| SKF 2304 E-2RS1 Bearing | 20 | 52 | 21 | SKF | Self-aligning Ball Bearings |
| FAG NUP2304E Bearing | 20 | 52 | 21 | FAG | Cylindrical Roller Bearings |
| STEYR 2304K Bearing | 20 | 52 | 21 | STEYR | Self-aligning Ball Bearings |
| RHP 2304 Bearing | 20 | 52 | 21 | RHP | Self-aligning Ball Bearings |
| KOYO 2304 Bearing | 20 | 52 | 21 | KOYO | Self-aligning Ball Bearings |
| KOYO NUP2304 Bearing | 20 | 52 | 21 | KOYO | Cylindrical Roller Bearings |
| STEYR NJ2304E Bearing | 20 | 52 | 21 | STEYR | Cylindrical Roller Bearings |
| SKF NUP 2304 E CP* Bearing | 20 | 52 | 21 | SKF | Cylindrical Roller Bearings |
| ZKL NU2304 Bearing | 20 | 52 | 21 | ZKL | Cylindrical Roller Bearings |
| FAG 32304 A+T2F D020 Bearing | 20 | 52 | 21 | FAG | Tapered Roller Bearings |