| 轴承型号 | 外形尺寸 mm | |||
| 新型号 | 老型号 | d | D | B |
| RN304 | 502304 | 20 | 44.5 | 15 | RN304E | 502304E | 20 | 45.5 | 15 |
| RN305 | 502305 | 25 | 53 | 17 | RN305E | 502305E | 25 | 54 | 17 |
| RN306 | 502306 | 30 | 62 | 19 | RN306E | 502306E | 30 | 62.5 | 19 |
| RN307 | 502307 | 35 | 68.2 | 21 | RN307E | 502307E | 35 | 70.2 | 21 |
| RN308 | 502308 | 40 | 77.5 | 23 | RN308E | 502308E | 40 | 80 | 23 |
| RN309 | 502309 | 45 | 86.5 | 25 | RN309E | 502309E | 45 | 88.5 | 25 |
