.0
Locking AssemblyTM in counterbore.
10
Fig. 21: Turbine Runner
Turbine runner mounted with a Locking AssemblyTM.
Fig. 24
Hub mounted with a RfN 7013.1 Locking
AssemblyTM flange outside the hub bore.
Catalog W-300-3
Fig. 22
Hub mounted with a RfN 7013.1 Locking
AssemblyTM with countersunk flange.
Fig. 25
Typical layout for a Locking AssemblyTM installation.
3
Selection Guide
1. Determine the required shaft diameter (d) or
maximum torque (Mt ) to be transmitted:
Torque Mt = 5252 x HP (lb-ft)
RPM
3. Determine the recommended minimum hub outside
diameter (DN) for the Locking AssemblyTM selected
from the specification tables or calculate the hub
outside diameter (DN) as follows:
If combined torsional and axial loads are to be transmitted, calculate the resulting torque as
follows:
Pax x d 2
Mt res =
Mt2 +
≤ Mt cat
24
√
(
DN ≥ D x
)
Mt res = resultant torque to be transmitted
Mt
= actual or maximum torque to be
transmitted (lb-ft)
Pax
= axial load/thrust to be transmitted (lbs)
d
= shaft diameter (inches)
Mt cat = maximum transmissible torque (lb-ft) of
Locking AssemblyTM as specified
Note: For hollow shaft applications, please consult
Ringfeder Corporation.
√
YP + C3 x p’
YP - C3 x p’
YP = yield point of hub material (lbs/sq.in.)
p’ = contact pressure (lbs/sq.in.) between Locking
AssemblyTM and hub (see Tables 4 or 5).
C3 = form factor depending on hub design
(see Fig. 26, Fig. 27, or Fig. 28).
4. Determine the applicable machining tolerances for
the shaft and hub bores in Table 4 or 5. The required surface finish for shaft and hub bores is RMS 63 or better,
but surface finishes should not be RMS 8 or less.
2. Select a Locking AssemblyTM for the shaft diameter
(d) from the specification tables and verify that the
corresponding maximum transmissible torque (Mt)
meets the torque requirement.
If torque is the primary requirement, select the necessary torque (Mt) from the same specification tables
and determine the corresponding shaft diameter (d).
Ordering Example
Metric:
Inch:
Size
55 x 85
2-1/4
RfN
RfN
RfN
Series
7013.0
7013.1-IN
Note: Required peak torque should never exceed specified
transmissible torque (Mt ).
B
B
B
L2
L2
L2
DN
DN
DN
b
Fig. 26
C3 = 0.6
Hub pre-centered on shaft
B (hub width) ≥ 2 x L2, b ≥ Ltot
D
D
D
Fig. 27
C3 = 0.8
Straight-thru bore
B (hub width) ≥ 2 x L2
Fig. 28
C3 = 1
(hub width)
L2 ≤ B < 2 x L2
Ordering Example
Metric:
Inch:
Catalog W-300-3
Size
60 x 90
2-7/8
RfN
RfN
RfN
Series
7013.1
7013.1-IN
11
3
Inch Series Locking AssembliesTM RfN 7013-IN Specifications
d = nominal Locking AssemblyTM I.D.
= shaft O.D.
T1 = machining tolerances for shaft (d)
D = nominal Locking AssemblyTM O.D.
= hub counter bore I.D.
T2 = machining tolerances for counter bore (D)
Ltot, L, = width dimensions, relaxed condition
L1, L2
Mt = maximum transmissible torque
p = contact pressure between Locking AssemblyTM and shaft
p’ = contact pressure between Locking AssemblyTM and hub
bore
dG = metric socket head cap screw size
s = metric hex key size (across flats)
MA = required tightening torque per locking screw (tighten with
torque wrench)
DN = minimum hub O.D. for single-unit installation based on Y.P.
of 36,000 psi hub material (for other hub materials calculate
hub O.D. per step 3 of the Selection Guide)
Fig. 29
Ringfeder® RfN 7013.0
Locking AssemblyTM
(hub moves freely axially
during tightening).
Fig. 30
Ringfeder ® RfN
7013.1 Locking
AssemblyTM (hub
axially fixed during
tightening).
Notes
Pax = axial load (thrust capacity) =
Mt x 24 lbs (for Mt in lb-ft)
d
Mt, Pax, p, and p’ are based on a lightly oiled
installation (coefficient of friction µ = 0.12)
Table 4: Inch Series Locking AssembliesTM RfN 7013.0 & 7013.1-IN
Material: Medium Carbon Steel*
RfN
7013
Size
inches
1
1-3/16
1-1/4
1-3/8
1-7/16
1-1/2
1-5/8
1-3/4
1-7/8
1-15/16
2
2-1/8
2-3/16
2-1/4
2-3/8
2-7/16
2-1/2
2-9/16
2-3/4
2-7/8
2-15/16
3
3-3/8
3-7/16
3-1/2
3-3/4
3-15/16
4
Locking screws
DIN 912 – 12.9
Locking AssemblyTM dimensions
d
1.000
1.1875
1.250
1.375
1.4375
1.500
1.625
1.750
1.875
1.9375
2.000
2.125
2.1875
2.250
2.375
2.4375
2.500
2.5625
2.750
2.875
2.9375
3.000
3.375
3.4375
3.500
3.750
3.9375
4.000
T1
D
+0
–.0013
1.969
2.165
2.362
2.362
2.559
2.559
2.953
2.953
3.150
3.150
3.150
3.346
3.346
3.543
3.543
3.740
3.740
3.740
4.331
4.528
4.528
4.528
4.921
5.118
5.118
5.315
5.709
5.709
+0
–.0016
+0
–.0018
+0
–.0022
T2
inches
–0
+.0018
–0
+.0022
–0
+.0025
Ltot
L
1.456
1.456
1.456
1.456
1.456
1.456
1.811
1.811
1.811
1.811
1.811
1.811
1.811
1.811
1.811
1.811
1.811
1.811
2.362
2.362
2.362
2.362
2.362
2.362
2.362
2.362
2.677
2.677
1.220
1.220
1.220
1.220
1.220
1.220
1.496
1.496
1.496
1.496
1.496
1.496
1.496
1.496
1.496
1.496
1.496
1.496
1.968
1.968
1.968
1.968
1.968
1.968
1.968
1.968
2.283
2.283
L1
L2
D1
1.012
1.012
1.012
1.012
1.012
1.012
1.193
1.193
1.193
1.193
1.193
1.193
1.193
1.193
1.193
1.193
1.193
1.193
1.590
1.590
1.590
1.590
1.590
1.590
1.590
1.590
1.882
1.882
.854
.854
.854
.854
.854
.854
.996
.996
.996
.996
.996
.996
.996
.996
.996
.996
.996
.996
1.315
1.315
1.315
1.315
1.315
1.315
1.315
1.315
1.606
1.606
2.205
2.441
2.677
2.677
2.874
2.874
3.267
3.267
3.464
3.464
3.464
3.740
3.740
3.937
3.937
4.134
4.134
4.134
4.724
4.921
4.921
4.921
5.315
5.512
5.512
5.709
6.102
6.102
max.
Mt
lb-ft
1
1
1
1
1
1
1
1
2
2
2
2
3
3
3
4
5
5
5
7
7
8
323
385
531
585
620
647
234
329
426
473
521
803
856
908
014
466
530
593
680
845
929
012
434
543
644
180
957
083
p
p’
psi
40
33
38
35
33
32
43
40
38
36
35
39
38
36
34
38
37
37
34
33
32
31
32
31
31
36
27
26
170
800
560
055
495
100
870
740
070
840
690
125
005
875
935
965
990
065
770
300
590
910
430
810
240
450
300
870
15
13
15
15
13
13
19
19
17
17
17
19
19
18
18
20
20
20
18
16
16
16
18
17
17
21
16
16
070
650
070
070
935
935
055
055
915
915
915
625
625
485
485
050
050
050
200
920
920
920
345
630
630
190
210
210
1) Number of screws in type RfN 7013.0
2) The number of screws in type RfN 7013.1 is higher to compensate for increased friction when the hub is fixed
* Stainless steel upon request
12
Catalog W-300-3
1)
Qty
2)
Size
dG
5
5
6
6
6
6
6
6
6
6
6
7
7
7
7
8
8
8
7
7
7
7
8
8
8
10
10
10
7
7
9
9
10
10
9
9
9
9
9
10
10
10
10
12
12
12
10
10
10
10
12
12
12
15
15
15
M 6x20
M 6x20
M 6x20
M 6x20
M 6x20
M 6x20
M 8x25
M 8x25
M 8x25
M 8x25
M 8x25
M 8x25
M 8x25
M 8x25
M 8x25
M 8x25
M 8x25
M 8x25
M 10x35
M 10x35
M 10x35
M 10x35
M 10x35
M 10x35
M 10x35
M 10x35
M 10x35
M 10x35
s
MA
mm lb-ft
5
5
5
5
5
5
6
6
6
6
6
6
6
6
6
6
6
6
8
8
8
8
8
8
8
8
8
8
12.5
12.5
12.5
12.5
12.5
12.5
30
30
30
30
30
30
30
30
30
30
30
30
60
60
60
60
60
60
60
60
60
60
DN
inches
2.875
3.000
3.375
3.375
3.625
3.625
4.750
4.750
4.875
4.875
4.875
5.500
5.500
5.500
5.500
6.125
6.125
6.125
6.750
6.875
6.875
6.875
7.625
7.875
7.875
9.000
8.500
8.500
3
Metric RfN 7013 Specifications
Table 5: Metric Series Locking AssembliesTM RfN 7013.0 & 7013.1
Material: Medium Carbon Steel*
RfN
7013
Size
mm
20x 47
22x 47
24x 50
25x 50
28x 55
30x 55
32x 60
35x 60
38x 65
40x 65
42x 75
45x 75
48x 80
50x 80
55x 85
60x 90
65x 95
70x110
75x115
80x120
85x125
90x130
95x135
100x145
110x155
120x165
130x180
140x190
150x200
Locking screws
DIN 912 – 12.9
Locking AssemblyTM dimensions
d
.787
.866
.945
.984
1.102
1.181
1.260
1.378
1.496
1.575
1.654
1.772
1.890
1.969
2.165
2.362
2.559
2.756
2.953
3.150
3.346
3.543
3.740
3.937
4.331
4.724
5.118
5.512
5.906
T1
+0
–.0013
+0
–.0016
+0
–.0018
+0
–.0022
+0
–.0025
D
1.850
1.850
1.969
1.969
2.165
2.165
2.362
2.362
2.559
2.559
2.953
2.953
3.150
3.150
3.346
3.543
3.740
4.331
4.528
4.724
4.921
5.118
5.315
5.709
6.102
6.496
7.087
7.480
7.874
T2
inches
–0
+.0016
–0
+.0018
–0
+.0022
–0
+.0025
–0
+.0028
Ltot
L
1.456
1.456
1.456
1.456
1.456
1.456
1.456
1.456
1.456
1.456
1.811
1.811
1.811
1.811
1.811
1.811
1.811
2.362
2.362
2.362
2.362
2.362
2.362
2.677
2.677
2.677
3.031
3.031
3.031
1.220
1.220
1.220
1.220
1.220
1.220
1.220
1.220
1.220
1.220
1.496
1.496
1.496
1.496
1.496
1.496
1.496
1.968
1.968
1.968
1.968
1.968
1.968
2.283
2.283
2.283
2.560
2.560
2.560
L1
L2
D1
1.012
1.012
1.012
1.012
1.012
1.012
1.012
1.012
1.012
1.012
1.193
1.193
1.193
1.193
1.193
1.193
1.193
1.590
1.590
1.590
1.590
1.590
1.590
1.882
1.882
1.882
2.063
2.063
2.063
.854
.854
.854
.854
.854
.854
.854
.854
.854
.854
.996
.996
.996
.996
.996
.996
.996
1.315
1.315
1.315
1.315
1.315
1.315
1.606
1.606
1.606
1.787
1.787
1.787
2.086
2.086
2.205
2.205
2.441
2.441
2.667
2.667
2.874
2.874
3.267
3.267
3.464
3.464
3.740
3.937
4.134
4.724
4.921
5.118
5.315
5.512
5.709
6.102
6.496
6.890
7.480
7.874
8.267
max.
Mt
lb-ft
1
1
1
1
1
2
2
3
3
4
5
5
7
7
8
11
14
16
20
217
238
303
318
354
383
535
585
640
680
250
345
430
497
837
003
589
688
949
231
388
714
160
956
751
355
972
274
614
p
p’
psi
40
36
42
40
36
33
38
34
32
30
43
40
37
36
38
35
37
34
32
30
32
30
36
27
24
27
26
24
27
810
975
520
810
405
985
250
980
130
575
085
245
825
260
395
125
115
700
425
430
710
860
545
300
885
300
735
885
875
12
12
15
15
13
13
15
15
13
13
19
19
17
17
19
18
20
18
16
15
18
17
21
16
15
17
17
16
18
800
800
070
070
650
650
070
070
935
935
055
055
915
915
625
485
050
200
920
925
345
630
190
210
215
065
065
210
485
1)
Qty
2)
Size
dG
4
4
5
5
5
5
6
6
6
6
6
6
6
6
7
7
8
7
7
7
8
8
10
10
10
12
10
10
12
6
6
7
7
7
7
9
9
10
10
9
9
9
9
10
10
12
10
10
10
12
12
15
15
15
18
15
15
18
M 6x20
M 6x20
M 6x20
M 6x20
M 6x20
M 6x20
M 6x20
M 6x20
M 6x20
M 6x20
M 8x25
M 8x25
M 8x25
M 8x25
M 8x25
M 8x25
M 8x25
M 10x35
M 10x35
M 10x35
M 10x35
M 10x35
M 10x35
M 10x35
M 10x35
M 10x35
M 12x40
M 12x40
M 12x40
s
MA
mm lb-ft
5
5
5
5
5
5
5
5
5
5
6
6
6
6
6
6
6
8
8
8
8
8
8
8
8
8
10
10
10
12.5
12.5
12.5
12.5
12.5
12.5
12.5
12.5
12.5
12.5
30
30
30
30
30
30
30
60
60
60
60
60
60
60
60
60
105
105
105
DN
inches
2.625
2.625
2.875
2.875
3.000
3.000
3.375
3.375
3.625
3.625
4.750
4.750
4.875
4.875
5.500
5.500
6.125
6.750
6.875
6.937
7.625
7.875
9.000
8.500
8.750
9.875
10.625
11.250
12.375
1) Number of screws in type RfN 7013.0
2) The number of screws in type RfN 7013.1 is higher to compensate for increased friction when the hub is fixed
* Stainless steel upon request
Installation and Removal Instructions
Since the torque is transmitted by contact pressure and friction between the frictional surfaces, the condition of the contact surfaces and the proper tightening of the locking screws
are important.
INSTALLATION
1. Verify that all contact surfaces, including the screw
threads and screw head bearing surfaces, are clean and
lightly oiled.
Note: Do NOT use Molybdenum Disulfide, “Molykote” or
any other similar lubricants.
2. Slide the Locking AssemblyTM onto the shaft and into
the hub bore, aligning them as required.
3. Tighten the locking screws gradually in a diametrically
opposite sequence as follows:
a ) Hand-tighten 3 or 4 equally spaced locking screws
until they make contact. Align and adjust the connection.
b ) Hand-tighten and take up all remaining locking
screws.
c ) Use a torque wrench to tighten the screws further to
approximately one-half the specified torque (MA).
d ) Using the torque wrench tighten the screws to full
tightening torque (MA).
e ) Verify that the screws are completely tight by applying the specified tightening torque (MA).
REMOVAL
1. Loosen all screws several turns.
2. Remove the screw adjacent to each threaded jacking
hole and screw it into its corresponding jacking hole to
press off the outer ring. This releases the connection.
3. Remove the hub and the Locking AssemblyTMfrom the
shaft. Leave the screws in the jacking holes until you
have completely removed the Locking AssemblyTM from
the hub.
Disassemble and clean dirty undamaged Locking
AssembliesTM before re-use.
TOOLS REQUIRED FOR ASSEMBLY AND REMOVAL
a ) Standard torque wrench with either 1/4” or 3/8” square
drive and suitable torque range; see Table for specified
tightening torques (MA).
b ) Metric hexagonal bit socket (see Fig. 31: Square Drives)
for torque wrench with suitable across flats dim. (s); see
Table 3.
