Shaft Tolerance Radial Ball and Roller Bearings

Related Resources: mechanical-tolerances

Shaft Tolerance Radial Ball and Roller Bearings

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
Operating Conditions			mm	Inch	mm	Inch	Tolerance Symbol
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
	All loads	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
Operating Conditions			mm	Inch	Tolerance Symbol
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
	All loads	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