| KOYO NJ2304 Bearing | 20 | 52 | 21 | KOYO | Cylindrical Roller Bearings |
| KOYO NJ2304R Bearing | 20 | 52 | 21 | KOYO | Cylindrical Roller Bearings |
| NTN NJ 2304 E Bearing | 20 | 52 | 21 | NTN | Cylindrical Roller Bearings |
| NACHI 2304 Bearing | 20 | 52 | 21 | NACHI | Self-aligning Ball Bearings |
| SYEYR NU 2304 E Bearing | 20 | 52 | 21 | SYEYR | Cylindrical Roller Bearings |
| NSK NSKNU2304ECP Bearing | 20 | 52 | 21 | NSK | Cylindrical Roller Bearings |
| NACHI NJ2304+HJ2304 Bearing | 20 | 52 | 21 | NACHI | Cylindrical Roller Bearings |
| FAG NUP2304E Bearing | 20 | 52 | 21 | FAG | Cylindrical Roller Bearings |
| NTN NJ 410 +HJ 411 Bearing | 20 | 52 | 21 | NTN | Cylindrical Roller Bearings |
| NTN NU2304E Bearing | 20 | 52 | 21 | NTN | Cylindrical Roller Bearings |