| NTN NJ2304E+HJ2304E Bearing | 20 | 52 | 21 | NTN | Cylindrical Roller Bearings |
| NACHI 2304 K Bearing | 20 | 52 | 21 | NACHI | Self-aligning Ball Bearings |
| NACHI NJ 2304 +HJ 2304 Bearing | 20 | 52 | 21 | NACHI | Cylindrical Roller Bearings |
| STEYR 2304 Bearing | 20 | 52 | 21 | STEYR | Self-aligning Ball Bearings |
| FAG NUP2304E Bearing | 20 | 52 | 21 | FAG | Cylindrical Roller Bearings |
| SKF N2304 Bearing | 20 | 52 | 21 | SKF | Cylindrical Roller Bearings |
| NACHI NJ 2304 E +HJ 2304 E Bearing | 20 | 52 | 21 | NACHI | Cylindrical Roller Bearings |
| NSK 2304 Bearing | 20 | 52 | 21 | NSK | Self-aligning Ball Bearings |
| FAG NJ2304E Bearing | 20 | 52 | 21 | FAG | Cylindrical Roller Bearings |
| SKF NU2304E Bearing | 20 | 52 | 21 | SKF | Cylindrical Roller Bearings |