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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 | |