Related Resources: mechanical-tolerances

Housing Tolerance Classifications for Metric Radial Ball and Roller Bearings

Bearings Engineering and Design

Selection of Housing Hole Tolerance Classifications for Metric Radial Ball and Roller Bearings of ABEC-1 and RBEC-1 Tolerance Classes

Design and Operating Conditions
Tolerance Classificationa
Rotational Conditions
Loading
Outer Ring Axial Displacement Limitations
Other Conditions
Outer ring stationary in relation to load direction
Light Normal and Heavy
Outer ring must be easily axially displaceable
Heat input through shaft Housing split axially
G7
H7b
Housing not split axially
H6b
Shock with temporary complete unloading
Transitional Rangec
J6b
Load direction is indeterminate
Light and normal
Normal and Heavy
Heavy Shock
split housing not recommended
K6b
Outer ring rotating in relation to load direction
Light
M6b
Normal and Heavy
Outer ring need not be axially displaceable
N6b
Heavy
Thin wall housing not split
P6b

a For cast iron or steel housings. For housings of nonferrous alloys tighter fits may be needed.
b
Where wider tolerances are permissible, use tolerance classifications P7, N7, M7, K7, J7, and H7, in place of P6, N6, M6, K6, J6, and H6, respectively.
c
The tolerance zones are such that the outer ring may be either tight or loose in the housing.

Related:

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

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