NOTE: DO NOT USE IMPACT WRENCH!
Catalog W-300-3
Fig. 31: Square Drives
1/4” or 3/8” square drive
13
4
Ringfeder ®
Shrink Discs®
RfN 4071, RfN 4091 & RfN 4051
Shrink Discs® are used to transmit high torques, particularly when
external clamping is advantageous and a high degree of concentricity is required. Ringfeder ® Shrink Discs® are self-contained and
ready for installation over a hub projection.
Applications Examples
Fig. 32: Apron Feeder Drive
Apron feeder drive; hydraulic power unit, Ridley
Island Coal Terminal.
Fig. 33: Gear
Gear mounted with a Shrink Disc®
on a straight side press.
Fig. 34: Clutch
Clutch of a 2,500 ton press shaft mounted
with a Shrink Disc®.
Fig. 36: Shrink Disc®
RING-flex® torsionally rigid, backlash-free couplings
use Ringfeder® Shrink Discs® to give a truly backlash-free shaft to shaft coupling.
Fig. 35: Speed Reducer
Shaft-mounted speed reducer fastened with a
Shrink Disc®.
14
Catalog W-300-3
4
Fig. 38:
Shrink Disc® on engine flywheel coupling
for diesel driven compressor.
Fig. 37:
RING-flex® coupling in automotive
plant main conveyor drive.
Fig. 40:
Diesel engine flywheel coupling.
Fig. 39:
Shrink Disc® on U-joint drive in sawmill
equipment.
Fig. 42: Rigid Flange Coupling
Fig. 43: Stepped Sleeve Coupling
Rigid Shrink Disc® stepped sleeve coupling.
Fig. 41:
Shrink Disc® on bull gear of punch press.
Catalog W-300-3
15
4
Relative Comparison of Shrink Disc ® Series
The original Shrink Discs® are available in three series:
Standard Series
RfN 4071
Heavy Duty Series
RfN 4091
Light Duty Series
RfN 4051
SHRINK
DISCS®
RfN 4051
RfN 4071
RfN 4091
LIGHT DUTY
SERIES
STANDARD
DUTY SERIES
HEAVY DUTY
SERIES
RfN 4051-SR
RfN 4071-SR
RfN 4091-SR
LIGHT DUTY
SERIES
STANDARD
DUTY SERIES
HEAVY DUTY
SERIES
SPLIT
SHRINK
DISCS®
More Design Examples
Shrink Disk
Gear
Shaftmounted
Reducer
Shaft-bearing
Driven Shaft
Fig. 44: Two Shrink Discs® in line offer 2X
the torque capacity of one.
Fig. 45: Speed Reducer
Shaft-mounted speed reducer. Illustrated stepped
shaft configuration provides 2-point contact eliminating
skewing during installation (installed position shown).
Figu
Type
Fig. 47: Adapter Flanges
Type HSDA Shrink Disc®
adapter flanges (available for
Hägglunds drives).
Fig. 46: Universal Joint Connection
16
Catalog W-300-3
4
General Engineering Information
The Maximum Transmissible Torque is a function of the shaft
diameter, the coefficient of friction (µ) and the clearance
between the shaft and hub. Torque is calculated using the
equation:
2
P x π x dW x l x µ
Mt =
24
P = contact pressure between shaft and hub (psi)
dW = shaft diameter (inches)
I = inner ring length (inches)
Coefficient of friction (µ) can vary widely depending on material
and surface finish. A well-accepted number for interference fits
that are lightly oiled is µ=0.12. This fig. is used to determine
torque capacity listed in this catalog. If shaft and hub are
assembled dry, µ=0.15 can be assumed. Tests have shown that
grease-free connections can attain coefficients greater than 0.2.
The transmissible torque is then increased proportionately.
Hub stress calculation, which determine the material requirements for the hub, are based on multi-directional stresses. The
following equation uses the “maximum distortion energy theory” to calculate the maximum combined stress in the hub.
VH =
where:
VH
XH
YH
ZH
H
√ 1/2 {(
2
XH-YH)
+ (YH-ZH)2 + (ZH-XH)2} + 3H2
Fit clearances can also affect torque capacity. Catalog values
are calculated using maximum fit clearance. See subsequent
data tables for suggested tolerance allowances. These fits will
allow easy assembly and disassembly.
If larger clearances are required, torque will be reduced proportionately. Also, hub stresses will increase and could exceed the
yield strength of the material, causing plastic deformation.
Please contact us if larger fit clearances are required.
Allowable hub O.D. tolerances and maximum radius allowed
adjacent to the Shrink Disc® are given in subsequent data
tables. Materials with a minimum yield point of 50,000 psi are
recommended. Because the hub is in compression, grey cast
irons are suitable. Other materials can be used if combined
stresses are kept below the yield point of the material. Contact
our engineering department for a complete stress analysis.
Hollow shafts do not act the same as solid shafts under compressive
radial loads. Depending on the wall thickness there will be varying
amounts of elastic deformation and consequently a reduction in torque
capacity. Our engineering department can provide complete information based on your requirements.
If combined torsional and axial loads are to be transmitted,
calculate the torque as follows:
Mt res =
= combined stress (psi)
= tangential stress (psi)
= radial stress (psi)
= axial and bending stress (psi)
= torsional shear stress (psi)
√
Mt2 +
(P 24x d)
ax
2
≤ Mt cat
Mt res = resultant torque to be transmitted (lb-ft)
Individual stress components can be determined by using the Lamé
thick wall cylinder equations. (See Fig. 48).
Mt
= actual or maximum torque to be transmitted (lb-ft)
Pax
= axial load-thrust to be transmitted (lbs)
dW
= shaft diameter (inches)
Mt cat = max. transmissible torque (lb-ft) of Shrink DiscTM
as specified in catalog
The required surface finish for both shaft and hub
projection I.D. and O.D. is RMS 125 microinches or better.
Fig. 48
Catalog W-300-3
17
4
Selection Guide
Shrink Discs®
1
Determine the shaft diameter (dw) to be used or
the maximum torque (Mt) to be transmitted.
Note: For hollow shaft applications, consult
Ringfeder Corporation.
2
Select a Shrink Disc® from the Table for required
shaft dia. (dw) and verify that the corresponding
maximum transmissible torque (Mt) meets the
torque requirement.
If torque is the primary requirement, select the
necessary torque (Mt) from the same specification
table and determine the corresponding shaft
diameter (dw).
3
Incorporate the specified dimensions of the
selected Shrink Disc® and required hub into your
design and drawing. Indicate the specified tightening torque (MA) for each locking screw on
the drawing.
4
Establish machining tolerances (TH, TW) for shaft,
hub bore and hub outer diameter from the specification tables.
Ordering Example
Example:
Size
90
RfN
RfN
Series
4071
Shrink Discs® RfN 4071 Specifications
Allow space for torque wrench
Detail A
See Detail A
and Options
Fig. 49: Shrink Disc® Layout
Shrink Disc® RfN 4071
Option 1
d
TH
dW
TW
=
=
=
=
=
Mt
D
d1
d2
=
=
=
=
Notes
nominal Shrink DiscTM I.D.
hub projection O.D.
specified tolerance for hub O.D. (d)
shaft size range (min.- max.)
total allowable diametrical clearance between shaft
and hub bore (dW)
maximum transmissible torque
Shrink DiscTM O.D.
bolt circle dia.
thrust ring I.D.
L, L1,L2, e
s
MA
d3
r
= width dimensions, relaxed condition
= head dimension across flats (mm)
= required tightening torque per locking screw
= 0.98 x d (for option 1)
= customer selectable (for option 2)
Pax
= Mt x 24 lbs (for option 2)
dW
1 Tapers and screws lubricated with Molykote Gn
Paste or equivalent.
2 For Series RfN 4071:
Sizes 24 to 200 have a thru-drilled tapped hole.
All larger sizes have a blind tapped hole.
18
Option 2
Catalog W-300-3
4
Shrink Discs® RfN 4071 Specifications, continued
Table 6: Shrink Disc® Series RfN 4071
Material: Alloy Steel*
Shaft/Hub dimensions
RfN
4071
Size
d
TH
24
.945
30
1.181
36
44
1.417
+0
1.732 –.0015
50
1.969
+0
–.0013
55
2.165
62
2.441
68
+0
2.677 –.0018
75
2.953
80
3.150
90
100
3.543
+0
3.937 –.0021
110
4.331
125
4.921
140
5.512
155
+0
6.102 –.0025
165
6.496
175
6.890
185
7.283
195
7.677
200
+0
7.874 –.0028
220
8.661
240
9.449
260
10.236
280
+0
11.024 –.0032
300
11.811
320
12.598
340
13.386
350
13.780
360
+0
14.173 –.0035
380
14.961
390
15.354
400
15.748
420
16.535
440
17.323
460
+0
18.110 –.0038
480
18.898
500
19.685
dW
inches
.625
.827
.875
1.024
1.062
1.220
1.250
1.437
1.496
1.654
1.654
1.890
1.890
2.047
1.969
2.362
2.165
2.559
2.362
2.756
2.559
2.953
2.756
3.150
2.953
3.346
3.346
3.740
3.740
4.134
4.134
4.528
4.528
4.921
4.921
5.315
5.315
5.709
5.512
6.102
5.906
6.299
6.299
6.693
6.693
7.480
7.480
8.268
8.268
9.055
9.055
9.646
9.449
10.236
9.843
10.630
10.630
11.220
11.024
11.614
11.417
12.205
11.811
12.598
12.402
12.992
12.992
13.780
13.386
14.173
14.173
14.961
14.961
15.748
15.748
16.535
TW
R1max.
max.
Mt
lb-ft
.0007
.065
1
.0013
.105
.0019
.145
.165
.185
.205
.0027
.225
.0031
.265
.285
.305
.0035
.340
.400
.0040
.360
.0044
.380
.480
.0048
Locking screws
DIN 931 - 10.9
Shrink Disc® dimensions
1
1
1
1
2
1
2
2
3
3
5
5
6
5
7
8
11
11
14
16
20
22
28
26
33
38
45
47
60
54
63
70
81
88
115
120
151
160
199
202
232
230
275
287
339
326
368
341
385
418
485
460
529
494
548
575
663
594
676
737
840
862
966
967
1073
077
184
160
273
295
465
438
660
693
018
856
387
365
770
475
323
844
914
360
393
504
348
089
638
311
966
114
064
138
826
227
653
866
766
554
192
355
731
944
114
582
434
072
136
512
066
966
208
059
152
840
344
131
862
664
296
019
800
509
027
219
341
262
597
192
774
328
840
506
379
600
864
992
256
731
208
L2
e
Wt.
lbs
Qty
Size
MA
s
mm lb-ft
D
d1
d2
I
inches
L
L1
1.97
1.417
1.024
.551
.768
.906
.315 .108
.4
6
M 5x 18
8
3
2.36
1.732
1.260
.630
.846
.984
.354 .108
.7
7
M 5x 18
8
3
2.83
2.047
1.496
.709
.925 1.083
.394 .108
.9
5
M 6x 20
10
9
3.15
2.402
1.850
.787 1.004 1.161
.433 .108
1.3
7
M 6x 20
10
9
3.54
2.756
2.087
.866 1.083 1.240
.472 .108
1.8
8
M 6x 25
10
9
3.94
2.953
2.283
.906 1.201 1.358
.512 .148
2.4
8
M 6x 25
10
9
4.33
3.386
2.598
.906 1.201 1.358
.512 .148
2.9 10
M 6x 25
10
9
4.53
3.386
2.835
.906 1.201 1.358
.512 .148
3.1 10
M 6x 25
10
9
5.43
3.937
3.110
.984 1.280 1.496
.551 .148
3.7
7
M 8x 30
13
22
5.71
3.937
3.307
.984 1.280 1.496
.551 .148
4.2
7
M 8x 30
13
22
6.10
4.488
3.701 1.181 1.535 1.752
.669 .177
7.3 10
M 8x 35
13
22
6.69
4.882
4.094 1.339 1.732 1.949
.748 .197
10.4 12
M 8x 35
13
22
7.28
5.354
4.488 1.535 1.969 2.244
.866 .217
13.0
9
M 10x 40
17
44
8.46
6.299
5.276 1.654 2.126 2.402
.906 .236
18.3 12
M 10x 40
17
44
9.06
6.890
5.748 1.811 2.382 2.697 1.024 .285
22.0 10
M 12x 45
19
74
10.43
7.559
6.496 1.969 2.539 2.854 1.102 .285
33.1 12
M 12x 50
19
74
11.42
8.268
6.890 2.205 2.795 3.189 1.220 .295
48.5
8
M 16x 55
24
185
11.81
8.661
7.283 2.205 2.795 3.198 1.220 .295
48.5
8
M 16x 55
24
185
12.99
9.291
7.677 2.795 3.386 3.780 1.496 .295
81.6 10
M 16x 65
24
185
13.78
9.685
8.268 2.795 3.386 3.780 1.496 .295
90.4 12
M 16x 65
24
185
13.78
9.685
8.268 2.795 3.386 3.780 1.496 .295
90.4 12
M 16x 65
24
185
14.57 10.630
9.055 3.465 4.094 4.488 1.850 .315
119.0 15
M 16x 80
24
185
15.94 11.614
9.764 3.622 4.291 4.803 1.929 .335
147.7 12
M 20x 80
30
362
16.93 12.638 10.551 4.055 4.724 5.236 2.126 .335
180.8 14
M 20x 90
30
362
18.11 13.622 11.339 4.488 5.276 5.787 2.362 .394
224.9 16
M 20x100 30
362
19.09 14.331 12.126 4.803 5.591 6.102 2.520 .394
260.1 18
M 20x100 30
362
20.47 15.197 12.913 4.803 5.591 6.102 2.520 .394
288.8 20
M 20x100 30
362
22.44 16.063 13.701 5.276 6.142 6.654 2.795 .433
410.1 24
M 20x110 30
362
22.83 17.008 14.094 5.512 6.378 6.890 2.874 .433
429.9 24
M 20x110 30
362
23.23 17.008 14.488 5.512 6.378 6.890 2.874 .433
449.7 24
M 20x110 30
362
25.39 18.031 15.236 5.669 6.614 7.205 2.992 .472
526.9 20
M 24x120 36
620
25.98 18.425 15.630 5.669 6.614 7.205 2.992 .472
573.2 21
M 24x120 36
620
26.77 18.898 16.024 5.669 6.614 7.205 2.992 .472
617.3 21
M 24x120 36
620
27.17 19.843 16.811 6.457 7.402 7.992 3.386 .472
696.7 24
M 24x130 36
620
29.53 20.748 17.598 6.969 7.953 8.543 3.583 .492
899.5 24
M 24x140 36
620
30.31 21.535 18.425 6.969 7.953 8.543 3.583 .492
925.9 28
M 24x140 36
620
31.50 22.441 19.213 7.402 8.386 8.976 3.780 .492 1113.3 30
M 24x140 36
620
33.46 23.228 20.000 7.402 8.386 9.055 3.780 .492 1267.6 24
M 27x150 41
922
* Stainless steel available upon request.
Additional information is available for Heavy Duty Series RfN 4091 and Light Duty Series RfN 4051.
Catalog W-300-3
19
4
Light Duty Shrink Discs® RfN 4051 Specifications
Allow space for torque wrench
d
Detail A
TH
dW
TW
=
=
=
=
=
Mt
D
d1
d2
L, L1,L2, e
Pax
=
=
=
=
=
=
See Detail A
and Options
Fig. 50: Shrink
=
Disc®
s
=
MA
=
d3
=
r
=
Notes
1. Tapers and screws lubricated with Molykote Gn Paste or
equivalent.
2. For Series RfN 4051:
Sizes 125 to 260 have a thru-drilled tapped hole.
All larger sizes have a blind tapped hole.
