| STEYR NJ 2304 Bearing | 20 | 52 | 21 | STEYR | Cylindrical Roller Bearings |
| KOYO NU2304R Bearing | 20 | 52 | 21 | KOYO | Cylindrical Roller Bearings |
| SKF NU 2304 ECP Bearing | 20 | 52 | 21 | SKF | Cylindrical Roller Bearings |
| FAG NUP2304E Bearing | 20 | 52 | 21 | FAG | Cylindrical Roller Bearings |
| NTN NU 2304 E Bearing | 20 | 52 | 21 | NTN | Cylindrical Roller Bearings |
| NSK NJ2304E Bearing | 20 | 52 | 21 | NSK | Cylindrical Roller Bearings |
| KOYO NJ 2304 E Bearing | 20 | 52 | 21 | KOYO | Cylindrical Roller Bearings |
| SYEYR NU2304E Bearing | 20 | 52 | 21 | SYEYR | 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 |