Bearing Types and Tolerance Class

Bearing tolerances and permissible values for the boundary dimensions and running accuracy of bearings are specified. These values are prescribed in JIS B 1514 "tolerances for rolling bearings." (These JIS standards are based on ISO standards.)

Bearing tolerances are standardized by classifying bearings into the following six classes (accuracy in tolerances becomes higher in the order described): 0, 6X, 6, 5, 4 and 2.

Bearing type		Applied standards	Applied tolerance class
Deep groove ball bearing		JIS B 1514	Class 0	-	Class 6	Class 5	Class 4	Class 2
Angular contact ball bearing			Class 0	-	Class 6	Class 5	Class 4	Class 2
Self-aligning ball bearing			Class 0	-	-	-	-	-
Spherical roller bearing			Class 0	-	-	-	-	-
Cylindrical roller bearing			Class 0	-	Class 6	Class 5	Class 4	Class 2
Needle roller bearing (Machined ring type)			Class 0	-	Class 6	Class 5	Class 4	-
Tapered roller bearing	Metric series (Single row)	JIS B 1514	Class 0	Class 6X	Class 6	Class 5	Class 4	Class 2
	Metric series (Double or four-row)	BAS 1002	Class 0	-	-	-	-	-
	Inch series	ABMA	Class 4	-	Class 2	Class 3	Class 0	Class 00
	Metric series (J-series)		Class PK	-	Class PN	Class PC	Class PB	-
Thrust roller bearing		JIS B 1514	Class 0	-	Class 6	Class 5	Class 4	-
Spherical thrust roller bearing			Class 0	-	-	-	-	-