| KOYO NJ 2304 Bearing | 20 | 52 | 21 | KOYO | Cylindrical Roller Bearings |
| KOYO NJ 2304 R+HJ 2304 R Bearing | 20 | 52 | 21 | KOYO | Cylindrical Roller Bearings |
| SYEYR NU 2304 Bearing | 20 | 52 | 21 | SYEYR | Cylindrical Roller Bearings |
| SKF 2304 Bearing | 20 | 52 | 21 | SKF | Self-aligning Ball Bearings |
| FAG NU 2304 E.TVP2 Bearing | 20 | 52 | 21 | FAG | Cylindrical Roller Bearings |
| KOYO NJ 2304 E +HJ 2304 E Bearing | 20 | 52 | 21 | KOYO | Cylindrical Roller Bearings |
| NSK 2304K Bearing | 20 | 52 | 21 | NSK | Self-aligning Ball Bearings |
| STEYR NUP2304 Bearing | 20 | 52 | 21 | STEYR | Cylindrical Roller Bearings |
| NSK NJ 2304 E +HJ 2304 E Bearing | 20 | 52 | 21 | NSK | Cylindrical Roller Bearings |