| Bearing model | Boundary Dimensions（mm） | ||
|---|---|---|---|
| d | D | B | |
| WBB1-8707 R-2Z | 7 | 13 | 4 |
| D/W R4 R-2RZ | 6.35 | 15.875 | 4.978 |
| D/W R4A-2RZ | 6.35 | 19.05 | 7.142 |
| D/W RW168 R | 6.35 | 9.525 | 3.967 |
| D/W R188 R-2Z | 6.35 | 12.7 | 4.762 |
| D/W R4-2RZ | 6.35 | 15.875 | 4.978 |
| D/W R188 | 6.35 | 12.7 | 3.175 |
| D/W RW168-2ZS | 6.35 | 9.525 | 3.967 |
| D/W R168 | 6.35 | 9.525 | 3.175 |
| D/W R168-2ZS | 6.35 | 9.525 | 3.175 |
| D/W RW4 | 6.35 | 15.875 | 5.77 |
| D/W R4 R-2Z | 6.35 | 15.875 | 4.978 |
| D/W R188 R | 6.35 | 12.7 | 3.175 |
| D/W R4-2Z | 6.35 | 15.875 | 4.978 |
| D/W R188-2Z | 6.35 | 12.7 | 4.762 |
| D/W R4 | 6.35 | 15.875 | 4.978 |
| D/W RW4-2Z | 6.35 | 15.875 | 5.77 |
| D/W RW188 R | 6.35 | 12.7 | 3.967 |
| D/W R4 R | 6.35 | 15.875 | 4.978 |
| D/W RW188 | 6.35 | 12.7 | 3.967 |
| D/W RW168-2Z | 6.35 | 9.525 | 3.967 |
| D/W R168 R-2ZS | 6.35 | 9.525 | 3.175 |
| D/W RW4-2RS1 | 6.35 | 15.875 | 5.77 |
| D/W RW168 | 6.35 | 9.525 | 3.967 |
| D/W RW4 R-2RS1 | 6.35 | 15.875 | 5.77 |
| D/W RW168 R-2ZS | 6.35 | 9.525 | 3.967 |
| D/W R4A-2RS1 | 6.35 | 19.05 | 7.142 |
| D/W RW168 R-2Z | 6.35 | 9.525 | 3.967 |
| D/W RW188 R-2Z | 6.35 | 12.7 | 5.558 |
| D/W R168 R-2Z | 6.35 | 9.525 | 3.175 |
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