Gamet BearingsExclusive North American distributor for Gamet Bearing.

Koyo Technical Information

4. Tolerances for bearings

a. Tolerances

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
Angular contact ball bearing JIS B 1514 Class 0 Class 6 Class 5 Class 4 Class 2