NEXTBACKINDEXFreewheel Clutches :CD Contents Catalogue Selection INDEX
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Snap Ring Brg*
Types PB & HT Sprag Clutches
PB Sprag Clutches feature precision formed
sprags for maximum torque capacities
combined with long life. The clutches have an
outer race designed to simply attach sprockets,
gears or pulleys with a plain bearing to
support high radial loads. They are
pre-lubricated with grease suitable for temp
range -10 to +50˚C. Oil lubricated clutches can
also be supplied to order (except PB3A).
These clutches are suitable for general purpose
overrunning and indexing applications.
7
For Spirolox
Snap Ring S
Dimensions
Model Nominal Snap Weight
No.
(1)
Torque Ring kg
Nm
(2)
S Ref
Inner Outer Bore Keyway A B C D E F G H J K L M
PB-3A 54 1800 900 47.63 50.80 19.84 21.43 20.64 23.81 12.70
1/8x1/16 RS 87 .34
PB-5A 149 1800 900 69.85 50.80 31.75 25.40 25.40 39.69 17.46
3/16x3/32 RS125 .80
PB-6A 406 1800 800 82.25 73.03 39.69 34.93 33.34 41.28 25.40
3/16x3/32 RS137 1.60
PB-8A 610 1600 650 90.48 82.55 42.86 41.28 36.51 44.45 26.99
1/4x1/8 RS175 1.70
PB-10A 915 1200 400
1/4x1/8 88.90 95.25 43.66 50.81 36.51 42.86 26.99 5/16x5/32 RS225 2.73
PB-12A 1830 1200 300 98.43 112.71 47.63 60.33 36.51 52.39 28.58
3/8x3/16 RS250 3.86
PB-14A 2169 950 300
3/8x3/16 111.13 139.70 53.98 76.20 44.45 50.80 34.93 7/16x7/32 RS285 6.69
PB-16A 2440 950 300
1/2x1/4 113.13 139.70 53.98 82.55 44.45 53.98 36.51 1/2x1/4 RS325 6.80
Max Overrun rpm Dimensions mmBore Sizes ins
(3)
.375
.500
.500
.625
1.125
1.250
.875
1.000
1.375
1.500
1.625
1.750
1.875
2.000
.750
1/8x1/16
Roll Pin
1/8x1/16
3/16x3/32
3/16x3/32
3/16x3/32
1/4x1/8
5/16x5/32
3/8x3/16
22.23
22.20
31.75
31.73
34.93
34.90
44.45
44.43
57.15
57.13
63.50
63.48
73.03
73.00
82.55
82.53
18.16
18.29
22.86
22.99
30.86
30.99
33.40
33.53
34.04
34.16
33.30
33.55
41.28
41.40
41.91
42.04
21.21
21.36
30.63
30.43
33.71
33.50
43.08
42.82
55.42
55.12
60.73
60.43
70.79
70.49
80.16
79.86
0.92
1.42
1.22
1.73
1.22
1.73
1.42
1.93
1.42
1.93
3.05
3.30
1.42
1.93
1.73
2.24
(1) When ordering specify bore size and direction.
Viewed from direction “A” clutch suffix “L” - inner race drives CCW
“R” - inner race drives CW
(2) Maximum torque for short periods 1.5x Nominal torque.
(3) Metric Bore clutches are available to order. Sizes PB5-PB16.
Bold print indicates preferred imperial sizes.
HT Sprag Clutches are designed for end of
shaft applications, being retained on the shaft
by a deep groove ball bearing with snap ring in
outer race locating in recess dia. D.
The outer race of the clutch is tapped for
attaching sprocket, gear or ratchet arm
Intended primarily for indexing applications,
the clutches can also be used for backstop and
overrun applications providing the inner race is
overrunning.
ABC D GHNo. U.N.F. Ref Bore
HT-10 57 0.3 1600 0.625
3/16x3/32 54.0 60.3 39.7 30.00/30.01 47.62 9.5 4 1/4-28 6200N 10 1.2
HT-30 597 0.5 900 69.9 114.3 52.4 71.99/72.01 95.25 11.9 6 3/8-24 5.0
1.125
1/4x1/8
HT-20 209 0.4 1200 1.250 1/4x1/8 57.9 90.5 42.9 51.99/52.01 69.85 9.5 4 5/16-24 2.3
1.312 5/16x5/32
Std Bores (ins)
Bore Keyway
Dimensions mm Tapped Holes
1.500
1.750
1.937
2.000
3/8x3/16
3/8x3/16
1/2x1/4
1/2x1/4
6306N
6207N
6304N
6205N
30
35
20
25
(1) When ordering specify bore size and direction.
Viewed from direction “A” clutch suffix “L” - inner race drives CCW
“R” - inner race drives CW
*Before installation a snap-ring ball bearing must be inserted in the
counterbored end complete with a gasket or seal to retain the lubricant.
Snap-ring ball bearing not supplied with clutch.
Always apply pressure on the inner race when installing. It is
important that the clutch fits snug on the shaft and has proper fitting
keys.
HT series clutches are lightly lubricated prior to despatch as an anti-
corrosive measure, and must be fully lubricated after the snap-ring
ball bearing has been incorporated. Use Type A automatic transmission
fluid. Fill until oil runs out between hub and end cap.
E - Number of
Equally Spaced
Tapped Holes
F - Thread Size
Usable Depth of
Thread
Model Nom Drag Max App
No.
(1)
Torque Torque Shaft Wt
Nm Nm rpm kg
