| Bearing No. | Boundary Dimensions(mm inch) | |||
| d | D | B | C | |
| UC305-15 | 15/16 | - | - | - |
| UC305-16 | 1 | - | - | - |
| UC306 | 30 | 72 | 43 | 23 |
| UC306-17 | 1-1/16 | 2.8346 | 1.6929 | 0.9055 |
| UC306-18 | 1-1/8 | - | - | - |
| UC306-19 | 1-3/16 | - | - | - |
| UC307 | 35 | 80 | 48 | 25 |
| UC307-20 | 1-1/4 | 3.1496 | 1.8898 | 0.9843 |
| UC307-21 | 1-5/16 | - | - | - |
| UC307-22 | 1-3/8 | - | - | - |
| UC307-23 | 1-7/16 | - | - | - |
| UC308 | 40 | 90 | 52 | 27 |
| UC308-24 | 1-1/2 | 3.5433 | 2.0472 | 1.063 |
| UC308-25 | 1-9/16 | - | - | - |
| UC309 | 45 | 100 | 57 | 30 |
| UC309-26 | 1-5/8 | 3.937 | 2.2441 | 1.1811 |
| UC309-27 | 1-11/16 | - | - | - |
| UC309-28 | 1-3/4 | - | - | - |
| UC310 | 50 | 110 | 61 | 32 |
| UC310-30 | 1-7/8 | 4.3307 | 2.4016 | 1.2598 |
| UC310-31 | 1-15/16 | - | - | - |
| UC311 | 55 | 120 | 66 | 34 |
| UC311-32 | 2 | 4.7244 | 2.5984 | 1.3386 |
| UC311-33 | 2-1/16 | - | - | - |