| STEYR NJ 2304 E Bearing | 20 | 52 | 21 | STEYR | Cylindrical Roller Bearings |
| NSK NUP 2304 Bearing | 20 | 52 | 21 | NSK | Cylindrical Roller Bearings |
| NTN NU2304E Bearing | 20 | 52 | 21 | NTN | Cylindrical Roller Bearings |
| SKF NJ2304ECP* Bearing | 20 | 52 | 21 | SKF | Cylindrical Roller Bearings |
| NSK NJ 2304 E Bearing | 20 | 52 | 21 | NSK | Cylindrical Roller Bearings |
| FAG 32304A+T2FD020 Bearing | 20 | 52 | 21 | FAG | Tapered Roller Bearings |
| SKF NU 2304 E Bearing | 20 | 52 | 21 | SKF | Cylindrical Roller Bearings |
| SKF 2304TN Bearing | 20 | 52 | 21 | SKF | Self-aligning Ball Bearings |
| NTN NU 2304 E Bearing | 20 | 52 | 21 | NTN | Cylindrical Roller Bearings |
| FAG NJ 2304 E Bearing | 20 | 52 | 21 | FAG | Cylindrical Roller Bearings |