| SKF 4304 A TN9 Bearing | 20 | 52 | 21 | SKF | Deep Groove Ball Bearings |
| KOYO 2304K Bearing | 20 | 52 | 21 | KOYO | Self-aligning Ball Bearings |
| NTN NJ 2304 Bearing | 20 | 52 | 21 | NTN | Cylindrical Roller Bearings |
| NSK NJ2304E+HJ2304E Bearing | 20 | 52 | 21 | NSK | Cylindrical Roller Bearings |
| KOYO NJ2304+HJ2304 Bearing | 20 | 52 | 21 | KOYO | Cylindrical Roller Bearings |
| SKF NUP 2304 ECP Bearing | 20 | 52 | 21 | SKF | Cylindrical Roller Bearings |
| FAG 2304.2RS.TV Bearing | 20 | 52 | 21 | FAG | Self-aligning Ball Bearings |
| FAG NJ2304E.TVP2+HJ2304E Bearing | 20 | 52 | 21 | FAG | Cylindrical Roller Bearings |
| FAG 32304 A+T2F D020 Bearing | 20 | 52 | 21 | FAG | Tapered Roller Bearings |