| NACHI NJ2304+HJ2304 Bearing | 20 | 52 | 21 | NACHI | Cylindrical Roller Bearings |
| SKF NJ2304ECP Bearing | 20 | 52 | 21 | SKF | Cylindrical Roller Bearings |
| SKF NJ 2304 E CP Bearing | 20 | 52 | 21 | SKF | Cylindrical Roller Bearings |
| NSK NU2304 Bearing | 20 | 52 | 21 | NSK | Cylindrical Roller Bearings |
| NACHI 2304 Bearing | 20 | 52 | 21 | NACHI | Self-aligning Ball Bearings |
| SKF NUP 2304 E Bearing | 20 | 52 | 21 | SKF | Cylindrical Roller Bearings |
| FAG NJ 2211 +HJ 2212 Bearing | 20 | 52 | 21 | FAG | Cylindrical Roller Bearings |
| ZKL NU 2304 Bearing | 20 | 52 | 21 | ZKL | Cylindrical Roller Bearings |
| SKF 2304E-2RS1TN9 Bearing | 20 | 52 | 21 | SKF | Self-aligning Ball Bearings |