Standard and optional tolerance classes for SKF super-precision bearings
| Bearing type | Standard tolerance class | Optional tolerance class |
| Angular contact ball bearings | P4A or P41) | P4B2) or PA9A or P23) |
| Cylindrical roller bearings | SP | UP |
| Double direction angular | SP | UP |
| contact thrust ball bearings | ||
| in the BTW series | ||
| Double direction angular | P4C | – |
| contact thrust ball bearings | ||
| in the BTM series | ||
| Angular contact thrust ball | P4A | – |
| bearings for screw drives | ||
| Axial-radial cylindrical roller | – | – |
| bearings4) |
- 1) only for 718 D and S70 W series
- 2) only for some sizes in the 719 D, 70 D and 70 E series
- 3) only for 718 D series
-
4)
Radial run-out equal to or better than P4, axial run-out close to P4. Reduced axial and radial run-out on request.
