| STEYR 2304K Bearing | 20 | 52 | 21 | STEYR | Self-aligning Ball Bearings |
| SKF NJ2304E Bearing | 20 | 52 | 21 | SKF | Cylindrical Roller Bearings |
| FAG 2304 Bearing | 20 | 52 | 21 | FAG | Self-aligning Ball Bearings |
| KOYO NJ 2304 +HJ 2304 Bearing | 20 | 52 | 21 | KOYO | Cylindrical Roller Bearings |
| NSK 2304 Bearing | 20 | 52 | 21 | NSK | Self-aligning Ball Bearings |
| RIV NU 2304 Bearing | 20 | 52 | 21 | RIV | Cylindrical Roller Bearings |
| NTN NJ2304 Bearing | 20 | 52 | 21 | NTN | Cylindrical Roller Bearings |
| RIV NU2304 Bearing | 20 | 52 | 21 | RIV | Cylindrical Roller Bearings |
| SYEYR NU2304E Bearing | 20 | 52 | 21 | SYEYR | Cylindrical Roller Bearings |
| FAG 2304 Bearing | 20 | 52 | 21 | FAG | Self-aligning Ball Bearings |