| Bearing type | Boundary Dimensions（mm） | ||
|---|---|---|---|
| d | D | B | |
| W 634 R-2Z | 4 | 16 | 5 |
| W 634-2RS1 | 4 | 16 | 5 |
| W 634-2RZ | 4 | 16 | 5 |
| W 634-2Z | 4 | 16 | 5 |
| W 635 | 5 | 19 | 6 |
| W 635 R | 5 | 19 | 6 |
| W 635 R-2RS1 | 5 | 19 | 6 |
| W 635 R-2Z | 5 | 19 | 6 |
| W 635-2RS1 | 5 | 19 | 6 |
| W 635-2RZ | 5 | 19 | 6 |
| W 635-2Z | 5 | 19 | 6 |
| W 636 | 6 | 22 | 7 |
| W 636-2RS1 | 6 | 22 | 7 |
| W 636-2RZ | 6 | 22 | 7 |
| W 636-2Z | 6 | 22 | 7 |
| W 637 | 7 | 26 | 9 |
| W 637/2-2Z | 2 | 4 | 2 |
| W 637/4 X | 4 | 10 | 3 |
| W 637/4 X-2Z | 4 | 8 | 3 |
| W 637/4 XR | 4 | 10 | 3 |
| W 637/4 XR-2Z | 4 | 8 | 3 |
| W 637/5 X-2Z | 5 | 9 | 3 |
| W 637/5 X-2ZS | 5 | 9 | 3 |
| W 637/5 XR-2Z | 5 | 9 | 3 |
| W 637/5 XR-2ZS | 5 | 9 | 3 |
| W 637/8 R-2Z | 8 | 12 | 3.5 |
| W 637/8 R-2ZS | 8 | 12 | 3.5 |
| W 637/8 X | 8 | 14 | 3.5 |
| W 637/8 XR | 8 | 14 | 3.5 |
| W 637/8-2Z | 8 | 12 | 3.5 |
