| NSK NJ2304+HJ2304 Bearing | 20 | 52 | 21 | NSK | Cylindrical Roller Bearings |
| NACHI NJ 2304 +HJ 2304 Bearing | 20 | 52 | 21 | NACHI | Cylindrical Roller Bearings |
| SKF NJ 2304 E CP* Bearing | 20 | 52 | 21 | SKF | Cylindrical Roller Bearings |
| NTN NU 2304 E Bearing | 20 | 52 | 21 | NTN | Cylindrical Roller Bearings |
| NTN NJ2304+HJ2304 Bearing | 20 | 52 | 21 | NTN | Cylindrical Roller Bearings |
| NTN NUP 2304 E Bearing | 20 | 52 | 21 | NTN | Cylindrical Roller Bearings |
| NSK NJ2304E+HJ2304E Bearing | 20 | 52 | 21 | NSK | Cylindrical Roller Bearings |
| SKF *NUP2304ECP Bearing | 20 | 52 | 21 | SKF | Cylindrical Roller Bearings |
| KOYO 2304K+H2304 Bearing | 20 | 52 | 21 | KOYO | Self-aligning Ball Bearings |
| FAG NJ2304E Bearing | 20 | 52 | 21 | FAG | Cylindrical Roller Bearings |