| STEYR 2304 Bearing | 20 | 52 | 21 | STEYR | Self-aligning Ball Bearings |
| NACHI 2304 Bearing | 20 | 52 | 21 | NACHI | Self-aligning Ball Bearings |
| SNR 2304 Bearing | 20 | 52 | 21 | SNR | Self-aligning Ball Bearings |
| SKF 62304-2RS1 Bearing | 20 | 52 | 21 | SKF | Deep Groove Ball Bearings |
| KOYO NJ2304R Bearing | 20 | 52 | 21 | KOYO | Cylindrical Roller Bearings |
| KOYO 2304 Bearing | 20 | 52 | 21 | KOYO | Self-aligning Ball Bearings |
| FAG NJ2304E Bearing | 20 | 52 | 21 | FAG | Cylindrical Roller Bearings |
| SKF NUP2304ECP* Bearing | 20 | 52 | 21 | SKF | Cylindrical Roller Bearings |
| SKF 2304 E-2RS1 TN9 Bearing | 20 | 52 | 21 | SKF | Self-aligning Ball Bearings |