Option 2
Option 1
nominal Shrink Disc® I.D.
hub projection O.D.
specified tolerance for hub O.D. (d)
shaft size range (min.- max.)
total allowable diametrical clearance between shaft
and hub bore (dW)
maximum transmissible torque
Shrink Disc® O.D.
bolt circle dia.
thrust ring I.D.
width dimensions, relaxed condition
axial load (thrust capacity)
Mt x 24 lbs (for M in lb-ft)
t
d
head dimension across flats (mm)
required tightening torque per locking screw
0.98 x d (for Option 1)
to be selected by customer (for Option 2)
Table 7: Light Duty Shrink Disc® RfN 4051
Material: Alloy Steel*
Shaft/Hub dimensions
RfN
4051
Size
d
125
4.921
TH
140
5.512
155
+0
6.102 –.0025
165
6.496
175
6.890
185
7.283
195
7.677
200
+0
7.874 –.0028
220
8.661
240
9.449
260
10.236
280
+0
11.024 –.0032
300
11.811
320
12.598
340
13.386
350
13.780
360
+0
14.173 –.0035
380
14.961
390
15.354
400
15.748
420
16.535
440
17.323
460
+0
18.110 –.0038
480
18.898
500
19.685
dW
inches
3.740
4.134
4.331
4.921
5.118
5.512
5.315
5.709
5.709
6.102
6.102
6.496
6.496
6.890
6.890
7.283
7.087
7.874
7.874
8.465
8.661
9.252
9.055
9.843
9.843
10.630
10.630
11.417
11.417
12.008
11.811
12.205
11.811
12.598
12.598
12.992
12.992
13.780
13.386
14.173
13.780
14.567
14.567
15.354
15.354
16.142
16.142
16.732
16.732
17.323
TW
R1max.
.0027
.225
.0031
.0035
.300
.340
.380
.0040
.420
.0044
.460
.500
.0048
max.
Mt
lb-ft
7
10
10
15
17
21
23
28
28
33
34
39
46
53
54
62
61
77
83
99
109
127
126
153
158
188
191
225
221
248
274
295
265
306
320
344
372
425
405
461
426
483
499
562
619
689
657
712
727
786
782
179
916
121
702
390
603
398
766
930
372
830
469
476
582
327
073
448
349
207
902
605
130
421
584
088
776
706
280
571
387
040
536
104
856
459
488
595
680
738
333
128
355
051
584
656
202
522
274
282
D
d1
d2
I
L
inches
L1
L2
e
Wt.
lbs
Qty
Size
MA
s
mm lb-ft
7.28
6.220
5.079 1.535 2.008 2.283
.866 .236
13.2
8
M 10x 40
17
44
8.66
6.890
5.669 1.535 2.008 2.283
.866 .236
17.6
9
M 10x 40
17
44
9.65
7.559
6.260 1.535 2.008 2.283
.866 .236
22.0
11
M 10x 40
17
44
10.24
8.268
6.654 1.811 2.441 2.756 1.024 .315
30.9 10
M 12x 50
19
74
10.83
8.661
7.047 1.811 2.441 2.756 1.024 .315
35.3
11
M 12x 50
19
74
11.61
8.858
7.441 1.811 2.441 2.756 1.024 .315
44.1 12
M 12x 50
19
74
12.40
9.331
7.835 2.205 2.835 3.150 1.220 .315
59.5 15
M 12x 55
19
74
12.99
9.528
8.031 2.205 2.835 3.150 1.220 .315
66.1 16
M 12x 55
19
74
13.58 10.433
8.819 2.598 3.307 3.701 1.417 .354
77.2 10
M 16x 65
24
185
14.57 11.417
9.606 2.598 3.307 3.701 1.417 .354
97.0 12
M 16x 65
24
185
15.55 12.205 10.433 2.835 3.622 4.016 1.575 .354
105.8 14
M 16x 70
24
185
16.73 13.110 11.220 3.307 4.094 4.488 1.811 .394
132.3 16
M 16x 75
24
185
18.11 14.094 12.008 3.307 4.094 4.488 1.811 .394
165.3 18
M 16x 75
24
185
19.49 14.882 12.795 3.307 4.173 4.567 1.890 .433
185.2 20
M 16x 75
24
185
21.06 15.827 13.583 3.307 4.173 4.567 1.890 .433
220.5 21
M 16x 75
24
185
21.46 16.260 13.976 3.937 4.803 5.315 2.126 .433
264.6 16
M 20x 90
30
362
21.85 16.654 14.370 3.937 4.803 5.315 2.126 .433
275.6 16
M 20x 90
30
362
23.03 17.402 15.236 4.409 5.354 5.866 2.362 .472
330.7 18
M 20x100 30
362
23.43 17.795 15.630 4.409 5.354 5.866 2.362 .472
343.9 20
M 20x100 30
362
24.21 18.189 16.024 4.409 5.354 5.866 2.362 .472
374.8 21
M 20x100 30
362
24.80 19.094 16.811 4.724 5.669 6.181 2.520 .472
407.9 22
M 20x100 30
362
25.98 19.882 17.598 4.724 5.669 6.181 2.520 .472
451.9 24
M 20x100 30
362
26.97 20.748 18.425 5.197 6.220 6.732 2.795 .512
518.1 28
M 20x110 30
362
28.15 21.535 19.213 5.197 6.220 6.732 2.795 .512
562.2 28
M 20x110 30
362
29.53 22.323 20.000 5.197 6.220 6.732 2.795 .512
628.3 30
M 20x110 30
362
* Stainless steel available upon request.
20
Locking screws
DIN 931 - 10.9
Shrink Disc® dimensions
Catalog W-300-3
4
Heavy Duty Shrink Discs® RfN 4091 Specifications
Allow space for torque wrench
nominal Shrink Disc® I.D.
hub projection O.D.
TH
specified tolerance for hub O.D. (d)
dW
shaft size range (min.- max.)
TW
total allowable diametrical clearance between shaft
and hub bore (dW)
Mt
= maximum transmissible torque
D
= Shrink Disc® O.D.
d1
= bolt circle dia.
d2
= thrust ring I.D.
L, L1, L2, e = width dimensions, relaxed condition
Pax
= axial load (thrust capacity)
= Mt x 24 lbs (for Mt in lb-ft)
d
s
= head dimension across flats (mm)
MA = required tightening torque per locking screw
d3 = 0.98 x d (for Option 1)
r
= to be selected by customer (for Option 2)
Notes
1. Tapers and screws lubricated with Molykote Gn Paste or
equivalent.
2. For Series RfN 4091:
Sizes 125 to 175 have a thru-drilled tapped hole.
All larger sizes have a blind tapped hole.
d
Detail A
See Detail A
and Options
Fig. 51: Shrink Disc®
Option 2
Option 1
=
=
=
=
=
Table 8: Heavy Duty Shrink Disc® RfN 4091
Material: Alloy Steel*
Shaft/Hub dimensions
RfN
4091
Size
d
125
4.921
140
5.512
155
+0
6.102 –.0025
TH
165
6.496
175
6.890
185
7.283
195
7.677
200
+0
7.874 –.0028
220
8.661
240
9.449
260
10.236
280
+0
11.024 –.0032
300
11.811
320
12.598
340
13.386
350
13.780
360
+0
14.173 –.0035
380
14.961
390
15.354
400
15.748
420
16.535
440
17.323
460
+0
18.110 –.0038
480
18.898
500
19.685
dW
inches
3.346
3.740
3.740
4.134
4.134
4.528
4.528
4.921
4.921
5.315
5.315
5.709
5.512
6.102
5.709
6.102
6.299
6.693
6.693
7.480
7.480
8.268
8.268
9.055
9.055
9.646
9.449
10.236
9.843
10.630
10.630
11.220
11.024
11.614
11.417
12.205
11.811
12.598
12.402
12.992
12.992
13.780
13.386
14.173
14.173
14.961
14.961
15.748
15.748
16.535
TW
R1max.
.265
.0027
.300
.0031
.380
.0035
.460
.0040
.0044
.540
.0048
Locking screws
DIN 931 - 10.9
Shrink Disc® dimensions
max.
Mt
lb-ft
11
14
15
19
21
26
30
37
34
42
53
63
55
70
62
73
93
108
114
146
157
197
210
261
251
290
278
332
361
426
410
463
451
508
455
530
522
600
564
623
736
840
780
888
973
1106
1132
1 268
1 290
1 430
064
752
195
546
095
849
242
396
667
043
107
434
320
810
696
760
675
058
328
045
109
677
216
848
522
614
813
658
055
333
106
950
411
206
837
334
221
775
264
272
862
864
381
070
632
400
216
672
800
944
d2
I
inches
L
L1
L2
e
Wt.
lbs
Qty
Size
MA
s
mm lb-ft
D
d1
8.46
6.299
5.079 2.165 2.559 2.874 1.102 .197
24.3 10
M 12x 50
19
74
9.06
6.890
5.669 2.362 2.913 3.228 1.260 .276
28.7 12
M 12x 55
19
74
10.43
7.795
6.457 2.598 3.150 3.465 1.378 .276
44.1 15
M 12x 60
19
74
11.42
8.268
6.850 2.835 3.465 3.858 1.496 .315
57.3 10
M 16x 65
24
185
11.81
8.661
7.244 2.835 3.465 3.858 1.496 .315
63.9 10
M 16x 65
24
185
12.99
9.291
7.638 3.622 4.409 4.803 1.969 .394
103.6 14
M 16x 80
24
185
13.78
9.685
7.835 3.622 4.409 4.803 1.969 .394
116.8 14
M 16x 80
24
185
13.78
9.685
8.031 3.622 4.409 4.803 1.969 .394
110.2 15
M 16x 80
24
185
14.57 10.630
8.819 4.488 5.276 5.669 2.362 .394
143.3 20
M 16x 90
24
185
15.94 11.614
9.606 4.724 5.669 6.181 2.559 .472
191.8 15
M 20x100 30
362
16.93 12.638 10.433 5.354 6.299 6.811 2.835 .472
220.5 18
M 20x110 30
362
18.11 13.622 11.220 5.827 6.772 7.283 3.071 .472
291.0 21
M 20x120 30
362
19.09 14.331 12.008 5.984 6.929 7.441 3.150 .472
308.6 22
M 20x120 30
362
20.47 15.197 12.795 6.299 7.244 7.756 3.228 .472
363.8 24
M 20x130 30
362
22.44 16.535 13.583 6.929 7.874 8.465 3.622 .472
529.1 21
M 24x130 36
620
22.83 16.732 13.976 6.929 7.874 8.465 3.622 .472
544.5 21
M 24x130 36
620
23.23 17.008 14.370 7.087 8.031 8.622 3.622 .472
551.1 22
M 24x140 36
620
25.39 18.031 15.236 7.087 8.031 8.622 3.622 .472
705.5 22
M 24x140 36
620
25.98 18.425 15.630 7.402 8.346 8.937 3.780 .472
771.6 24
M 24x140 36
620
26.77 18.898 16.024 7.402 8.346 8.937 3.780 .472
815.7 24
M 24x140 36
620
27.17 19.843 16.811 8.425 9.370 9.961 4.370 .472
903.9 30
M 24x150 36
620
29.53 20.748 17.638 8.819 9.921 10.591 4.528 .551 1190.5 24
M 27x170 41
922
30.31 21.535 18.425 8.819 9.921 10.591 4.528 .551 1190.5 28
M 27x170 41
922
31.50 22.835 19.213 9.685 10.787 11.457 5.039 .551 1433.0 30
M 27x180 41
922
33.46 23.622 20.000 9.685 10.787 11.457 5.039 .551 1653.5 32
M 27x180 41
92
* Stainless steel available upon request.
Catalog W-300-3
21
4
Shrink Discs® on Large Diameter Shafts
Fig. 52: Shrink Disc®
900 RfN 4091 Shrink Disc®
mounting a flange on a
29.5” dia. shaft for the brake
unit of a larger vertical
Darius style wind generator.
Fig. 53: Hoist Clutch Spider
Gold mine hoist clutch spider
mounted on a 30.0” dia. shaft
requiring a 950 RfN 4071-SR
Split Shrink Disc®.
Extra Large Shrink Discs® RfN 4071 Specifications
Allow space for torque wrench
= nominal Shrink Disc® I.D.
= hub projection O.D.
TH
= specified tolerance for hub O.D. (d)
= shaft size range (min.- max.)
dW
TW
= total allowable diametrical clearance between shaft and
hub bore (dW)
Mt
= maximum transmissible torque
D
= Shrink Disc® O.D.
d1
= bolt circle dia.
d2
= thrust ring I.D.
L, L1,L2,e = width dimensions, relaxed condition
Pax
= axial load (thrust capacity)
= Mt x 24 lbs (for Mt in lb-ft)
d
s
= head dimension across flats (mm)
p’
= contact pressure between Locking AssemblyTM and hub
bore
MA
= required tightening torque per locking screw
d3
= 0.98 x d (for Option 1)
r
= to be selected by customer (for Option 2)
d
Figure
Shrink d
See Detail A
and Options
Fig. 54: Shrink Disc®
Shrink Disc® RfN 4071
Detail A
Note
Option 1
Tapers and screws lubricated with Molykote Gn Paste
or equivalent.
Ordering Example
Size
Example: 750
Option 2
RfN
RfN
Series
4071
Table 9: Extra Large Shrink Disc® RfN 4071
Material: Alloy Steel
Shaft/Hub dimensions
RfN
4071
Size
d
TH
dW
inches
16.929
17.717
17.717
560 22.047
+0
18.504
–.0043 18.504
590 23.228
19.291
19.685
620 24.409
20.472
20.866
660 25.984
21.654
22.047
700 27.559
+0
23.228
–.0049 23.622
750 29.528
25.197
25.197
800 31.496
26.772
26.772
850 33.465
28.346
28.346
900 35.433
+0
29.921
–.0055 29.921
950 37.402
31.496
31.496
1000 39.370
33.071
530
22
TW
R1max.
20.866
.480
.0048
.580
.0054
.675
.0060
.775
.0067
Locking screws
DIN 931 - 10.9
Shrink Disc® dimensions
max.
Mt
lb-ft
1 318
1 457
1 462
1 609
1 700
1 864
1 942
2 109
2 491
2 701
2 774
3 107
3 271
3 749
3 633
4 146
4 213
4 773
4 623
5 200
6 343
7 080
6 949
7 693
829
498
661
443
168
653
838
536
613
091
851
509
256
221
418
787
909
747
277
080
360
960
667
168
D
d1
d2
I
inches
L
L1
L2
e
Wt.
lbs
Qty
Size
MA
s
mm lb-ft
35.43 24.409 21.181 8.465
9.449 10.118 4.134 .492
1554
30
M 27x180 41
922
37.40 25.591 22.362 8.465
9.449 10.118 4.134 .492
1720
32
M 27x180 41
922
38.58 26.969 23.622 9.252 10.433 11.102 4.528 .591
1962
36
M 27x180 41
922
40.16 28.150 24.803 9.252 10.433 11.102 4.528 .591
2094
38
M 27x180 41
922
43.31 29.921 26.378 10.236 11.417 12.165 4.921 .591
2734
38
M 30x220 46 1254
47.24 31.496 27.953 10.236 11.417 12.165 4.921 .591
3351
40
M 30x220 46 1254
48.43 33.661 30.000 11.024 12.402 13.150 5.433 .689
3616
44
M 30x220 46 1254
51.57 35.630 31.969 11.024 12.402 13.150 5.433 .689
4090
46
M 30x220 46 1254
52.36 37.992 33.937 12.205 13.583 14.331 5.906 .689
4409
50
M 30x250 46 1254
55.12 39.961 35.906 12.205 13.583 14.331 5.906 .689
4850
52
M 30x250 46 1254
61.02 42.323 37.874 13.386 14.961 15.866 6.614 .787
6922
48
M 36x260 55 2028
63.78 44.291 39.843 13.386 14.961 15.866 6.614 .787
7496
50
M 36x260 55 2028
Catalog W-300-3
4
Installation and Removal Instructions
Ringfeder ® Shrink Discs®, Split Shrink Discs®, and Half Shrink Discs®
INSTALLATION
Note: Never tighten the locking screws before the shaft is
inside the hub, otherwise the hub projection may be
deformed.
A.
1.
2.
Shrink Discs® and Split Shrink Discs®
Remove the shipping spacers and screws, if any, provided for protection during shipping.
Verify the lubrication of the supplied locking screw threads,
screw head bearing area and tapers of the inner rings. If
necessary, lubricate them with a molybdenum disulfide
grease, such as Molykote Gn Paste.
a ) Standard Shrink Discs®
Slide the Shrink Disc® over the corresponding hub
projection. The hub outside diameter may be
greased.
B. Half Shrink Discs® - Type HC
(clearance holes in collar)
1. Remove the half Shrink Disc® (collar and inner ring) and
screws from the shipping container.
