| National Precision Bearing p/n | Norma Hoffman Part Number |
| 6000 | 6100 |
| 6000Z | 6100P |
| 6000ZZ | 6100PP |
| 6000RS | 100N |
| 60002RS | 100NN |
| 6000NR | 4100 |
| 6000ZNR | 4100P |
| 6200 | 200 |
| 6200Z | 200P |
| 6200ZZ | 200PP |
| 6200RS | 200N |
| 62002RS | 200NN |
| 6200NR | 4200 |
| 6200ZNR | 4200P |
| 6300 | 300 |
| 6300Z | 300P |
| 6300ZZ | 300PP |
| 6300RS | 300N |
| 63002RS | 300NN |
| 6300NR | 4300 |
| 6300ZNR | 4300P |