Related Resources: mechanical-tolerances

Shaft Tolerance Radial Ball and Roller Bearings

Bearings Engineering and Design

Shaft Tolerance Classifications for Metric Radial Ball and Roller Bearings of ABEC-1 and RBEC-1 Tolerance Classes ANSI/ABMA 7

Operating Conditions
Ball Bearings
Cylindrical Roller
Bearings
Tolerance
Symbol
mm
Inch
mm
Inch
Inner ring stationary
in relation to the direction
of the load.
All
loads
Inner ring has to be
easily displaceable
All
diameters
All
diameters
All
diameters
All
diameters
g6
Inner ring does not have
to be easily displaceable
All
diameters
All
diameters
All
diameters
All
diameters
h6
Direction of load indeterminate
or the inner ring rotating in relation
to the direction of the load.
Radial
load:
Nominal Shaft Diameter
Light
≤18
≤0.71
h6
>18
>0.71
≤40
≤1.57
j62
(40)-140
(1.57)−5.51
k62
(140)−320
(5.51)−12.6
m62
(320)−500
(126)−19.7
n6
>500
>19.7
p6
Normal
≤18
≤0.71
j5
>18
>0.71
≤40
≤1.57
k5
(40)−100
(1.57)−3.94
m5
(100)−140
(3.94)−5.51
m6
(140)−320
(5.51)−12.6
n6
(320)−500
(12.6)−19.7
p6
>500
>19.7
r7
Heavy
(18)−100
(0.71)−3.94
k5
>100
>3.94
≤40
≤1.57
m5
(40)-65
(1.57)−2.56
m62
(65)−140
(2.56)−5.51
n62
(140)−200
(5.51)−7.87
p62
(200)−500
(7.87)−19.7
r62
>500
>19.7
r72

Operating Conditions
Spherical Roller Bearings
Tolerance
Symbol
mm
Inch
Inner ring stationary
in relation to the direction
of the load.
All
loads
Inner ring has to be
easily displaceable
All diameters
All diameters
g6
Inner ring does not have
to be easily displaceable
All diameters
All diameters
h6
Direction of load indeterminate
or the inner ring rotating in relation
to the direction of the load.
Radial
load:
Nominal Shaft Diameter
Light
≤40
≤1.57
j62
(40)−100
(1.57)−3.94
k62
(100)−320
(3.94)−12.6
m62
(320)−500
(126)−19.7
n6
>500
>19.7
p6
Normal
≤40
≤1.57
k5
(40)−65
(1.57)−2.56
m5
(65)−100
(2.56)−3.94
m6
(100)−140
(3.94)−5.51
n6
(140)−280
(5.51)−11.0
p6
(280)−500
(11.0)−19.7
r6
>500
>19.7
r7
Heavy
≤40
≤1.57
m5
(40)−65
(1.57)−2.56
m62
(65)−100
(2.56)−3.94
n62
(100)−140
(3.94)−5.51
p62
(140)−200
(5.51)−7.87
r62
>200
>7.87

1 For solid steel shafts. For hollow or nonferrous shafts, tighter fits may be needed.
2 When greater accuracy is required, use j5, k5, and m5 instead of j6, k6, and m6, respectively. N

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