2. Verify the lubrication of the supplied locking screw
threads, screw head bearing area and tapers of the inner
rings. If necessary, lubricate them with a molybdenum
disulfide grease, such as Molykote Gn Paste.
3. Slide the half Shrink Disc® (collar and inner ring) over the
hub projection and position it as required. The hub outside diameter may be greased.
4. Insert the locking screws through the collar clearance
holes and screw them into the corresponding tapped
holes (see Fig. 57: Half Shrink Discs®).
5. Perform Steps A3 to A7 above.
DO NOT GREASE
Shaft Seat and Hub Bore
Shaft
Hub
Figure 46: H
Shrink Disc
Shrink Disc
Fig. 55: Shrink Disc®
b ) Split Shrink Discs®
Slide each half of the Split Shrink Disc® over the corresponding hub projection and align them as
required. The hub outside diameter may be greased.
Insert the locking screws through the collar and web
clearance holes and screw them into the opposite
collar (see Fig. 56: Split Shrink Disc®).
Web
DO NOT GREASE
Shaft Seat and Hub
Shaft
Hub
Fig. 57: Half Shrink DiscsTM
C. Half Shrink Discs® - Type HT
(threaded holes in collar)
1. Remove the half Shrink Disc® (collar and inner ring) and
screws from the shipping container.
2. Verify the lubrication of the supplied locking screw
threads, screw head bearing area and tapers of the inner
rings. If necessary, lubricate them with a molybdenum
disulfide grease, such as Molykote Gn Paste.
3. Slide the half Shrink Disc® (collar and inner ring) over the
hub projection and position it as required. The hub outside diameter may be greased.
4. Insert the locking screws through the web clearance
holes and screw them into the corresponding collar
holes (see Fig. 57: Half Shrink Discs®).
Split Shrink Disc
Note: Cast-iron webs may require hardened washers
under the fastener head. Consult Ringfeder Corporation.
Fig. 56: Split Shrink Disc®
3.
4.
5.
6.
7.
Clean and lightly oil the hub bore and shaft seat.
Insert the shaft or slide the hub into position over the
shaft.
Tighten 3 or 4 locking screws that are equally spaced
around the diameter to establish a parallel or perpendicular position of Shrink Disc® collar(s) relative to hub web or
shaft, respectively. This step properly seats the collar(s) on
the taper of the inner ring.
Using a torque wrench, tighten all locking screws gradually and in sequence all the way around (not in a diametrically opposite sequence).
Several passes may be required until all screws are
torqued to the specified tightening torque (MA).
Verify that the screws are completely tight by applying the
specified tightening torque (MA). (see page 40, table 23)
The gap between the Shrink Disc® collars or between
the Shrink Disc® collar and the hub should be even
all the way around.
5.
Perform Steps A3 to A7 above.
REMOVAL
The removal procedure is the same for all Shrink Disc® types.
1. Gradually release the locking screws all the way around.
Begin by releasing each screw only about one-quarter of a
turn to avoid jamming the collars.
Note: Do NOT remove screws completely yet. The collar
may spring off.
2.
Any rust formed around the hub must first be removed.
Once the screws are loose, remove the shaft or pull the
hub from the shaft.
REINSTALLATION
After removal of an existing component, disassemble the Shrink
Disc®. Clean and inspect all parts. Reinstall the assembly beginning with Step 2 of the applicable section procedure above.
Catalog W-300-3
23
5
Ringfeder ®
Split Shrink Discs®
RfN 4071-SR, RfN 4091-SR & RfN 4051-SR
Ringfeder® split Shrink Disc® design is a modified version of our
standard Shrink Discs® with split inner rings.
This configuration offers greater mounting versatility, allows symmetrical hub designs and permits the use of half Shrink Discs® in
many special applications, while maintaining all the characteristics
and advantages of our standard Shrink Discs®.
Applications and Design Examples
Fig. 58: Hoist Clutch Spider
Gold mine hoist clutch spider mounted
with a Split Shrink Disc®.
Fig. 61
Split Shrink Disc® RfN 4071-SR
mounted on one side of a hub,
a projection like type RfN 4071.
24
Fig. 59: Gear
Gear mounted with a Split
Shrink Disc® RfN 4071-SR. The
split Shrink Disc® becomes an
integral part of the gear and
provides symmetrical clamping.
Fig. 62: Rigid Coupling
Split Shrink Disc® rigid coupling. This complete coupling
locks onto both shafts at the
same time and releases just as
quickly. The coupling can join
dissimilar shafts, for example in
retrofit applications.
Catalog W-300-3
Fig. 60: Large Gear
Large gear mounted with Split
Shrink Disc® and extended bolts.
Fig. 63: Adaptor Flange
Split Shrink Disc® adaptor
flanges can be made to accommodate a wide variety of constraints.
5
Fig. 64: Gear
Gear fastened with a Split
Shrink Disc®.
Fig. 65: Split Shrink Disc® 125 RfN 4051 – SR
Used to mount herringbone gear on homogenizer.
Fig. 66: Split Shrink Disc® 195 RfN 4071 – SR
On carriage drive in sawmill.
Fig. 67-a
Drive coupling consisting of combination torque
limiter FC 350 and MMS 1000 coupling for people
mover at an airport. The coupling half is mounted
with a 4071 Shrink Disc®.
Fig. 67-b
Catalog W-300-3
25
5
Selection Guide
1.
Determine the shaft diameter (dw) to be used or the maximum torque (Mt) to be transmitted.
Note: For hollow shaft applications, please consult
Ringfeder Corporation.
2.
4.
Transmissible torque (Mt ) is one-half of torque specified in
tables, for Half Shrink Discs®.
Select a Shrink Disc® from the appropriate Table for the
required shaft diameter (dw). Verify that the corresponding
maximum transmissible torque (Mt) meets the torque
requirement. For half Shrink Discs®, Type HC or HT,
Consult Ringfeder Corporation for screw length and type.
Screw threads and screw head bearing area must be lubricated
with Molykote Gn Paste or the like and tightened to specified
torque (MA).
If torque is the primary requirement, select the necessary
torque (Mt) from Table and determine the corresponding
shaft diameter (dw).
3.
Establish machining tolerances (TH, TW) for the shaft, hub
bore and hub outer diameter from the specification tables
in next section.
Ordering Example
Incorporate the specified dimensions of the selected Shrink
Disc® and required hub into your design and drawing.
Indicate the specified tightening torque (MA) for each locking
screw on the drawing.
Split Shrink Disc®:
Half Shrink Disc®:
Size
140
140
RfN
RfN
RfN
Series-Type X = (?)
4071-SR
X = 2”
4071-HT
X = 2”
Split Shrink Discs ® and Half Shrink Discs ®
RfN 4071 Specifications
Type HC
(threaded holes in hub)
Allow space for torque wrench
Type HT
(clearance holes in hub)
See Detail A
Detail A
Fig. 69: Half Shrink Discs®
Fig. 68: Split Shrink Disc®
= nominal Shrink Disc® I.D.
= hub projection O.D.
TH
= specified tolerance for hub O.D. (d)
dW
= shaft size range (min.- max.)
TW
= total allowable diametrical clearance between shaft
and hub bore (dW)
Mt
= maximum transmissible torque for split Shrink Disc®
D
= Shrink Disc® O.D.
d1
= bolt circle dia.
d2
= thrust ring I.D.
W1,L2,W2,e = width dimensions, relaxed condition
s
= head dimension across flats (mm)
d
U1, U2
MA
Pax
= Mt x 24 lbs (for Mt in lb-ft)
dW
Note: If dimension X is larger than 4 x W1, Mt may be reduced.
With half Shrink Discs® only 50% of stated Mt is transmitted.
Notes for Table 10
1. Tapers and screws lubricated with Molykote Gn Paste or equivalent.
2. For Series RfN 4071: Sizes 24 to 200 have a thru-drilled tapped hole.
3. For Series RfN 4051: Sizes 125 to 260 have a thru-drilled tapped hole.
4. For Series RfN 4091: Sizes 125 to 175 have a thru-drilled tapped hole.
5. All larger sizes have a blind tapped hole.
26
= thru-bolt clearance hole(s)
(standard drill sizes expressed in decimals)
= required tightening torque per locking screw (same for
both split and half Shrink Discs®)
= axial load (thrust capacity)
Catalog W-300-3
5
RfN 4071-SR Specifications, continued
Table 10: Split Shrink Disc® RfN 4071–SR
Material: Alloy Steel*
Shrink Disc® dimensions
Shaft/Hub dimensions
RfN
4071
Size
d
24
.945
30
1.181
36
1.417
44
1.732
50
1.969
55
2.165
62
2.441
68
2.677
75
2.953
80
3.150
TH
+0
–.0013
+0
–.0015
+0
–.0018
90
3.543
100
+0
3.937 –.0021
110
4.331
125
4.921
140
5.512
155
6.102
165
6.496
175
+0
–.0025
6.890
185
7.283
195
7.677
200
+0
7.874
–.0028
8.661
220
240
9.449
260
10.236
300
+0
11.024 –.0032
11.811
320
12.598
340
13.386
350
13.780
360
280
380
+0
14.173
–.0035
14.961
390
15.354
400
15.748
420
16.535
440
17.323
460
480
+0
18.110 –.0038
18.898
500
19.685
dW
inches
.748
.827
.945
1.024
1.102
1.220
1.339
1.417
1.496
1.654
1.654
1.890
1.890
2.047
1.969
2.362
2.165
2.559
2.362
2.756
2.559
2.953
2.756
3.150
2.953
3.346
3.346
3.740
3.740
4.134
4.134
4.528
4.528
4.921
4.921
5.315
5.315
5.709
5.512
6.102
5.906
6.299
6.299
6.693
6.693
7.480
7.480
8.268
8.268
9.055
9.055
9.646
9.449
10.236
9.843
10.630
10.630
11.220
11.024
11.614
11.417
12.205
11.811
12.598
12.402
12.992
12.992
13.780
13.386
14.173
14.173
14.961
14.961
15.748
15.748
16.535
TW
.0007
R1max.
.050
1
.0013
.090
.110
.0019
.130
.0027
.190
.0031
.290
.0035
.330
.0040
.0044
.390
.0048
max.
Mt
lb-ft
1
1
1
1
2
1
2
2
3
3
5
5
6
5
7
8
11
11
14
16
20
22
28
26
33
38
45
47
60
54
63
70
81
88
115
120
151
160
199
202
232
230
275
287
339
326
368
341
385
418
485
460
529
494
548
575
663
594
676
737
840
862
966
967
1 073
125
184
221
273
325
465
524
634
693
018
856
387
365
770
475
323
844
914
360
393
504
348
089
638
311
966
114
064
138
826
227
653
866
766
554
192
355
731
944
114
582
434
072
136
512
066
966
208
059
152
840
344
131
862
664
296
019
800
509
027
219
341
262
597
192
774
328
840
506
379
600
864
992
256
731
208
Locking screws DIN 931 - 10.9
s
mm
U1
U2
inches
MA
lb-ft
M5
8
.281 .219
3
7
M5
8
.281 .219
3
.394 .108
5
M6
10 .328 .266
9
.433 .108
7
M6
10 .328 .266
9
.797
.472 .108
8
M6
10 .328 .266
9
.699
.856
.512 .148
8
M6
10 .328 .266
9
.551
.699
.856
.512 .148 10
M6
10 .328 .266
9
.551
.699
.856
.512 .148 10
M6
10 .328 .266
9
3.110
.630
.778
.994
.551 .148
7
M8
13 .406 .359
22
3.937
3.307
.630
.778
.994
.551 .148
7
M8
13 .406 .359
22
6.10
4.488
3.701
.728
.906 1.122
.669 .177 10
M8
13 .406 .359
22
6.69
4.882
4.094
.807 1.004 1.220
.748 .197 12
M8
13 .406 .359
22
7.28
5.354
4.488
.906 1.122 1.398
.866 .217
M10
17 .500 .438
44
8.46
6.299
5.276 1.024 1.260 1.535
.906 .236 12 M10
17 .500 .438
44
D
d1
d2
W
W1
inches
W2
L2
e
Qty Size
1.97
1.417
1.024
.354
.463
.600
.315 .108
6
2.36
1.732
1.260
.394
.502
.640
.354 .108
2.83
2.047
1.496
.433
.541
.699
3.15
2.402
1.850
.492
.600
.758
3.54
2.756
2.087
.531
.640
3.94
2.953
2.283
.551
4.33
3.386
2.598
4.53
3.386
2.835
5.43
3.937
5.71
9
9.06
6.890
5.748 1.102 1.388 1.703 1.024 .285 10 M12
19 .594 .531
74
10.43
7.559
6.496 1.181 1.467 1.781 1.102 .285 12 M12
19 .594 .531
74
11.42
8.268
6.890 1.299 1.594 1.988 1.220 .295
8
M16
24 .750 .719
185
11.81
8.661
7.283 1.299 1.594 1.988 1.220 .295
8
M16
24 .750 .719
185
12.99
9.291
7.677 1.594 1.890 2.283 1.496 .295 10 M16
24 .750 .719
185
13.78
9.685
8.268 1.594 1.890 2.283 1.496 .295 12 M16
24 .750 .719
185
13.78
9.685
8.268 1.594 1.890 2.283 1.496 .295 12 M16
24 .750 .719
185
14.57 10.630
9.055 2.028 2.343 2.736 1.850 .315 15 M16
24 .750 .719
185
15.94 11.614
9.764 2.106 2.441 2.953 1.929 .335 12 M20
30 .906 .875
362
16.93 12.638 10.551 2.323 2.657 3.169 2.126 .335 14 M20
30 .906 .875
362
18.11 13.622 11.339 2.579 2.972 3.484 2.362 .394 16 M20
30 .906 .875
362
19.09 14.331 12.126 2.736 3.130 3.642 2.520 .394 18 M20
30 .906 .875
362
20.47 15.197 12.913 2.736 3.130 3.642 2.520 .394 20 M20
30 .906 .875
362
22.44 16.063 13.701 2.972 3.406 3.917 2.795 .433 24 M20
30 .906 .875
362
22.83 17.008 14.094 3.091 3.524 4.035 2.874 .433 24 M20
30 .906 .875
362
23.23 17.008 14.488 3.091 3.524 4.035 2.874 .433 24 M20
30 .906 .875
362
25.39 18.031 15.236 3.169 3.642 4.232 2.992 .472 20 M24
36 1.063 1.031
620
25.98 18.425 15.630 3.169 3.642 4.232 2.992 .472 21 M24
36 1.063 1.031
620
26.77 18.898 16.024 3.169 3.642 4.232 2.992 .472 21 M24
36 1.063 1.031
620
27.17 19.843 16.811 3.720 4.193 4.783 3.386 .472 24 M24
36 1.063 1.031
620
29.53 20.748 17.598 3.976 4.469 5.059 3.583 .492 24 M24
36 1.063 1.031
620
30.31 21.535 18.425 3.976 4.469 5.059 3.583 .492 28 M24
36 1.063 1.031
620
31.50 22.441 19.213 4.193 4.685 5.276 3.780 .492 30 M24
36 1.063 1.031
620
33.46 23.228 20.000 4.193 4.685 5.354 3.780 .492 24 M27
41 1.188 1.156
922
* Stainless steel available upon request.
Catalog W-300-3
27
5
Light Duty Split Shrink Discs® RfN 4051-SR Specifications
Allow space for torque wrench
d
Type SR
1
Detail A
See Detail A
TH
dW
TW
=
=
=
=
=
Mt
D
d1
d2
Pax
=
=
=
=
=
=
Fig. 70: Split Shrink Disc®
Note: If dimension X is larger than 4xW1, Mt may be reduced.
With half Shrink Discs® only 50% of stated Mt is transmitted.
W1, W2, e
= width dimensions, relaxed condition
s
= head dim. across flats (mm)
U1, U2
= thru-bolt clearance hole(s) (standard drill sizes
expressed in decimals)
MA
= required tightening torque per locking screw
(same for both split and half Shrink Discs®)
Type HT
(clearance
holes in hub)
Type HC
(threaded
holes in hub)
nominal Shrink Disc® I.D.
hub projection O.D.
specified tolerance for hub O.D. (d)
shaft size range (min.- max.)
total allowable diametrical clearance
between shaft and hub bore (dW)
maximum transmissible torque
Shrink Disc® O.D.
bolt circle dia.
thrust ring I.D.
axial load (thrust capacity)
Mt x 24 lbs (for M in lb-ft)
t
dW
Notes
Fig. 71: Half Shrink Discs®
1. Tapers and screws lubricated with
Molykote Gn paste or equivalent.
