BB SERIES TOLERANCE KEYS AND KEYWAYS Machine the shaft and housing to the measurements and tolerances given in the table below. Torque is transmitted by press fit, for models without keyways. Clutch may slip if the shaft and housing are not machined to the recommended dimensions.
Tolerance for Shaft and Housing
Tolerance for Shaft and Housing
Recommended Shaft Dia. Inch (mm) 0.5910 / 0.5915 (15.012 / 15.023)
Recommended Housing Bore Dia. Inch (mm) 1.3769 / 1.3775 (34.972 / 34.988)
Recommended Shaft Dia. Inch (mm) 0.5894 / 0.5902 (14.972 / 14.992)
Recommended Housing Bore Dia. BB__K BB__GDK BB__KK
Model No.
Model No.
1.3769 / 1.3775
1.3772 / 1.3779
BB15 / BB15GD
BB15K, KK, GDK
(34.972 / 34.988) (34.982 / 34.998)
0.6698 / 0.6702
1.5737 / 1.5743
0.6682 / 0.6690
1.5737 / 1.5743
1.5741 / 1.5747
BB17 / BB17GD
BB17K, KK, GDK
(17.012 / 17.023)
(39.972 / 39.988)
(16.972 / 16.992)
(39.972 / 39.988) (39.982 / 39.998)
0.7880 / 0.7885
1.8493 / 1.8499
0.6681 / 0.6689
1.8493 / 1.8499
1.8495 / 1.8503
BB20 / BB20GD
BB20K, KK, GDK
(20.015 / 20.028)
(46.972 / 46.988)
(19.969 / 16.990)
(46.972 / 46.988) (46.978 / 46.997)
0.9848 / 0.9854
2.0459 / 2.0467
0.9830 / 0.9839
2.0459 / 2.0467
2.0464 / 2.0471
BB25 / BB25GD
BB25K, KK, GDK
(25.015 / 25.028)
(51.967 / 51.986)
(24.969 / 24.990)
(51.967 / 51.986) (51.978 / 51.997)
1.1817 / 1.1822
2.4396 / 2.4404
1.1799 / 1.1807
2.4396 / 2.4404
2.4401 / 2.4408
BB30 / BB30GD
BB30K, KK, GDK
(30.015 / 30.028)
(61.967 / 61.986)
(29.969 / 29.990)
(61.967 / 61.986) (61.978 / 61.997)
1.3786 / 1.3793
2.8333 / 2.8341
1.3765 / 1.3775
2.8333 / 2.8341
2.8337 / 2.8344
BB35 / BB35GD
BB35K, KK, GDK
(35.017 / 35.033)
(71.967 / 71.986)
(34.963 / 34.988)
(71.967 / 71.986) (71.975 / 71.994)
1.5755 / 1.5761
3.1483 / 3.1491
1.5733 / 1.5743
3.1483 / 3.1491
3.1486 / 3.1494
BB40 / BB40GD
BB40K, KK, GDK
(40.017 / 40.033)
(79.967 / 79.986)
(39.963 / 39.988)
(79.967 / 79.986) (79.975 / 79.994)
Dimensions in mm
u i b
Dimension of Keyways and Keys
b'
y r w e t q
b 1 b 2
Inner Race Key b x h x length
Outer Race Key b' x h' x length
Model
b2 t1 t2 b1 t
BB15K BB15GDK
— — —
—
B
5.0 1.9 1.2
BB15KK
—
2.0 0.6
5 x 3 x 11
2 x 2 x 11
Drawing shows BB-KK
BB17K BB17GDK
— — —
—
5.0 1.9 1.2
BB17KK
—
2.0 1.0
5 x 3 x 12
2 x 2 x 12
BB20K BB20GDK
— — —
—
6.0 2.5 1.6
BB20KK
—
3.0 1.5
6 x 4 x 14
3 x 3 x 14
A
BB25K BB25GDK
— — —
—
8.0 3.6 1.5
b 2
u i b
BB25KK
—
6.0 2.0
8 x 5 x 15
6 x 4 x 15 y r w e t q
b'
b 1 b 2
BB30K BB30GDK
— — —
—
8.0 3.1 2.0
BB30KK
—
6.0 2.0
8 x 5 x 16
6 x 4 x 16
BB35K BB35GDK
— — —
—
B
10.0 3.7 2.4
BB35KK
—
8.0 2.5
10 x 6 x 17
8 x 5 x 17
Shaft
BB40K BB40GDK
— — —
—
12.0 5.0 3.3
e - Cam cage i - Outer race key r - Ball bearing t - Shield u - Inner race key w - Outer race y - Retainer
BB40KK
—
10.0 3.0
12 x 8 x 22
10 x 6 x 22
A
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