| Bearing Number | Boundary dimensions mm | |||
| d | D | B | rs min | |
| 6306-Z | 30 | 72 | 19 | 1.1 | 6306-ZC3 | 30 | 72 | 19 | 1.1 |
| 6306-ZZ | 30 | 72 | 19 | 1.1 | 6306-ZZC3 | 30 | 72 | 19 | 1.1 |
| 6306-ZZC3P6QE6 | 30 | 72 | 19 | 1.1 | 6305-Z | 25 | 62 | 17 | 1.1 |
| 6305-ZC3 | 25 | 62 | 17 | 1.1 | 6305-ZZ | 25 | 62 | 17 | 1.1 |
| 6305-ZZC3 | 25 | 62 | 17 | 1.1 | 6305-ZZC3P6QE6 | 25 | 62 | 17 | 1.1 |
| 6304-Z | 20 | 52 | 15 | 1.1 | 6304-ZC3 | 20 | 52 | 15 | 1.1 |
