1. Tolerances for bearings

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.
Table 4-1 Bearing types and tolerance class
Bearing type
Applied standards
Applied tolerance class
Tolerance table
Deep groove ball bearing JIS B 1514
Class 0
-
Class 6
Class 5
Class 4
Class 2
Table4-1
Table 4-2
 Table 4-3
Table 4-4
Table 4-5
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
6XClass
Class 6
Class 5
Class 4
-
Table 4-6
 Table 4-7
 Table 4-8
Metric series (Double or four-row) BAS 1002
Class 0
-
-
-
-
-
Table 4-9
Inch series ABMA
Class 4
-
Class 2
Class 3
Class 0
Class 00
Table 4-10
Metric series (J-series)  
Class PK
-
Class PN
Class PC
Class PB
-
Table 4-11
Thrust roller bearing JIS B 1514
Class 0
-
Class 6
Class 5
Class 4
-
Table 4-12
Spherical thrust roller bearing
Class 0
-
-
-
-
-
Table 4-13