| Bearing type | Boundary Dimensions（mm） | ||
|---|---|---|---|
| d | D | B | |
| D/W R188-2RS1 | 6.35 | 12.7 | 4.762 |
| D/W R188-2RZ | 6.35 | 12.7 | 4.762 |
| D/W R188-2Z | 6.35 | 12.7 | 4.762 |
| D/W R2 | 3.175 | 9.525 | 3.967 |
| D/W R2 R | 3.175 | 9.525 | 3.967 |
| D/W R2 R-2RS1 | 3.175 | 9.525 | 3.967 |
| D/W R2 R-2RZ | 3.175 | 9.525 | 3.967 |
| D/W R2 R-2Z | 3.175 | 9.525 | 3.967 |
| D/W R2-2RS1 | 3.175 | 9.525 | 3.967 |
| D/W R2-2RZ | 3.175 | 9.525 | 3.967 |
| D/W R2-2Z | 3.175 | 9.525 | 3.967 |
| D/W R2-5 | 3.175 | 7.938 | 2.779 |
| D/W R2-5 R | 3.175 | 7.938 | 2.779 |
| D/W R2-5 R-2Z | 3.175 | 7.938 | 3.571 |
| D/W R2-5-2Z | 3.175 | 7.938 | 3.571 |
| D/W R2-6 | 3.175 | 9.525 | 2.779 |
| D/W R2-6 R | 3.175 | 9.525 | 2.779 |
| D/W R2-6 R-2Z | 3.175 | 9.525 | 3.571 |
| D/W R2-6-2RS1 | 3.175 | 9.525 | 3.571 |
| D/W R2-6-2RZ | 3.175 | 9.525 | 3.571 |
| D/W R2-6-2Z | 3.175 | 9.525 | 3.571 |
| D/W R2A | 3.175 | 12.7 | 4.366 |
| D/W R2A-2Z | 3.175 | 12.7 | 4.366 |
| D/W R3 | 4.762 | 12.7 | 3.967 |
| D/W R3 R | 4.762 | 12.7 | 4.978 |
| D/W R3 R-2RS1 | 4.762 | 12.7 | 4.978 |
| D/W R3 R-2Z | 4.762 | 12.7 | 4.978 |
| D/W R3-2RS1 | 4.762 | 12.7 | 4.978 |
| D/W R3-2RZ | 4.762 | 12.7 | 4.978 |
| D/W R3-2Z | 4.762 | 12.7 | 4.978 |
