| MAC N304 Bearing | 20 | 52 | 15 | MAC | Cylindrical Roller Bearings |
| NSK N304 Bearing | 20 | 52 | 15 | NSK | Cylindrical Roller Bearings |
| FAG NJ304E+HJ304E Bearing | 20 | 52 | 15 | FAG | Cylindrical Roller Bearings |
| NACHI NJ304E Bearing | 20 | 52 | 15 | NACHI | Cylindrical Roller Bearings |
| KOYO NU 304 E Bearing | 20 | 52 | 15 | KOYO | Cylindrical Roller Bearings |
| KOYO NJ 304 E Bearing | 20 | 52 | 15 | KOYO | Cylindrical Roller Bearings |
| NSK 7304B Bearing | 20 | 52 | 15 | NSK | Angular Contact Ball Bearings |
| TORRINGTON 6304 N Bearing | 20 | 52 | 15 | TORRINGTON | Deep Groove Ball Bearings |
| RHP NU304 Bearing | 20 | 52 | 15 | RHP | Cylindrical Roller Bearings |
| STEYR 1304 K Bearing | 20 | 52 | 15 | STEYR | Self-aligning Ball Bearings |