| STEYR 2304K Bearing | 20 | 52 | 21 | STEYR | Self-aligning Ball Bearings |
| SKF NJ2304E Bearing | 20 | 52 | 21 | SKF | Cylindrical Roller Bearings |
| KOYO NU 2304 E Bearing | 20 | 52 | 21 | KOYO | Cylindrical Roller Bearings |
| SKF 2304 Bearing | 20 | 52 | 21 | SKF | Self-aligning Ball Bearings |
| NSK NJ2304+HJ2304 Bearing | 20 | 52 | 21 | NSK | Cylindrical Roller Bearings |
| NSK NU 2304 E Bearing | 20 | 52 | 21 | NSK | Cylindrical Roller Bearings |
| SKF 2304M Bearing | 20 | 52 | 21 | SKF | Self-aligning Ball Bearings |
| FAG NUP2304E.TVP2 Bearing | 20 | 52 | 21 | FAG | Cylindrical Roller Bearings |
| KOYO 2304 Bearing | 20 | 52 | 21 | KOYO | Self-aligning Ball Bearings |
| KOYO NU 2304 R Bearing | 20 | 52 | 21 | KOYO | Cylindrical Roller Bearings |