| SKF *NUP2304ECP Bearing | 20 | 52 | 21 | SKF | Cylindrical Roller Bearings |
| SKF 2304TN Bearing | 20 | 52 | 21 | SKF | Self-aligning Ball Bearings |
| SKF 2304E-2RS1TN9 Bearing | 20 | 52 | 21 | SKF | Self-aligning Ball Bearings |
| NSK NSK62304-2RS1 Bearing | 20 | 52 | 21 | NSK | Deep Groove Ball Bearings |
| NSK NJ 2304 Bearing | 20 | 52 | 21 | NSK | Cylindrical Roller Bearings |
| KOYO NJ 2304 R Bearing | 20 | 52 | 21 | KOYO | Cylindrical Roller Bearings |
| FAG 2304.2RS.TV Bearing | 20 | 52 | 21 | FAG | Self-aligning Ball Bearings |
| FAG 2304 Bearing | 20 | 52 | 21 | FAG | Self-aligning Ball Bearings |
| NACHI NJ2304 Bearing | 20 | 52 | 21 | NACHI | Cylindrical Roller Bearings |