Housing Tolerance Classifications for Metric Radial Ball and Roller Bearings

Related Resources: mechanical-tolerances

Housing Tolerance Classifications for Metric Radial Ball and Roller Bearings

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 Classification^a
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
				H7^b
			Housing not split axially	H6^b
	Shock with temporary complete unloading	Transitional Range^c		J6^b
Load direction is indeterminate	Light and normal
	Normal and Heavy
	Heavy Shock		split housing not recommended	K6^b
Outer ring rotating in relation to load direction	Light			M6^b
	Normal and Heavy	Outer ring need not be axially displaceable		N6^b
	Heavy		Thin wall housing not split	P6^b

^aFor cast iron or steel housings. For housings of nonferrous alloys tighter fits may be needed. ^bWhere 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. ^cThe tolerance zones are such that the outer ring may be either tight or loose in the housing.

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