| KOYO NU 2304 Bearing | 20 | 52 | 21 | KOYO | Cylindrical Roller Bearings |
| KOYO NJ2304E Bearing | 20 | 52 | 21 | KOYO | Cylindrical Roller Bearings |
| STEYR NUP2304 Bearing | 20 | 52 | 21 | STEYR | Cylindrical Roller Bearings |
| SKF *NJ2304ECP Bearing | 20 | 52 | 21 | SKF | Cylindrical Roller Bearings |
| RIV NJ 2304 Bearing | 20 | 52 | 21 | RIV | Cylindrical Roller Bearings |
| FAG NUP 2304 E Bearing | 20 | 52 | 21 | FAG | Cylindrical Roller Bearings |
| FAG 32304 A+T2F D020 Bearing | 20 | 52 | 21 | FAG | Tapered Roller Bearings |
| RHP NU 2304 Bearing | 20 | 52 | 21 | RHP | Cylindrical Roller Bearings |
| NACHI NJ2304 Bearing | 20 | 52 | 21 | NACHI | Cylindrical Roller Bearings |
| SKF 2304TN Bearing | 20 | 52 | 21 | SKF | Self-aligning Ball Bearings |