| Bearing type | Boundary Dimensions（mm） | ||
|---|---|---|---|
| d | D | B | |
| 21305 CC | 25 | 62 | 17 |
| 21306 CC | 30 | 72 | 19 |
| 21306 CCK | 25 | 72 | 19 |
| 21306 CCK | 30 | 72 | 19 |
| 21307 CC | 35 | 80 | 21 |
| 21307 CCK | 30 | 80 | 21 |
| 21307 CCK | 35 | 80 | 21 |
| 21308 CCKW33 | 35 | 90 | 23 |
| 21308 CCKW33 | 35 | 90 | 23 |
| 21308 CCKW33 | 40 | 90 | 23 |
| 21308 CCW33 | 40 | 90 | 23 |
| 21309 CCKW33 | 40 | 100 | 25 |
| 21309 CCKW33 | 40 | 100 | 25 |
| 21309 CCKW33 | 45 | 100 | 25 |
| 21309 CCW33 | 45 | 100 | 25 |
| 21310 CCKW33 | 45 | 110 | 27 |
| 21310 CCKW33 | 45 | 110 | 27 |
| 21310 CCKW33 | 50 | 110 | 27 |
| 21310 CCW33 | 50 | 110 | 27 |
| 21311 CCKW33 | 50 | 120 | 29 |
| 21311 CCKW33 | 50 | 120 | 29 |
| 21311 CCKW33 | 55 | 120 | 29 |
| 21311 CCW33 | 55 | 120 | 29 |
| 21312 CCKW33 | 55 | 130 | 31 |
| 21312 CCKW33 | 55 | 130 | 31 |
| 21312 CCKW33 | 60 | 130 | 31 |
| 21312 CCW33 | 60 | 130 | 31 |
| 21313 CCKW33 | 60 | 140 | 33 |
| 21313 CCKW33 | 60 | 140 | 33 |
| 21313 CCKW33 | 65 | 140 | 33 |
