WD Standard Bearing Precision Class:
| Stanards | Precision Grade | ||||
| GB | G | E | D | C | B |
| ISO | Normal Class | Class 6 | Class 5 | Class 4 | Class 2 |
| ANSI | ABEC 1 | ABEC 3 | ABEC 5 | ABEC 7 | ABEC 9 |
| DIN | P0 | P6 | P5 | P4 | P2 |
| JIS | 0 | 6 | 5 | 4 | 2 |
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