Table 11: Light Duty Split Shrink Disc® RfN 4051–SR
Material: Alloy Steel*
Shrink Disc® dimensions
Shaft/Hub dimensions
RfN
4051
Size
d
125
4.921
TH
140
5.512
155
6.102
165
6.496
175
6.890
185
7.283
195
7.677
200
220
+0
7.874
–.0028
8.661
240
9.449
+0
–.0025
260
10.236
280
300
+0
11.024 –.0032
11.811
320
12.598
340
13.386
350
13.780
360
380
+0
14.173
–.0035
14.961
390
15.354
400
15.748
420
16.535
440
17.323
460
+0
18.110
–.0038
18.898
480
500
19.685
dW
inches
3.740
4.134
4.331
4.921
5.118
5.512
5.315
5.709
5.709
6.102
6.102
6.496
6.496
6.890
6.890
7.283
7.087
7.874
7.874
8.465
8.661
9.252
9.055
9.843
9.843
10.630
10.630
11.417
11.417
12.008
11.811
12.205
11.811
12.598
12.598
12.992
12.992
13.780
13.386
14.173
13.780
14.567
14.567
15.354
15.354
16.142
16.142
16.732
16.732
17.323
TW
R1max.
.0027
.0031
.190
.0035
.250
.0040
.0044
.330
.390
.0048
max.
Mt
lb-ft
7
10
10
15
17
21
23
28
28
33
34
39
46
53
54
62
61
77
83
99
109
127
126
153
158
188
191
225
221
248
274
295
265
306
320
344
372
425
405
461
426
483
499
562
619
689
657
712
727
786
782
179
916
121
702
390
603
398
766
930
372
830
469
476
582
327
073
448
349
207
902
605
130
421
584
088
776
706
280
571
387
040
536
104
856
459
488
595
680
738
333
128
355
051
584
656
202
522
274
282
W2
L2
e
Qty Size
d1
d2
7.28
6.220
5.079
.965 1.201 1.476
.866 .236
8
M10
17 .500 .438
44
8.66
6.890
5.669
.965 1.201 1.476
.866 .236
9
M10
17 .500 .438
44
9.65
7.559
6.260
.965 1.201 1.476
.866 .236
11
M10
17 .500 .438
44
10.24
8.268
6.654 1.102 1.417 1.732 1.024 .315 10 M12
19 .594 .531
74
10.83
8.661
7.047 1.102 1.417 1.732 1.024 .315
M12
19 .594 .531
74
11.61
8.858
7.441 1.102 1.417 1.732 1.024 .315 12 M12
19 .594 .531
74
12.40
9.331
7.835 1.299 1.614 1.929 1.220 .315 15 M12
19 .594 .531
74
12.99
9.528
8.031 1.299 1.614 1.929 1.220 .315 16 M12
19 .594 .531
74
13.58 10.433
8.819 1.496 1.850 2.244 1.417 .354 10 M16
24 .750 .719
185
14.57 11.417
9.606 1.496 1.850 2.244 1.417 .354 12 M16
24 .750 .719
185
15.55 12.205 10.433 1.713 2.067 2.461 1.575 .354 14 M16
24 .750 .719
185
16.73 13.110 11.220 1.949 2.343 2.736 1.811
.394 16 M16
24 .750 .719
185
18.11 14.094 12.008 1.949 2.343 2.736 1.811
11
s
mm
U1
U2
inches
MA
lb-ft
D
.394 18 M16
24 .750 .719
185
19.49 14.882 12.795 1.949 2.382 2.776 1.890 .433 20 M16
24 .750 .719
185
21.06 15.827 13.583 1.949 2.382 2.776 1.890 .433 21 M16
24 .750 .719
185
21.46 16.260 13.976 2.264 2.697 3.209 2.126 .433 16 M20
30 .906 .875
362
21.85 16.654 14.370 2.264 2.697 3.209 2.126 .433 16 M20
30 .906 .875
362
23.03 17.402 15.236 2.500 2.972 3.484 2.362 .472 18 M20
30 .906 .875
362
23.43 17.795 15.630 2.598 3.071 3.583 2.362 .472 20 M20
30 .906 .875
362
24.21 18.189 16.024 2.598 3.071 3.583 2.362 .472 21 M20
30 .906 .875
362
24.80 19.094 16.811 2.756 3.228 3.740 2.520 .472 22 M20
30 .906 .875
362
25.98 19.882 17.598 2.756 3.228 3.740 2.520 .472 24 M20
30 .906 .875
362
26.97 20.748 18.425 3.091 3.602 4.114 2.795 .512 28 M20
30 .906 .875
362
28.15 21.535 19.213 3.091 3.602 4.114 2.795 .512 28 M20
30 .906 .875
362
29.53 22.323 20.000 3.091 3.602 4.114 2.795 .512 30 M20
30 .906 .875
362
* Stainless steel available upon request.
28
W
W1
inches
Locking screws DIN 931 - 10.9
Catalog W-300-3
5
Heavy Duty Split Shrink Discs® RfN 4091-SR Specifications
Allow space for torque wrench
d
Type SR
1
Detail A
See Detail A
TH
dW
TW
=
=
=
=
=
Mt
D
d1
d2
Pax
=
=
=
=
=
=
Fig. 72: Split Shrink Disc®
Notes
Fig. 73: Half Shrink
nominal Shrink
I.D.
hub projection O.D.
specified tolerance for hub O.D. (d)
shaft size range (min.- max.)
total allowable diametrical clearance
between shaft and hub bore (dW)
maximum transmissible torque
Shrink Disc® O.D.
bolt circle dia.
thrust ring I.D.
axial load (thrust capacity)
Mt x 24 lbs (for M in lb-ft)
t
dW
Note: If dimension X is larger than 4xW1, Mt may be reduced.
With half Shrink DiscsTM only 50% of stated Mt is transmitted.
W1, W2, e
= width dimensions, relaxed condition
s
= head dim. across flats (mm)
U1, U2
= thru-bolt clearance hole(s) (standard drill sizes
expressed in decimals)
MA
= required tightening torque per locking screw
(same for both split and half Shrink DiscsTM)
Type HT
(clearance
holes in hub)
Type HC
(threaded
holes in hub)
Disc®
Discs®
Table 12: Heavy Duty Split Shrink Disc® RfN 4091–SR
1. Tapers and screws lubricated with
Molykote Gn paste or equivalent.
2. For Series RfN 4091:
Sizes 125 to 175 have a thru-drilled tapped hole.
3. All larger sizes have a blind tapped hole.
Material: Alloy Steel*
Shrink Disc® dimensions
Shaft/Hub dimensions
RfN
4091
Size
d
125
4.921
140
5.512
155
6.102
165
6.496
175
6.890
TH
+0
–.0025
185
7.283
195
7.677
200
+0
7.874
–.0028
8.661
220
240
9.449
260
10.236
280
300
+0
11.024 –.0032
11.811
320
12.598
340
13.386
350
13.780
360
380
+0
14.173
–.0035
14.961
390
15.354
400
15.748
420
16.535
440
17.323
460
18.110
480
18.898
500
19.685
+0
–.0038
dW
inches
3.346
3.740
3.740
4.134
4.134
4.528
4.528
4.921
4.921
5.315
5.315
5.709
5.512
6.102
5.709
6.102
6.299
6.693
6.693
7.480
7.480
8.268
8.268
9.055
9.055
9.646
9.449
10.236
9.843
10.630
10.630
11.220
11.024
11.614
11.417
12.205
11.811
12.598
12.402
12.992
12.992
13.780
13.386
14.173
14.173
14.961
14.961
15.748
15.748
16.535
TW
R1max.
.130
.0027
.190
.0031
.250
.0035
.330
.0040
.390
.0044
.490
.0048
max.
Mt
lb-ft
11
14
15
19
21
26
30
37
34
42
53
63
55
70
62
73
93
108
114
146
157
197
210
261
251
290
278
332
361
426
410
463
451
508
455
530
522
600
564
623
736
840
780
888
973
1106
1132
1 268
1 200
1 430
064
752
195
546
095
849
242
396
667
043
107
434
320
810
696
760
675
058
328
045
109
677
216
848
522
614
813
658
055
333
106
950
411
206
837
334
221
775
264
272
862
864
381
070
632
400
216
672
800
944
d2
W
W1
inches
W2
Locking screws DIN 931 - 10.9
L2
e
Qty Size
s
mm
U1
U2
inches
MA
lb-ft
D
d1
8.46
6.299
5.079 1.280 1.476 1.791 1.102 .197 10 M12
19 .594 .531
74
9.06
6.890
5.669 1.378 1.654 1.969 1.260 .276 12 M12
19 .594 .531
74
10.43
7.795
6.457 1.496 1.772 2.087 1.378 .276 15 M12
19 .594 .531
74
11.42
8.268
6.850 1.614 1.929 2.323 1.496 .315 10 M16
24 .750 .719
185
11.81
8.661
7.244 1.614 1.929 2.323 1.496 .315 10 M16
24 .750 .719
185
12.99
9.291
7.638 2.008 2.402 2.795 1.969 .394 14 M16
24 .750 .719
185
13.78
9.685
7.835 2.008 2.402 2.795 1.969 .394 14 M16
24 .750 .719
185
13.78
9.685
8.031 2.136 2.500 2.894 1.969 .394 15 M16
24 .750 .719
185
14.57 10.630
8.819 2.539 2.933 3.327 2.362 .394 20 M16
24 .750 .719
185
15.94 11.614
9.606 2.657 3.130 3.642 2.559 .472 15 M20
30 .906 .875
362
16.93 12.638 10.433 2.972 3.445 3.957 2.835 .472 18 M20
30 .906 .875
362
18.11 13.622 11.220 3.307 3.780 4.291 3.071 .472 21 M20
30 .906 .875
362
19.09 14.331 12.008 3.386 3.858 4.370 3.150 .472 22 M20
30 .906 .875
362
20.47 15.197 12.795 3.543 4.016 4.528 3.228 .472 24 M20
30 .906 .875
362
22.44 16.535 13.583 3.858 4.331 4.921 3.622 .472 21 M24
36 1.063 1.031
620
22.83 16.732 13.976 3.858 4.331 4.921 3.622 .472 21 M24
36 1.063 1.031
620
23.23 17.008 14.370 4.035 4.508 5.098 3.622 .472 22 M24
36 1.063 1.031
620
25.39 18.031 15.236 4.035 4.508 5.098 3.622 .472 22 M24
36 1.063 1.031
620
25.98 18.425 15.630 4.193 4.665 5.256 3.780 .472 24 M24
36 1.063 1.031
620
26.77 18.898 16.024 4.193 4.665 5.256 3.780 .472 24 M24
36 1.063 1.031
620
27.17 19.843 16.811 4.705 5.177 5.768 4.370 .472 30 M24
36 1.063 1.031
620
29.53 20.748 17.638 4.902 5.453 6.122 4.528 .551 24 M27
41 1.188 1.156
922
30.31 21.535 18.425 5.000 5.551 6.220 4.528 .551 28 M27
41 1.188 1.156
922
31.50 22.835 19.213 5.433 5.984 6.654 5.039 .551 30 M27
41 1.188 1.156
922
33.46 23.622 20.000 5.433 5.984 6.654 5.039 .551 32 M217
41 1.188 1.156
922
* Stainless steel available upon request.
Catalog W-300-3
29
6
Ringfeder ® Shrink Disc ®
RfN 4171
This new RfN 4171 Shrink Disc® employs a single long shallow taper
instead of opposing tapers of the traditional Ringfeder ® three-piece series
(RfN 4071). Better centering and concentricity result, making the shrink
disc especially suitable for high-speed applications where balance is critical.
Installation is also simplified. When the fasteners are properly torqued, the
installer has a visual aid to indicate correct installation; i.e., the inner ring
face should be flush with the outer ring face. Always use a torque wrench
to properly tighten screws.
Two-Piece Type 4171 Specifications
= nominal Shrink Disc® I.D.
= hub projection O.D.
TH
= specified tolerance for hub O.D. (d)
dW
= shaft size range (min.-max.)
TW
= total allowable diametrical clearance between shaft and hub bore (dW)
Mt
= maximum transmissible torque
D
= Shrink Disc® O.D.
d1
= bolt circle dia.
L, L1, I, e = width dimensions, relaxed condition
MA
= required tightening torque per locking screw
Pax
= axial capacity
= Mt x 24 lbs (for M lb-ft)
d
t
dW
Fig. 74: Installation Dimensions
Table 13: Two-Piece Shrink Disc® RfN 4171
Material: Alloy Steel
24
0.945
30
1.181
36
1.417
44
1.732
50
1.969
55
2.165
62
2.441
68
2.677
75
2.953
80
3.150
90
3.543
100
30
d
3.937
TH
inches
+0
–.0013
+0
–.0015
+0
–.0018
+0
–.0021
shaft
range
dW
0.748
0.827
0.945
1.024
1.102
1.220
1.339
1.417
1.496
1.654
1.654
1.890
1.890
2.047
1.969
2.362
2.165
2.559
2.362
2.756
2.559
2.953
2.756
3.150
Locking Screws
DIN 931 - 10.9
Shrink Disc® dimensions
Shaft/Hub dimensions
RfN
4171
size
TW
.0010
.0020
.0023
Mt
lb-ft
136
180
288
353
483
584
535
634
907
1 180
1 124
1 604
1 315
1 595
1 447
2 287
2 268
3 437
2 561
3 754
3 574
5 112
4 595
6 417
I
e
d1
Qty.
Size
MA
lb-ft
Weight
lbs
0.709
0.630
0.079
1.417
4
M6
9
0.4
0.787
0.709
0.079
1.732
6
M6
9
0.7
1.102
0.866
0.787
0.079
2.047
5
M8
22
1.0
3.15
1.181
0.945
0.866
0.079
2.402
5
M8
22
1.2
3.54
1.260
1.024
0.945
0.118
2.677
7
M8
22
1.7
3.94
1.378
1.142
1.024
0.118
2.835
8
M8
22
2.5
4.33
1.378
1.142
1.024
0.118
3.150
8
M8
22
2.9
4.53
1.378
1.142
1.024
0.118
3.386
9
M8
22
3.0
5.43
1.496
1.220
1.063
0.157
3.937
8
M 10
44
4.9
5.71
1.496
1.220
1.063
0.157
4.094
8
M 10
44
5.3
6.10
1.772
1.496
1.339
0.157
4.488
10
M 10
44
7.3
6.69
1.969
1.693
1.535
0.157
4.882
12
M 10
44
9.9
D
L1
L
1.97
0.866
2.36
0.945
2.83
inches
Catalog W-300-3
6
Two-Piece Type 4171 Specifications, continued
Table 14: Two-Piece Shrink Disc® RfN 4171
Material: Alloy Steel
RfN
4171
size
d
110
4.331
125
4.921
140
5.512
155
6.102
165
6.496
175
6.890
185
7.283
200
7.784
220
8.661
240
9.449
260
10.236
280
11.024
300
11.811
320
12.598
340
13.386
360
14.173
380
14.961
390
15.354
400
15.748
420
16.535
440
TH
inches
+0
–.0021
+0
–.0025
+0
–.0028
+0
–.0032
+0
–.0035
17.323
460
18.110
480
18.898
500
19.685
+0
–.0038
shaft
range
dW
3.150
3.543
3.543
3.937
3.937
4.331
4.331
4.724
4.724
5.118
5.118
5.512
5.512
5.906
5.906
6.299
6.299
6.693
6.693
7.480
7.480
8.268
8.268
9.055
9.055
9.646
9.449
10.236
10.039
10.630
11.024
11.811
11.811
12.402
12.205
12.598
12.402
12.795
12.795
13.189
12.992
13.780
13.780
14.764
14.764
15.748
15.748
16.535
Locking Screws
DIN 931 - 10.9
Shrink Disc® dimensions
Shaft/Hub dimensions
Mt
lb ft
TW
.0027
.0031
.0035
.0040
.0044
.0048
6 594
8 639
8 925
11 580
11 359
14 014
15 490
19 178
19 915
23 603
27 291
32 454
36 511
43 150
44 994
52 738
72 285
82 611
84 824
107 690
118 016
147 520
143 094
176 286
206 528
236 770
221 280
263 323
263 323
298 728
331 920
387 240
354 048
396 829
371 013
396 829
418 957
446 248
442 560
473 539
499 355
569 427
562 051
638 024
678 592
764 154
775 955
861 517
D
L1
L
I
e
d1
Qty.
