| Bearing type | Boundary Dimensions（mm） | ||
|---|---|---|---|
| d | D | B | |
| D/W RW166 | 4.762 | 9.525 | 3.967 |
| D/W RW166 R | 4.762 | 9.525 | 3.967 |
| D/W RW166 R-2Z | 4.762 | 9.525 | 3.967 |
| D/W RW166-2Z | 4.762 | 9.525 | 3.967 |
| D/W RW168 | 6.35 | 9.525 | 3.967 |
| D/W RW168 R | 6.35 | 9.525 | 3.967 |
| D/W RW168 R-2Z | 6.35 | 9.525 | 3.967 |
| D/W RW168 R-2ZS | 6.35 | 9.525 | 3.967 |
| D/W RW168-2Z | 6.35 | 9.525 | 3.967 |
| D/W RW168-2ZS | 6.35 | 9.525 | 3.967 |
| D/W RW1810 | 7.938 | 12.7 | 4.762 |
| D/W RW1810 R | 7.938 | 12.7 | 4.762 |
| D/W RW1810 R-2ZS | 7.938 | 12.7 | 4.762 |
| D/W RW1810-2ZS | 7.938 | 12.7 | 4.762 |
| D/W RW188 | 6.35 | 12.7 | 3.967 |
| D/W RW188 R | 6.35 | 12.7 | 3.967 |
| D/W RW188 R-2Z | 6.35 | 12.7 | 5.558 |
| D/W RW188-2Z | 6.35 | 12.7 | 5.558 |
| D/W RW2 | 3.175 | 9.525 | 4.762 |
| D/W RW2 R | 3.175 | 9.525 | 4.762 |
| D/W RW2 R-2RS1 | 3.175 | 9.525 | 4.762 |
| D/W RW2 R-2Z | 3.175 | 9.525 | 4.762 |
| D/W RW2-2RS1 | 3.175 | 9.525 | 4.762 |
| D/W RW2-2Z | 3.175 | 9.525 | 4.762 |
| D/W RW2-5 | 3.175 | 7.938 | 3.571 |
| D/W RW2-5 R | 3.175 | 7.938 | 3.571 |
| D/W RW2-5 R-2Z | 3.175 | 7.938 | 4.366 |
| D/W RW2-5-2Z | 3.175 | 7.938 | 4.366 |
| D/W RW2-6 | 3.175 | 9.525 | 3.571 |
| D/W RW2-6 R | 3.175 | 9.525 | 3.571 |
