| KOYO NJ 2304 E Bearing | 20 | 52 | 21 | KOYO | Cylindrical Roller Bearings |
| NTN NU 2304 Bearing | 20 | 52 | 21 | NTN | Cylindrical Roller Bearings |
| NTN 2304 K Bearing | 20 | 52 | 21 | NTN | Self-aligning Ball Bearings |
| FAG NUP 2304 E Bearing | 20 | 52 | 21 | FAG | Cylindrical Roller Bearings |
| KOYO NJ2304E+HJ2304E Bearing | 20 | 52 | 21 | KOYO | Cylindrical Roller Bearings |
| KOYO NJ2304E+HJ2304E Bearing | 20 | 52 | 21 | KOYO | Cylindrical Roller Bearings |
| NTN NUP 2304 Bearing | 20 | 52 | 21 | NTN | Cylindrical Roller Bearings |
| FAG NU2304E Bearing | 20 | 52 | 21 | FAG | Cylindrical Roller Bearings |
| NTN NUP2304 Bearing | 20 | 52 | 21 | NTN | Cylindrical Roller Bearings |