| Bearing type | Boundary Dimensions（mm） | ||
|---|---|---|---|
| d | D | B | |
| D/W R144W.0937-2ZS | 3.175 | 6.35 | 2.38 |
| D/W R1-5 | 2.38 | 7.938 | 2.779 |
| D/W R1-5 R | 2.38 | 7.938 | 2.779 |
| D/W R1-5 R-2Z | 2.38 | 7.938 | 3.571 |
| D/W R1-5-2Z | 2.38 | 7.938 | 3.571 |
| D/W R155 | 3.967 | 7.938 | 2.779 |
| D/W R155 R | 3.967 | 7.938 | 2.779 |
| D/W R155 R-2ZS | 3.967 | 7.938 | 3.175 |
| D/W R155-2ZS | 3.967 | 7.938 | 3.175 |
| D/W R156 | 4.762 | 7.938 | 2.779 |
| D/W R156 R | 4.762 | 7.938 | 2.779 |
| D/W R156 R-2ZS | 4.762 | 7.938 | 3.175 |
| D/W R156-2ZS | 4.762 | 7.938 | 3.175 |
| D/W R166 | 4.762 | 9.525 | 3.175 |
| D/W R166 R | 4.762 | 9.525 | 3.175 |
| D/W R166 R-2Z | 4.762 | 9.525 | 3.175 |
| D/W R166-2Z | 4.762 | 9.525 | 3.175 |
| D/W R168 | 6.35 | 9.525 | 3.175 |
| D/W R168 R | 6.35 | 9.525 | 3.175 |
| D/W R168 R-2Z | 6.35 | 9.525 | 3.175 |
| D/W R168 R-2ZS | 6.35 | 9.525 | 3.175 |
| D/W R168-2Z | 6.35 | 9.525 | 3.175 |
| D/W R168-2ZS | 6.35 | 9.525 | 3.175 |
| D/W R1810 | 7.938 | 12.7 | 3.967 |
| D/W R1810 R | 7.938 | 12.7 | 3.967 |
| D/W R1810 R-2ZS | 7.938 | 12.7 | 3.967 |
| D/W R1810-2ZS | 7.938 | 12.7 | 3.967 |
| D/W R188 | 6.35 | 12.7 | 3.175 |
| D/W R188 R | 6.35 | 12.7 | 3.175 |
| D/W R188 R-2Z | 6.35 | 12.7 | 4.762 |
