Comparison of the tolerance classes
| SKF tolerance class | Standard tolerance classes in accordance with different standards | |||||
| Geometrical tolerances | Dimensional tolerances | |||||
| ISO1) | ANSI/ABMA2) | DIN3) | ISO1) | ANSI/ABMA2) | DIN3) | |
| P4A | 24) | ABEC 94) | P24) | 4 | ABEC 7 | P4 |
| P4B | 24) | ABEC 94) | P24) | 45) | ABEC 75) | P45) |
| P4C | 4 | ABEC 7 | P4 | 4 | ABEC 7 | P4 |
| P4 | 4 | ABEC 7 | P4 | 4 | ABEC 7 | P4 |
| P5 | 5 | ABEC 5 | P5 | 5 | ABEC 5 | P5 |
| P2 | 2 | ABEC 9 | P2 | 2 | ABEC 9 | P2 |
| PA9A | 2 | ABEC 9 | P2 | 2 | ABEC 9 | P2 |
| SP | 4 | ABEC 7 | P4 | 5 | ABEC 5 | P5 |
| UP6) | 2 | ABEC 9 | P2 | 4 | ABEC 7 | P4 |
- 1) ISO 492 or ISO 199
- 2) ANSI/ABMA Std 20.1996
- 3) DIN 620-2:1998 or DIN 620-3:1982
- 4) Valid for bearings with d < 120 mm. Larger bearings in accordance with ISO 4 or better, ABEC 7 or better, DIN P4 or better.
- 5) Narrower tolerance range within ISO 4, ABEC 7, and DIN P4 on bore and outside diameter
- 6) Depending on bearing size, accuracy might be even better
