| FAG 2304TV Bearing | 20 | 52 | 21 | FAG | Self-aligning Ball Bearings |
| SKF 4304ATN9 Bearing | 20 | 52 | 21 | SKF | Deep Groove Ball Bearings |
| NSK NUP 2304 Bearing | 20 | 52 | 21 | NSK | Cylindrical Roller Bearings |
| SKF 2304TN Bearing | 20 | 52 | 21 | SKF | Self-aligning Ball Bearings |
| NTN 2304 K Bearing | 20 | 52 | 21 | NTN | Self-aligning Ball Bearings |
| SKF 2304E-2RS1TN9 Bearing | 20 | 52 | 21 | SKF | Self-aligning Ball Bearings |
| NACHI NJ2304E Bearing | 20 | 52 | 21 | NACHI | Cylindrical Roller Bearings |
| MAC NUP2304 Bearing | 20 | 52 | 21 | MAC | Cylindrical Roller Bearings |
| SKF 2304 E-2RS1 TN9 Bearing | 20 | 52 | 21 | SKF | Self-aligning Ball Bearings |
| KOYO NU2304R Bearing | 20 | 52 | 21 | KOYO | Cylindrical Roller Bearings |