Size
MA
lb ft
inches
Weight
lbs
7.28
2.244
1.929
1.732
0.197
5.354
10
M 12
74
13.5
8.46
2.402
2.087
1.890
0.236
6.299
12
M 12
74
19.8
9.06
2.638
2.283
2.047
0.236
6.811
10
M 14
118
24.3
10.35
2.795
2.441
2.205
0.236
7.480
12
M 14
118
34.4
11.42
3.071
2.677
2.402
0.276
8.031
10
M 16
184
48.5
11.81
3.071
2.677
2.362
0.315
8.425
12
M 16
184
50.7
12.99
3.740
3.346
3.031
0.315
8.819
14
M 16
184
79.4
13.78
3.740
3.346
3.031
0.315
9.449
16
M 16
184
88.2
14.57
4.567
4.055
3.701
0.354
10.630
16
M 20
361
116.9
15.94
4.724
4.213
3.819
0.394
11.654
18
M 20
361
145.5
16.93
5.197
4.685
4.291
0.394
12.521
21
M 20
361
178.6
18.11
5.709
5.197
4.803
0.394
13.386
22
M 20
361
224.9
19.09
6.102
5.512
5.118
0.394
14.173
20
M 24
620
260.2
20.47
6.102
5.512
5.118
0.394
14.961
21
M 24
620
302.1
22.05
6.693
6.102
5.630
0.472
15.827
22
M 24
620
392.5
23.23
6.850
6.260
5.787
0.472
16.693
24
M 24
620
445.4
25.00
7.087
6.417
5.866
0.551
17.638
18
M 27
922
765.1
25.00
7.087
6.417
5.866
0.551
18.031
18
M 27
922
529.2
25.59
7.480
6.811
6.260
0.551
18.701
20
M 27
922
575.3
26.38
7.874
7.205
6.614
0.591
19.488
21
M 27
922
648.3
28.35
8.268
7.598
7.008
0.591
20.394
24
M 27
922
811.4
30.31
8.268
7.598
7.008
0.591
21.181
25
M 27
922
948.2
31.50
9.055
8.386
7.795
0.591
21.969
27
M 27
922
1133.4
33.46
9.055
8.386
7.795
0.591
22.835
28
M 27
922
1301.0
Light Duty and Heavy Duty available upon request.
Catalog W-300-3
31
7
RfC Low Inertia Series Shrink Discs ®
Sizes 10 to 50
These low inertia units are designed for applications where maximum clamping is needed and minimum weight is desired. These Shrink Discs® offer the
flexibility of the standard RfN 4071 units for smaller shaft sizes. Available for
shafts from 1/4 to 1-11/16 inches. Special sizes and material on request.
Low Inertia Series Shrink Discs ® Specifications
d
TH
dW
TW
R1max
Mt
D
d1
d2
L, L1, e
L2
AF
MA
s
Detail A
Fig. 75: Low Inertia Shrink Disc®
nominal Shrink Disc® I.D.
hub projection O.D.
specified tolerance for hub O.D. (d)
nominal shaft and bore dimension
total allowable diametrical clearance between shaft and
hub bore (dW)
= maximum transmissible torque
= Shrink Disc® O.D.
= bolt circle dia.
= thrust ring I.D.
= width dimensions, relaxed condition
= thickness of thrust ring
= distance across flats
= required tightening torque per locking screw
= head dimension across flats (mm)
=
=
=
=
=
Fig. 76: Rear Thrust Collar
Table 15: RfC Low Inertia Series RfC 4051
Material: Alloy Steel*
Size
d
inches
TH
mm
dW
6
6.35
8
9
+0
13 RFC 4073 0.512 –.001
9.5
11
12
16 RFC 4051 0.630
12.7
14
16
24 RFC 4051 0.945
19
+0
20
–.0013 22.2
30 RFC 4051 1.181
24
26
27
36 RFC 4051 1.417
28
28.6
32
+0
34
44 RFC 4051 1.732 –.0015 34.93
37
38
50 RFC 4051 1.969
41.28
42.85
10 RFC 4073 0.394
inches
.236
.250
.315
.354
.375
.433
.472
.500
.551
.630
.748
.787
.875
.945
1.024
1.063
1.102
1.125
1.260
1.339
1.375
1.457
1.496
1.625
1.687
TW
R1
max.
Mt
lb-in
0.065
36
55
144
200
250
410
460
554
730
980
500
750
900
300
800
500
130
365
690
400
900
900
400
000
000
0.0005
0.0007
0.0010
0.0013
1
1
1
2
2
3
4
4
5
5
5
6
6
8
9
D
d1
d2
I
inches
L
L1
L2
e
AF Qty.
Size
s
mm
MA
lb-in
1.18
0.866 0.472 0.394 .472
.582 0.197 0.039 1.06
4
M4x10
7
12
1.30
0.985 0.591 0.394 .472
.610 0.197 0.039 1.25
4
M5x10
8
25
1.50
1.102 0.709 0.394 .551
.689 0.217 0.079 1.44
4
M5x12
8
25
1.875 1.417 1.024 0.394 .610
.748 0.236 0.108 1.75
6
M5x14
8
30
2.10
1.732 1.260 0.472 .689
.827 0.276 0.108 2.05
7
M5x16
8
30
2.50
2.047 1.496 0.551 .768
.925 0.315 0.108 2.44
5
M6x18 10
75
2.85
2.402 1.850 0.630 .847 1.000 0.354 0.108 2.75
6
M6x20 10
75
3.19
2.756 2.087 0.709 .925 1.083 0.394 0.108 3.00
6
M6x20 10
75
* Stainless steel available upon request.
Larger sizes are available upon request.
32
Locking Screws
DIN 933 - 10.9 HHCS
Shrink Disc® dimensions
Shaft/Hub dimensions
Catalog W-300-3
7a
Heavy Duty Shrink Disc ® 4091:
Small Sizes
Allow space for torque wrench
Detail
Fig. 77
d
TH
dW
TW
Mt
D
nominal Shrink Disc® I.D.
hub projection O.D.
specified tolerance for hub O.D. (d)
shaft size range (min.–max.)
total allowable diametrical clearance
between shaft and hub bore (dW)
= maximum transmissible torque
= Shrink Disc® O.D.
=
=
=
=
=
d1
d2
L, L1, e
s
MA
d3
r
=
=
=
=
=
=
=
bolt circle dia.
thrust ring I.D.
width dimensions, relaxed condition
head dimension across flats (mm)
required tightening torque per locking screw
0.98 x d (for OPTION 1)
to be selected by customer (for OPTION 2)
Mt x 24 lbs (for M in lb-ft)
=
t
dw
Pax
Table 16: Heavy Duty Shrink Disc® RfN 4091
Material: Alloy Steel*
RfC
4091
Size
d
40
1.575
44
1.732
50
1.969
55
2.165
62
2.441
68
2.677
75
2.953
80
3.150
90
3.543
100
3.937
110
4.331
TH
dW
inches
+0/-0.0015
+0/-0.0018
+0/-0.0021
1.18
1.34
1.34
1.42
1.50
1.65
1.65
1.89
1.89
2.05
1.97
2.36
2.17
2.56
2.36
2.76
2.56
2.95
2.786
3.15
2.95
3.35
TW
Locking screws
DIN 931 - 10.9
Shrink Disc® dimensions
Shaft/Hub dimensions
R1max.
0.065
0.0016
0.105
0.0019
0.145
0.165
0.185
Mt
lb-ft
1
1
1
2
1
2
2
2
2
3
3
5
4
6
4
7
6
8
8
10
693
994
070
254
600
070
783
509
176
655
360
835
319
163
204
196
942
081
491
998
113
842
D
d1
d2
3.15
2.441
1.730
3.35
2.598
3.74
I
inches
L
L1
e
0.984 1.260
1.477
1.890
1.102 1.339
2.874
2.126
4.13
3.071
4.53
3.346
4.72
s
MA
Qty
Size
0.14
4
M8x30
13
22
1.556
0.10
5
M8x30
13
22
1.181 1.535
1.752
0.18
7
M8x35
13
22
2.323
1.181 1.535
1.752
0.18
7
M8x35
13
22
2.598
1.181 1.535
1.752
0.18
7
M8x35
13
22
3.622
2.835
1.181 1.535
1.752
0.18
8
M8x35
13
22
5.71
4.134
3.307
1.417 1.811
2.086
0.20
7
M10x40
17
44
5.71
4.134
3.307
1.417 1.811
2.086
0.20
7
M10x40
17
44
6.30
4.567
3.701
1.575 1.969
2.244
0.20
8
M10x40
17
44
6.69
4.961
4.094
1.732 2.126
2.401
0.20
10
M10x45
17
44
7.28
5.433
4.488
1.969 2.362
2.637
0.20
12
M10x45
17
44
(mm) lb-ft
* Stainless steel available upon request.
Catalog W-300-3
33
8
Ringfeder ®
Locking ElementsTM
RfN 8006/GSA
For many years Ringfeder® Locking ElementsTM have been used
successfully in numerous installations and applications in all fields
of mechanical engineering, especially with smaller shaft diameters
and for lower torque requirements. By varying clamp force, the
number of Locking ElementsTM and their arrangement, different
configurations can be accommodated.
GSA Locking ElementsTM are ideal for fastening gears, pulleys,
sprockets, cams, etc., to shafts 1/4” to 3” diameter in data processing equipment, computer peripherals, copiers, and other applications where timing and backlash-free connections are required.
RfN 8006
Type GSA
Design Examples
Fig. 78
Hub-bolted clamp flange (hub axially adjustable)
Fig. 80
Hub-bolted Locking ElementTM connection.
A spacer sleeve between the locking
elements provides wider support.
Fig. 79
Shaft-bolted clamp flange (hub axially fixed).
Fig. 81
Hub-bolted Locking ElementTM connection.
The hub is mounted with two RfN 8006 locking elements in series. The clamp ring is
accommodated in the recessed hub.
Fig. 83
Shaft-bolted Locking ElementTM connection.
The hub is mounted using two RfN 8006
Locking ElementsTM.
Fig. 82
Hub-bolted Locking ElementTM connection,
double clamped. Here, four RfN 8006 Locking
ElementsTM can transmit approximately 300%.
Fig. 84
Shaft-bolted Locking ElementTM connection. The hub
is mounted with one RfN 8006 Locking ElementTM.
34
Fig. 85
Hub-bolted Locking ElementTM connection. The hub is
mounted with one RfN 8006 Locking ElementTM. Here, the
locking screws can be tightened from the left or the right.
Catalog W-300-3
8
Selection Guide
Note: Slit and solid Locking ElementsTM are available. Slit elements can be expanded or contracted from the nearest listed
metric size to accommodate many common inch-size shafts.
Solid elements must be used with metric shaft sizes and are
generally applied when frequent locking and releasing is required.
1. Determine the shaft diameter (d) to be used or the maximum
transmissible torque (Mt):
5252 x HP
Torque Mt =
(lb-ft)
RPM
If combined torsional and axial loads are to be transmitted,
calculate the torque as follows:
Mt res =
2.
3.
4.
5.
√
Mt2 +
( P 24x d )
ax
2
≤ Mt cat
Mt res = resultant torque to be transmitted (lb-ft)
Mt
= actual or maximum torque to be
transmitted (lb-ft)
Pax
= axial load-thrust to be transmitted (lbs)
d
= shaft diameter (inches)
Mt cat = max. transmissible torque of Locking ElementTM as
specified in catalog (lb-ft)
Select a Locking ElementTM for the shaft diameter (d) from the
specification tables and verify that the corresponding maximum transmissible torque (Mt) meets the torque requirements.
Note: Required peak torque should never exceed specified
transmissible torque (Mt).
Catalog values for (Mt) are based on a contact pressure of
14,220 lbs/sq.in (10 kp/mm2 ) between the shaft and the
Locking ElementTM in a lightly oiled installation.
Higher torque capacitites can be obtained by increasing the
locking force or using 2 or more Locking ElementsTM in series.
Note: When 2 or more Locking ElementsTM are used in series,
the following transmissible torque capacities are achieved:
2 locking elements: Mt2 = Mt1 x 1.555
3 locking elements: Mt3 = Mt1 x 1.86
4 locking elements: Mt4 = Mt1 x 2.03
Determine the required locking force (PA’) from the specification tables on page 36.
Note: For slit Locking ElementsTM,(PA’) is the actual locking
force required to generate a contact pressure of 14,220 lbs/sq.in.
For solid Locking ElementsTM, in addition to (PA’), a preload
(PO) is required to bridge the clearance for the specified fit.
The required total locking force for solid Locking ElementsTM is:
PA = PO + PA’
(see the specification tables on page 36).
The locking force is normally obtained by using multiple locking screws and a clamp ring or flange.
Determine the number, size and grade of screws to be
used based on the required locking force and individual
screw clamp load (see Table 17).
required locking force (PA) or PA’
Clamp load/screw =
number of screws (z)
Determine the size of clamp ring or flange using the following
empirical equations:
a) Bolt circle diameter (dH, dS):
dH = D + 0.375 + db (inches)
dS = d – 0.375 – db (inches)
b) Thickness of clamp ring or flange (SF):
SF ≥ 1.5 x db for screw Grade 2 and 5
SF ≥ 2.0 x db for screws Grade 8
Flange material: steel with YP ≥ 45,000 lbs/sq.in
c)
6.
Recommended clearance “x” and maximum values for R are
shown in the specification tables on page 36.
Calculate the hub outside diameter (DN) using the following formula:
DN ≥ D x
√
YP + 0.8 x p’
YP – 0.8 x p’
+ db
Where: Yp = yield point of hub material (lbs/sq.in)
p’ = p x d/D (lbs/sq.in) (see page 36)
B ≥ 2x I (inches) (see Fig. 88: Tightening
Sequence)
db = bolt dia. (inches)
In applications where the locking screws are seated in the shaft,
delete db and replace 0.8 by 0.6.
See Ordering Example on page 36.
Note: Slit Locking ElementsTM have a slit approx. 0.040” wide. If
the selected Locking ElementTM must be opened up or contracted
to place it over a larger or smaller shaft, respectively, the hub bore
must be increased or decreased by the same amount in order to
maintain the specified space between the hub bore and shaft (Dd). Note the following examples:
To open up an element to 0.016” (e.g. 25 x 30 RfN 8006/Slit) for a
1” shaft, the calculations are as follows:
shaft:
0.984” + 0.016” = 1.000”
hub bore: 1.181” + 0.016” = 1.197”
To contract an element to 0.0155” (e.g. 75 x 84 Rfn 8006/Slit) for a
2-15/16” shaft, the calculations are as follows:
shaft:
2.9530” – 0.0155” = 2.9375”
hub bore: 3.3070” – 0.0155” = 3.2915”
Table 17: Clamp Load – UN Fasteners
CLAMP LOAD TABLE
S.A.E. Grade 2
S.A.E. Grade 5
S.A.E. Grade 8
Bolt Size
Load*
(lbs)
Torque
(lb-in)
Load*
(lbs)
Torque
(lb-in)
Load*
(lbs)
Torque
(lb-in)
4 - 40
4 - 48
6 - 32
6 - 40
8 - 32
8 - 36
10 - 24
10 - 32
250
275
375
420
580
610
725
825
5
6
10
12
19
20
27
31
380
420
580
640
900
940
1 120
1 285
8
9
16
18
30
31
43
49
540
600
820
920
1 260
1 320
1 580
1 800
12
13
23
25
41
43
60
68
1/4 - 20
1/4 - 28
5/16 - 18
5/16 - 24
3/8 - 16
3/8 - 24
7/16 - 14
7/16 - 20
1/2 - 13
1/2 - 20
9/16 - 12
9/16 - 18
(lbs)
1 300
1 500
2 150
2 400
3 200
3 600
4 400
4 900
5 850
6 550
7 550
8 350
(lb-ft)
5
6
11
13
20
22
30
35
50
55
70
80
(lbs)
2 000
2 300
3 350
3 700
4 950
5 600
6 800
7 550
9 050
10 200
11 600
13 000
(lb-ft)
8
10
17
19
30
35
50
55
75
85
110
120
(lbs)
2 850
3 250
4 700
5 200
6 950
7 900
9 600
10 700
12 800
14 400
16 400
18 300
(lb-ft)
12
14
24
27
45
50
70
80
105
120
115
170
* Clamp load (lbs) is equal to 75% of bolt proof load.
