Table 15. Selection of Housing Tolerance Classifications for Metric Radial Ball and Roller Bearings of ABEC-1 and RBEC-1 Tolerance Classes Design and Operating Conditions
Outer Ring Axial Displacement Limitations
Tolerance Classification a
Rotational Conditions
Loading
Other Conditions
Heat input through shaft
G7
Light Normal and Heavy
Outer ring must be easily axially displaceable
Housing split axially
Outer ring stationary in relation to load direction
H7 b
H6 b
Shock with temporary complete unloading Light and normal Normal and Heavy Heavy Shock
Housing not split axially
J6 b
Load direction is indeterminate
Transitional Range c
K6 b M6 b N6 b
Split housing not recommended
Light
Outer ring rotating in relation to load direction
Normal and Heavy
Outer ring need not be axially displaceable
Thin wall housing not split
Heavy
P6 b
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.
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