| NTN 1304K Bearing | 20 | 52 | 15 | NTN | Self-aligning Ball Bearings |
| SKF NJ 304 E CP* Bearing | 20 | 52 | 15 | SKF | Cylindrical Roller Bearings |
| FAG 6304-ZN Bearing | 20 | 52 | 15 | FAG | Deep Groove Ball Bearings |
| SKF QJ 304 M A* Bearing | 20 | 52 | 15 | SKF | Angular Contact Ball Bearings |
| KOYO 6304 Z Bearing | 20 | 52 | 15 | KOYO | Deep Groove Ball Bearings |
| STEYR N 304 Bearing | 20 | 52 | 15 | STEYR | Cylindrical Roller Bearings |
| RIV NJ304 Bearing | 20 | 52 | 15 | RIV | Cylindrical Roller Bearings |
| KOYO NU 304 Bearing | 20 | 52 | 15 | KOYO | Cylindrical Roller Bearings |
| NACHI 6304-RS Bearing | 20 | 52 | 15 | NACHI | Deep Groove Ball Bearings |
| SKF 7304BEP Bearing | 20 | 52 | 15 | SKF | Angular Contact Ball Bearings |