Table 14. Selection of Shaft Tolerance Classifications for Metric Radial Ball and Roller Bearings of ABEC-1 and RBEC-1 Tolerance Classes ANSI/ABMA 7-1995 (R2001)
Ball Bearings
Cylindrical Roller Bearings
Spherical Roller Bearings
Tolerance Symbol a
Operating Conditions
mm
Inch
mm
Inch
mm
Inch
Inner ring has to be easily displaceable Inner ring does not have to be easily displaceable
All diameters All diameters
All diameters All diameters
All diameters All diameters
All diameters All diameters
All diameters All diameters
All diameters All diameters
Inner ring stationary in relation to the direction of the load.
g6
All loads
h6
Radial load:
Nominal Shaft Diameter
h5 j6 b k6 b m6 b
≤ 18 >18
≤ 0.71 >0.71
≤ 40
≤ 1.57
≤ 40
≤ 1.57
LIGHT
(40)-140 (140) − 320 (320) − 500
(1.57) − 5.51 (5.51) − 12.6 (126) − 19.7
(40) − 100 (100) − 320 (320) − 500
(1.57) − 3.94 (3.94) − 12.6 (126) − 19.7
n6 p6 j5 k5 m5 m6 n6 p6
>500
>19.7
>500
>19.7
≤ 18 >18
≤ 0.71 >0.71
≤ 40
≤ 1.57
≤ 40
≤ 1.57
(40) − 100 (100) − 140 (140) − 320 (320) − 500
(1.57) − 3.94 (3.94) − 5.51 (5.51) − 12.6 (12.6) − 19.7
(40) − 65 (65) − 100 (100) − 140 (140) − 280 (280) − 500
(1.57) − 2.56 (2.56) − 3.94 (3.94) − 5.51 (5.51) − 11.0 (11.0) − 19.7
Direction of load indeterminate or the inner ring rotating in relation to the direction of the load.
NORMAL
>500
>19.7
r6 r7 k5 m5 m6 b n6 b p6 b r6 b r7 b
>500
>19.7
(18) − 100
(0.71) − 3.94
>100
>3.94
≤ 40
≤ 1.57
≤ 40
≤ 1.57
(40)-65 (65) − 140 (140) − 200 (200) − 500
(1.57) − 2.56 (2.56) − 5.51 (5.51) − 7.87 (7.87) − 19.7
(40) − 65 (65) − 100 (100) − 140 (140) − 200
(1.57) − 2.56 (2.56) − 3.94 (3.94) − 5.51 (5.51) − 7.87
HEAVY
>500
>19.7
>200
>7.87
Pure Thrust Load
All diams.
All diams.
Consult Bearing Manufacturer
j6
a For solid steel shafts. For hollow or nonferrous shafts, tighter fits may be needed. b When greater accuracy is required, use j5, k5, and m5 instead of j6, k6, and m6, respectively. Numerical values are given in Table 16 and Table 17.
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