Kerk Motion

Part Number Shaft Root Diameter Bushing Outside Bushing Length Thread Thread Length Equiv. Diameter* CAD Model

A
in.
(mm)

in.
(mm)
B
in.
(mm)
C
in.
(mm)
M
N
in.
(mm)

in.
(mm)
 
SS2**
 
.125
(3.18)
.095
(2.41)
.375
(9.53)
.500
(12.7)
3/8-24
 
.250
(6.35)
.110
(2.79)
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SS4
 
0.250
(6.35)
.202
(5.13)
0.500
(12.70)
0.75
(19.1)
7/16-20
 
0.250
(6.35)
.226
(5.74)
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SS6
 
0.375
(9.53)
.306
(7.77)
0.625
(15.88)
1.00
(25.4)
9/16-20
 
0.375
(9.53)
.341
(8.65)
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SS8
 
0.500
(12.70)
.419
(10.64)
0.813
(20.65)
1.50
(38.1)
3/4-20
 
0.500
(12.70)
.458
(11.63)
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SS12
 
.750
(19.05)
.630
(16.00)
1.125
(28.58)
2.25
(57.2)
1-16
 
.750
(19.05)
.690
(17.53)
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Maximum twist:
3˚/ft. about Spline Shaft axis.

Torsional clearance (SSB): 3˚
Bushing to shaft.

*Spline Shaft stiffness may
be modeled as a round rod
with diameters given.

**SS2 only available in
SSBP and SSBY styles.