(Courtesy of Modulus Industrial Fasteners).
Catalog W-300-3
35
8
Locking ElementsTM RfN 8006 Specifications
Clamp Flange
Fig. 86: Hub bolted design
= nominal inner ring I.D.
= shaft O.D.
T1 = machining tolerances for shaft (d)
Tb = machining tolerances for hub bore (d)
D
= nominal outer ring O.D.
= hub counter bore I.D.
T2 = machining tolerances for hub counter bore (D)
L, I = width dimensions, relaxed condition
PO = preload to bridge specified fit clearances
PA = actual locking force to generate p = 14,220 lbs/sq.in
Mt = transmissible torque of one locking element
p
= contact pressure between inner ring and shaft
x
= recommended clearance between clamp flange and hub or shaft
R
= radius in hub outer bore
d1 = spacer sleeve I.D.
d
Fig. 87: Shaft bolted design
T3 = tolerances for spacer sleeve I.D. and O.D.
D1 = spacer sleeve O.D.
Pax = axial load capacity
M x 24 lbs (for Mt in lb-ft)
= t
d
Note: Values for (Mt) are based on a contact pressure of 14,220 psi
(10 kp/mm2) between the shaft and Locking ElementTM in a lightly
oiled installation and a coefficient of friction of µ = 0.12.
Ordering Example
Size
Solid:
25 x 30
Slit:
25 x 30
RfN
RfN
RfN
Series-Type
8006/ SOLID
8006/ SLIT
Table 18: Locking ElementsTM RfN 8006
Material: Special Spring Steel*
9
10
11
12
13
15
16
18
19
20
21
22
24
25
26
28
30
32
35
36
40
42
44
45
48
52
55
57
62
64
68
71
73
79
80
84
91
96
101
106
114
124
134
148
158
168
.236
.276
.315
.354
.394
.473
.512
.551
.591
.630
.669
.709
.748
.787
.866
.945
.984
1.102
1.181
1.260
1.378
1.417
1.4986
1.575
1.654
1.772
1.890
1.969
2.165
2.205
2.362
2.480
2.559
2.756
2.795
2.953
3.150
3.346
3.543
3.740
3.937
4.331
4.724
5.118
5.512
5.906
T1
Tb
+0
–.0004
–0
+.0006
+0
–.0004
+0
–.0005
+0
–.0006
+0
–.0018
–0
+.0007
–0
+.0008
–0
+.001
–0
+.0018
+0
–.0022
–0
+.0022
+0
–.0025
–0
+.0025
D
T2
.354
.394
.433
.473
.512
.591
.630
.709
.748
.787
.827
.866
.945
.984
1.024
1.102
1.181
1.260
1.378
1.417
1.575
1.654
1.732
1.772
1.890
2.047
2.165
2.244
2.441
2.520
2.677
2.795
2.874
3.110
3.150
3.307
3.583
3.780
3.976
4.173
4.488
4.882
5.276
5.827
6.220
6.614
–0
+.0006
–0
+.0007
–0
+.0008
–0
+.001
–0
+.0018
–0
+.0022
–0
+.0025
L
.177
.177
.177
.177
.177
.177
.177
.248
.248
.248
.248
.248
.248
.248
.248
.248
.248
.248
.248
.248
.276
.276
.276
.315
.315
.394
.394
.394
.394
.472
.472
.472
.472
.551
.551
.551
.669
.669
.669
.669
.827
.827
.827
1.102
1.102
1.102
I
.146
.146
.146
.146
.146
.146
.146
.209
.209
.209
.209
.209
.209
.209
.209
.209
.209
.209
.209
.209
.236
.236
.236
.260
.260
.339
.339
.339
.339
.409
.409
.409
.409
.480
.480
.480
.591
.591
.591
.591
.736
.736
.736
.996
.996
.996
—
—
—
1 672
1 529
1 529
1 419
2 464
2 365
2 222
2 101
2 002
2 772
2 561
1 991
1 837
2 178
1 628
1 870
1 727
2 222
2 552
2 420
3 036
3 432
6 204
5 412
5 170
4 796
6 468
6 028
5 786
5 580
6 820
6 820
7 612
10 560
10 032
9 548
9 064
13 354
14 520
13 244
21 164
19 580
18 590
1
1
1
1
2
2
3
3
3
3
3
4
4
4
5
5
6
7
8
8
9
10
14
15
16
17
21
23
24
25
31
32
34
44
47
50
53
69
76
83
122
132
141
* Stainless steel available upon request.
For larger sizes up to shaft diameters of 1000 mm (39.37”), see Catalog S86A.
36
Catalog W-300-3
713
832
946
254
386
650
793
772
970
168
366
564
762
960
356
752
950
544
940
336
832
052
514
900
340
520
400
060
600
780
320
420
300
900
340
100
660
520
380
240
740
780
600
760
000
460
Mt
(based on
p=14220 psi)
lb-ft
1.56
2.13
2.78
4.12
5.06
7.23
8.53
14.18
16.27
18.44
20.90
23.43
26.04
28.93
34.72
41.95
44.84
56.42
65.10
73.78
99.82
106.33
117.90
143.94
158.40
237.24
269.79
292.94
354.42
444.83
509.93
564.17
600.34
810.10
839.03
933.06
1 309.17
1 475.53
1 656.36
1 844.42
2 546.02
3 074.03
3 652.67
5 822.57
6 762.86
7 739.31
1
X
2
R
3
Elements inches
.08
.08
.08
.08
.08
.08
.08
.12
.12
.12
.12
.12
.12
.12
.12
.12
.12
.12
.12
.12
.12
.12
.12
.12
.12
.12
.12
.12
.12
.12
.12
.12
.12
.12
.12
.12
.16
.16
.16
.16
.16
.16
.16
.20
.20
.20
.08
.08
.08
.08
.08
.08
.08
.12
.12
.12
.12
.12
.12
.12
.12
.12
.12
.12
.12
.12
.12
.12
.12
.16
.16
.16
.16
.16
.16
.16
.16
.16
.16
.20
.20
.20
.20
.20
.20
.20
.24
.24
.24
.28
.28
.28
.12
.12
.12
.12
.12
.12
.12
.16
.16
.16
.16
.16
.16
.16
.16
.16
.16
.16
.16
.16
.16
.16
.16
.20
.20
.20
.20
.20
.20
.20
.20
.20
.20
.24
.24
.24
.24
.24
.24
.24
.28
.28
.28
.35
.35
.35
inches
.004
.004
.004
.004
.004
.004
.004
.004
.004
.004
.004
.004
.004
.004
.004
.004
.004
.004
.004
.004
.004
.004
.004
.004
.004
.008
.008
.008
.008
.008
.008
.008
.008
.012
.012
.012
.012
.012
.012
.012
.016
.016
.016
.016
.016
.016
Spacer sleeve
inches
d1
T3
D1
.240
.280
.319
.358
.398
.476
.516
.555
.594
.634
.673
.712
.756
.795
.874
.952
.992
1.110
1.189
1.268
1.386
1.425
1.504
1.583
1.661
1.779
1.897
1.976
2.173
2.212
2.370
2.488
2.567
2.768
2.807
2.964
3.161
3.358
3.555
3.752
3.949
4.342
4.736
5.134
5.527
5.921
± .001
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
d
PA’
lbs
PO
lbs
± .0015
6
7
8
9
10
12
13
14
15
16
17
18
19
20
22
24
25
28
30
32
35
36
38
40
42
45
48
50
55
56
60
63
65
70
71
75
80
85
90
95
100
110
120
130
140
150
Locking ElementTM dimensions
inches
± .002
RfN 8006
Size
dxD
mm
.350
.390
.429
.468
.508
.586
.626
.705
.744
.783
.823
.862
.937
.976
1.015
1.094
1.173
1.252
1.370
1.409
1.567
1.645
1.724
1.764
1.882
2.039
2.157
2.236
2.433
2.512
2.669
2.787
2.866
3.098
3.137
3.295
3.570
3.767
3.964
4.161
4.476
4.870
5.263
5.811
6.204
6.598
8
Clamp Plate Design Criteria
Mounting — There are two basic methods for mounting the
clamp plate:
1.
2.
Hub bolting permits axial positioning of the hub as well as
angular adjustment.
Shaft bolting requires the hub to be backed against a shoulder to support the clamping force. This method does not
allow axial adjustment.
Bolt Circle Diameter (dH or dS) — This method permits
the locking screws to be as close as possible to the
Locking ElementsTM.
Note: If a single locking screw or nut is located in the center of the
shaft it must be secured to prevent loosening.
Thickness (SF) — Thickness must be sufficient to prevent
excessive deflection under the required locking force.
Deflection will reduce the induced axial locking force on
the elements and may cause the plate to bottom out on the hub
or shaft face.
Clearance — Under full applied force, there must be an axial
clearance between the clamp plate and hub or shaft face to
prevent bottoming out. A spacer sleeve may be necessary.
The sleeve outer diameter must be smaller than the hub
counter bore by approx. 0.005”, and its inner diameter must
be larger than the shaft diameter by the same amount to
assure a clearance fit.
Hub Outside Diameter (DN) — The outside diameter of
the hub must be sized to accommodate radial contact
pressures.
Installation and Removal Instructions
Since the torque is transmitted by contact pressure and friction
between the frictional surfaces, the condition of the contact
surfaces and the proper tightening of the locking screws are
important.
d ) Spacer sleeve and clamp flange or clamp ring (both
parts should slide on easily).
e ) Carefully oil the locking screw threads and head bearing surfaces.
Note: Do NOT use Molybdenum Disulphide.
INSTALLATION
3.
Hub
Shaft
Fig. 88: Tightening Sequence
Tightening sequence for locking screws.
4.
1. Carefully clean and lightly oil the shaft, hub bore, spacer
sleeves and Locking ElementsTM.
REMOVAL
Note: Do NOT use a Molybdenum Disulphide
LUBRICANT (“MOLYKOTE” OR THE LIKE).
2.
Tighten the locking screws evenly and in several steps following the diametrically opposite sequence illustrated in
Fig. 88.
a ) Tighten the screws by hand until a slight positive contact is established. Make final alignment adjustments to
the connection.
b ) Tighten the screws to approx. one-half the specified
torque using an extended key or torque wrench.
c ) Tighten the screws to full tightening torque using a
torque wrench.
d ) Verify that the screws are fully tightened by applying
the specified torque.
Check distance x. The clamp ring should not make contact
with the face of the hub. The gap between the clamp ring
and hub face should be even all the way around.
Note: Ringfeder ® Locking ElementsTM are not self-locking.
Install the parts in the following order:
a ) Hub (the play between hub bore and shaft affects the
true running of the hub).
b ) Spacer sleeve to bridge the undercut (if needed)
c ) Outer ring/inner ring (both parts must slide on easily).
For one Locking ElementTM install the outer ring first.
Otherwise, install the inner ring first.
1.
2.
3.
Remove any accumulated contaminants from the
connection.
Loosen the locking screws in several stages following a diametrically opposite sequence.
Reduce the hub and Locking ElementsTM from the shaft. If
the Locking ElementTM is jammed, loosen it by tapping it with
a light hammer.
Catalog W-300-3
37
8
Locking ElementsTM GSA Specifications
Hub
Spacer Sleeve
Clearance
Fig. 89: Hub bolted Clamp Plate
(hub axially adjustable)
d
T1
D
T2
L, I
R
PO
PA
Fig. 90: Shaft bolted Clamp Plate
(hub axially fixed)
= transmissible torque for one Locking ElementTM based on coefficient of friction of µ = 0.15 and 10,000 psi contact pressure
(torque can be increased by up to 50%)
Pax = axial load (thrust capacity)
M x 24 lbs (for Mt lb-ft)
= t
dW
= shaft diameter
= machining tolerances for shaft (d)
= counter bore diameter
= machining tolerances for counter bore (D)
= width dimensions, relaxed condition
= radius in hub bore
= preload to bridge specified fit clearances
= actual locking force to generate Mt
Mt
Selection Guide
1.
Determine the shaft diameter to be used and the maximum
torque (T) to be transmitted.
T=
2.
3.
Determine the required locking force (PA’) from Table 19. A preload (PO) is required to bridge the clearance for the specified fits.
The total required locking force is PA = PO + PA’.
The locking force is normally obtained by using one or more
screws and a clamp plate (see Fig. 80 and Fig. 81).
4.
Refer to Table 16: Clamp Load on page 33 to determine the number, size and grade of screws needed for the required locking
force and individual screw clamp load.
required locking force (PA) of PA’
Clamp load/screw =
number of screws (z)
63,000 x HP
(inch-lbs)
RPM
Select a locking element from the specification table for the shaft
diameter. Verify that the transmissible torque (Mt) for the element
meets the torque requirement.
Note: Required peak torque should never exceed specified transmissible torque (Mt ). Higher torque capacitites can be obtained by
increasing the locking force.
Table 19: Locking ElementsTM Type GSA
Material: Aluminum Alloy*
GSA Locking ElementTM dimensions
Size
d
GSA–250
GSA–312
GSA–375
GSA–437
GSA–500
*GSA–562
GSA–625
*GSA–687
GSA–750
GSA–812
GSA–875
*GSA–937
GSA–1000
GSA–1125
GSA–1250
GSA–1375
GSA–1500
GSA–1625
GSA–1750
GSA–1875
*GSA–2000
*GSA–2250
GSA–2437
*GSA–2500
GSA–2687
*GSA–2750
*GSA–3000
.250
.3125
.375
.4375
.500
.5625
.625
.6875
.750
.8125
.875
.9375
1.000
1.125
1.250
1.375
1.500
1.625
1.750
1.875
2.000
2.250
2.437
2.500
2.687
2.750
3.000
T1
+0
–.0005
+0
–.001
+0
–.0015
+0
–.002
+0
–.003
D
inches
.375
.4375
.500
.5937
.6562
.750
.8125
.875
.9375
1.0312
1.0937
1.1875
1.250
1.406
1.531
1.687
1.812
1.968
2.125
2.250
2.406
2.656
2.843
2.906
3.093
3.156
3.406
T2
-0
+.0005
–0
+.001
–0
+.0015
–0
+.002
–0
+.003
L
I
.126
.143
.160
.176
.193
.210
.226
.243
.260
.276
.293
.310
.326
.359
.393
.426
.459
.492
.526
.559
.592
.592
.592
.592
.592
.592
.592
.094
.112
.128
.143
.158
.174
.187
.203
.219
.234
.250
.267
.284
.312
.344
.376
.407
.437
.469
.500
.528
.528
.528
.528
.528
.528
.528
* Stainless steel available upon request.
* Delivery on request; other sizes stocked. Contact Ringfeder Corporation for additional sizes and information.
38
Catalog W-300-3
PO
lbs
1
1
1
1
1
1
2
2
2
2
2
3
3
3
3
5
4
4
4
4
3
3
580
686
673
796
944
259
231
414
413
617
611
087
090
220
240
745
030
295
585
595
365
795
430
330
035
950
890
PA’
lbs
1
1
1
2
2
3
3
4
4
5
6
8
9
11
13
15
17
19
22
24
24
26
27
29
450
670
920
196
512
872
237
670
145
637
188
790
437
620
105
750
510
390
475
675
910
400
260
885
750
370
860
Mt
lb-in
Wt.
lbs per
1000
14
26
43
65
94
132
175
230
295
370
458
561
680
840
140
510
940
450
045
730
480
670
655
000
090
470
080
.76
1.04
1.35
2.20
2.69
3.97
4.69
5.47
6.33
8.56
10.14
12.36
14.05
19.55
23.54
31.22
36.38
46.43
58.53
66.22
81.09
90.30
97.07
99.50
106.26
108.70
117.90
1
1
1
2
3
3
4
5
6
7
8
8
10
Torque Wrenches
9
Torque wrenches are an integral part of the proper installation of all Ringfeder ®
locking devices. We, therefore, offer a low profile head torque wrench specifically
suited to our products.
