| NSK 2304 Bearing | 20 | 52 | 21 | NSK | Self-aligning Ball Bearings |
| FAG NJ2304E+HJ2304E Bearing | 20 | 52 | 21 | FAG | Cylindrical Roller Bearings |
| NSK NJ2304E+HJ2304E Bearing | 20 | 52 | 21 | NSK | Cylindrical Roller Bearings |
| FAG NUP 2304 E.TVP2 Bearing | 20 | 52 | 21 | FAG | Cylindrical Roller Bearings |
| FAG NJ 2304 E Bearing | 20 | 52 | 21 | FAG | Cylindrical Roller Bearings |
| KOYO NUP 2304 Bearing | 20 | 52 | 21 | KOYO | Cylindrical Roller Bearings |
| NTN NUP 2304 Bearing | 20 | 52 | 21 | NTN | Cylindrical Roller Bearings |
| NSK NUP 2304 E Bearing | 20 | 52 | 21 | NSK | Cylindrical Roller Bearings |
| NSK NJ2304+HJ2304 Bearing | 20 | 52 | 21 | NSK | Cylindrical Roller Bearings |