For controlled tightening of locking screws of Locking
AssembliesTM RINGFEDER®, we offer suitable torque
wrenches and attachments. These tools facilitate the
installation of our Locking AssembliesTM RfN 7012 particularly on straight through shafts. They can be used, of
course, also for mounting of Locking AssembliesTM
RINGFEDER® RfN 7013, 7014, 7015, Locking ElementsTM
RINGFEDER® RfN 8006 and Shrink Discs® RfN 4071,
RfN 4051 and RfN 4091.
Various accessories
are available upon
request. Call our
technical department
for assistance.
The rigid square drives SD and hex bit sockets exhibit
compact over-all dimensions and can be combined with
commercially available extensions. The SD-drives fit with
all CCM torque handles. Square drives and hex bit socket drives required for any given Locking AssemblyTM size
are listed in the following table.
Description and operation
When preset torque is reached, you hear a click and feel
the breakover. No inaccuracies are caused by dials and
indicators.
Fig. 91: Square Drives
1/4”, 3/8”, 1/2” or 3/4” square drive
Torque setting is achieved by turning the adjustable
micrometer torque handle. Every setting point is felt by
a distinct stop.
Fig. 92
Torque setting cannot accidentally change while wrench
is in use. By turning the lock screw located at the end of
the handle counter-clockwise (“Lock”), the adjustable
handle is locked. By turning it clockwise (“Unlock”), the
handle is unlocked.
Frictionless adjustment mechanism permits high torque
accuracy even after prolonged use.
Slim design and light weight for better accessibility to
fasteners and minimum operator fatigue.
Required attachments slide easily onto the dovetailed
and pin locked torque handle. For release of attachments, the spring-loaded lock pin can be easily
depressed by a pin or screw driver.
Fig. 93
Table 20: SQUARE DRIVE ENGLISH
MAX.
PART
MODEL DRIVE TORQUE
A
NUMBER NUMBER SIZE in lbs
in.
819057 SD-1/4
1/4
250 1-23/32
819058 SD-3/8
3/8
1250
1-7/8
819059 SD-1/2
1/2
2500
1-7/8
819119 SD-3/4* 3/4
4800
4-5/8
Catalog W-300-3
B
C
D
E
in.
in.
in.
in.
9/16
-3/4
3/4
-11/16
7/8
-7/8
1-1/8 -13/16
7/8 11-1/8 -13/16
1-1/2 1-13/32 1-1/2 1-
39
9
Locking Assembly TM & Shrink Disc ® Torque Wrench
Selection Charts
Table 21
Table 22
Table 23
®
Table 24
®
Table 25
®
40
Catalog W-300-3
The ABC’s of the RINGFEDER ®
Locking Devices
Adjustablility
10
Fretting / Galling
The friction-lock connection by means of locking devices is infinitely
variable and can be adjusted with a high degree of accuracy.
Axial force Fax
The axial thrust that can be transmitted by locking devices regardless of
the type of load encountered (static, increasing, alternating or impact).
Fax can be calculated by dividing the torque by the shaft radius
(Fax = 2 x t/d). In comparison with these theoretical values, substantially
higher values have been established in practical operations.
Centering action
Guiding action of the shaft in the minor bore of the hub. The clearance
between shaft and hub bore and the length of the minor bore have the
greatest effect on
True running of the mounted hub.
Damage to or destruction of shaft, hub bore or locking device
surfaces as a result of overloading followed by
Slip. Fretting can
always be avoided by correct dimensioning of the connection.
Fretting corrosion
Corrosion between the contact surfaces of ferrous metals. Even the
smallest relative movements favour and accelerate fretting corrosion;
lubricants can delay the process, but not stop it altogether. Long-term
prevention of fretting corrosion can be achieved only by designing the
connection in such a way that relative movement is impossible.
Locking screws – securing of
Screws subjected to static loads need not be secured against slackening (in some cases, lock washers, etc. can even be harmful). The
screws used in conjunction with locking devices are normally subjected to static loads only: consequently, they need not be secured
against loosening. Tightening down to the specified torque value is
quite adequate.
Molykote
Trade name of a lubricant containing molybdenum disulphide (MoS2). As
MoS2 reduces the
Coefficient of friction, it is used for frictional connections between shafts and hubs in exceptional cases only. We urgently
recommend that our advice be sought if it is intended that lubricants containing MoS2 be used in conjunction with internal locking devices.
Shrink Discs®, however, utilize MoS2 greases to lubricate tapers and fasteners to gain the mechanical advantage necessary for their proper function.
Fig. 94
Locking AssemblyTM RINGFEDER® 7012 Connection.
Principle sketch.
Notch factor ßk
Fatigue strength under alternating torsion stresses.
Clearances
Notch impact strength figure k
See appropriate tables.
Coefficient of friction µ
The catalog values apply to µ = 0.12. Surfaces of the Locking Devices,
shaft and hub bore slightly oiled.
Contact pressure p, p’ (internal devices)
p = contact pressure between inner ring and shaft
p’ = contact pressure between outer ring and hub
p and p’ – together with the
Coefficient of friction µ – determine the
frictional connection value. In order to avoid deformation in the plastic
range, the following values must obtain:
p < yield point at shaft
p’ < yield point of hub
Fatigue strength under alternating torsion stresses
The greatest variable stress component oscillating about the mean
stress zero that a specimen can resist an unlimited number of times
without fracture or inadmissable deformation is Fatigue Strength. This
value is influenced by shape and surface finish. The ratio between the
fatigue strength of the unnotched and polished specimen and the fatigue
strength of the test specimen is referred to as notch factor ßk.
ßk varies from material to material and decreases in value as the static
tensile strength value increases.
When locking devices are used, both shaft and hub retain their full
cross-sections, i.e. are not grooved. Consequently, the stress states at
the connection point are virtually identical with those of a smooth shaft,
i.e. the material is utilized by almost 100%.
Product of the
Shape factor k (governed by material configuration)
and the
Notch factor ßk (governed by material properties):
ßk – 1
k =
k – 1
Approximate values for k:
0,4 ... 0,8 – light metals and C-steels
0,6 ... 1 – heat-treatable steels
Play, freedom from
Connections with locking devices are absolutely free of play. Like other
frictional connections there is no danger of lateral oscillation.
Polar section modulus Wp
In the case of circular cross sections, Wp is defined thus:
Wp = d3 x π/16
The value of Wp is significantly reduced by keyways, grooves for Woodruff
keys, etc. When using locking devices the full cross-section of the shaft is
available (see Shape factor k).
Radial load, admissable
Internal locking devices can also absorb radial loads. It must be considered, however, that the surface pressure resulting from the radial load with
respect to the projected surface of the Locking AssemblyTM, is smaller
than the surface pressure generated by the clamping.
Catalog W-300-3
41
10
The ABC’s of Locking Devices, continued
Releasability
Slip
Locking AssembliesTM RfN 7012 and Locking Elements 8006 are not selflocking. The angle of the tapered rings is such that releasability is guaranteed even after prolonged heavy loading. Extractors are not required.
All shrink fits slip when overloading takes place.
Fretting of the
contact (slipping) surfaces is normally unavoidable. Locking AssembliesTM
subjected to high pressures per unit of area and rotating at high peripheral speeds can be completely destroyed. Under normal circumstances,
the degree and type of destruction do not indicate the cause of slipping.
Rust
Because of the relatively high pressures per unit of area, rusting cannot
take place between the effective surfaces of a locking device as well as
shaft and hub. Some locking devices have split inner and outer rings and
cannot hermetically seal the clamping point. In this case we advise to use
corrosion inhibitors, seals, etc. in order to protect the Locking
AssembliesTM (locking screws) against corrosion.
Safety
The frictional connection values given in the tables are achieved or even
exceeded if designing is correct and the connection properly made. The
theoretical values are higher. Frictional connections of all types – including shrink fits and press fits – must be designed in such a way that the
load peaks can be dependably transmitted. However, the load peaks
vary so greatly from case to case that we are unable to give any recommendations as regards specific safety factors.
locking device connections are insensitive to impact loads (see Fig. 95).
Slipping clutch
Locking devices are not suitable for use as a slipping clutch without
consulting us.
Tangential stresses
Tensile stress in the hub bore or compression stress in the bore of hollow shafts as a result of the
Contact pressures between outer locking ring and hub and/or inner locking ring and hollow shaft.
Fig. 97
Tangential stresses in shrink fits.
Temperature, influence of
Shrink fits – and thus locking device connections, too – give perfect
service as long as the contact pressure in the joint does not drop below
a certain minimum value. Consequently, contact pressure in the joint at
operating temperature must be the subject of close attention. Please
contact us for advice.
Fig. 95
Shape factor k
Torque wrench
Proportional factor covering stress conditions at bores, cross-sections
transitions, clamping points, grooves, etc. The following applies:
max
maximum stress
k = = nominal stress
n
(use smallest cross-sections and/or resistance moments when determining n ).
Standard tool indicating the tightening torque exerted on the screw
heads. All Ringfeder ® locking devices require a torque wrench for proper
installation.
True running
The relatively narrow Locking AssembliesTM RINGFEDER® RfN 7012
serve mainly to transmit high torques and axial forces. They are not selfcentering. True running of the hub/boss is thus governed by the
Centering action and the care taken during
Fitting.
Fig. 98
Pre-centering by selection of correct fit between
shaft and hub.
Fig. 96
Influence of the groove shape on shape factor k and
thus on the
Polar moment of resistance; extract
from the work of Prof. Thum.
For smooth shafts
42
k
= 1.
NOTE: DO NOT USE IMPACT WRENCH TO INSTALL
RINGFEDER® LOCKING DEVICES!
Catalog W-300-3
10
The ABC’s of Locking Devices, continued
THE BASICS OF SELECTING A
RINGFEDER® SHAFT/HUB LOCKING DEVICE
I. INTRODUCTION
1. SPROCKETS WITH ‘B’ STYLE HUBS
Selecting a Ringfeder® keyless shaft/hub locking device is not a difficult
procedure. A few very basic facts about the application must be known
and the proper device can be selected. We offer the following guidelines
for choosing the best device for the application. This is not intended as a
design manual. If technical help is desired, Ringfeder Corporation offers
free engineering assistance.
Ringfeder® shaft/hub locking devices can be divided into two major
categories; internal and external devices.
1.
Internal devices fit inside a bore or counterbore in a component and
clamp internally. Detailed descriptions can be found in the appropriate catalog sections.
2.
External devices fit over a hub projection and clamp the component
externally. Shrink Discs® in general, provide a more accurate concentricity (T.I.R. control) than internal devices. Detailed descriptions
can be found in the appropriate catalog sections.
For most applications on ‘B’ type sprockets where the length
through the bore is greater than 2 x locking device width; USE 7012
or 7013.
2. PLATE SPROCKETS
For plate sprockets make sure the plate is thick enough for the critical contact area of the locking device to be completely recessed in
the sprocket; USE 7013.
3. MULTI-STRAND SPROCKETS – HIGH TORQUES
For applications with very high torques, avoid laminated sprockets
(plate sprockets butt-welded to hubs); through hub design is
preferred; USE 7012, 7013 or Shrink Disc® .
B. MOUNTING GEARS
Gears include spur, miter, bevel, spiral, and helical gears as well as cams,
sheaves and other similarly constructed items.
1. NARROW GEARS
For gears where the LTB (length through bore) is less than 2 x Locking
AssemblyTM width, 7013’s offer better concentricity.
II. REQUIRED INFORMATION
Whether the application is new or a repair is to be made to an existing
connection, the following must be known:
* Peak torque required; include all shock loads and safety factors.
Generally the catalog torque ratings of the devices are the maximum
allowable.
* Shaft size
* Hub diameter; for internal devices hubs must have adequate wall thickness to support the forces generated by the device. The material published yield point can be inserted in the equations given in the various
catalogs. If the material is not known, and it is not cast iron, it is usually safe to assume the yield point to be 36,000 psi. Avoid grey cast iron
products without consulting us.
* Component rotational speed; if O.D. of component is turning more
than 2000 inches/second, consult us.
* Environmental conditions; ambient temperatures, moisture, etc.
Above 400 degrees F, contact us.
* Condition of the shaft; if the shaft is worn or damaged it must be
repaired so as to conform to the shaft tolerances specified by the type
of device chosen.
– one keyseat may be bridged without concern.
– for broken keys, flats or multiple keys, call us.
III. SELECTION GUIDELINES
There will be many exceptions to these guidelines and we can’t cover all
possible situations. However, based on our experience the following
generalizations can be made to offer a beginning in the selection process.
2. WIDE GEARS
For wide gears where the LTB is greater than 2 x Locking
AssemblyTM width, any internal device appropriately sized will work.
3. LARGE GEARS
For large diameter gears (bull gears) with cast iron hubs use Shrink
DiscsTM; with steel construction, Shrink Discs® are preferred, but all
devices are possible.
C. MOUNTING COUPLINGS
Couplings include many categories of flexible and rigid types. The most
common are addressed here.
1. Flexible disk-type couplings – Shrink Disc® is preferred.
2. Flexible gear or grid-type couplings – all internal devices can be used
as well as the Shrink Discs® if hub construction allows.
3. Flexible jaw-type couplings – use Shrink Discs® if hubs are cast iron;
all internal devices for steel hubs.
4. Rigid couplings – sleeve or flange type – Shrink DiscsTM are preferred
but all internal devices will work on steel hubs.
D. MOUNTING CONVEYOR PULLEYS, ROLLS AND DRUMS
Conveyor pulleys, rolls and drums present unique applications in that they
are very often subjected to high loads resulting in the shafts deflecting. This
deflection must be calculated and minimized in order for the correct device
to be selected. We, therefore, strongly suggest that you call us!
A. MOUNTING SPROCKETS
Sprockets generally use the internal devices. Sprockets include: roller
chain, conveyor chain, HTD, Polychain, etc. Check for an adequate hub
diameter for the required device. If the product is steel, assume a hub
material yield point of 36,000 psi minimum unless you know more
precisely what the material is.
Catalog W-300-3
Toll Free: 1–800–245–2580
WEB: www.ringfeder.com
43
RFC SPECIALTY PRODUCTS
RFC Specialty Locking Devices
Ringfeder Corporation excels at specialty keyless shaft/hub connection solutions. From 1/4” shafts to 30” shafts,
our engineers have the solution.
RING-flex® Single Flexing and
Double Flexing Couplings with
Ringfeder® Shrink Discs®
Assure a totally backlash-free connection with precise synchronization capability. Additional features: Clearance fits
for hub/shaft connection allow easy
assembly and free axial movement
compensation during installation which
eliminates unwanted pre-loading or prestressing of the flexible elements.
BALL DETENT TORQUE
LIMITERS Type BD
FRICTION TORQUE LIMITER
Type FC
These accurate ball/roller and socket
torque limiters are easily adjustable for
different torque settings. In the event of
an overload, personnel and equipment
are protected as these devices disconnect mechanically and make contact
with a limit switch that sounds and
alarm or otherwise shuts the drive
down. Available in various configurations and combinations with couplings.
Easily adjustable, these torque limiters
rely on friction to transmit the set torque.
When an overload occurs, these devices
slip until the overload is removed or the
machine is reset. Available in various
configurations and combinations with
couplings.
ARCUSAFLEX® Flywheel
Couplings
Multi Mont OCTA Flywheel
Couplings
Highly flexible, backlash-free, vulcanized
rubber disc couplings designed to couple the flywheel of an internal combustion engine to the shaft of the driven
machine. Rubber disc element accepts
relatively high angular, axial and parallel
misalignments. Flange dimensions
according to SAE J620 standards.
Torsionally flexible, economical flange
couplings for connecting the flywheel of
a combustion engine to the input shaft
of a driven machine. Rubber elements
dampen vibrations and accommodate
misalignments.
In accordance with our established policy to constantly improve our products, the specifications contained herein are subject to change without notice.
Since our Engineers cannot be aware of all applications and cannot control all the factors that may affect the function of our products, our warranty applies to
our products only.
TECHNICAL ASSISTANCE
Our Representative:
Call us Toll Free at 1–800–245–2580
Please let us know what your specific requirements are and
we shall be very happy to work out detailed recommendations without any obligation. Just send a sketch with your
requirements and specifications.
Call or write for more information.
Visit our website: www.ringfeder.com
RINGFEDER CORPORATION
165 Carver Avenue
P.O. Box 691
Westwood, NJ 07675
TEL (201) 666–3320 • FAX (201) 664–6053
Los Angeles Office: TEL (805) 382-9900 • FAX (805) 382-9980
© Copyright 2001
W–300-3
11/05 GP
Printed in U.S.A.
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