| SKF 2304E-2RS1TN9 Bearing | 20 | 52 | 21 | SKF | Self-aligning Ball Bearings |
| FAG 2304.2RS.TV Bearing | 20 | 52 | 21 | FAG | Self-aligning Ball Bearings |
| NACHI 2304K Bearing | 20 | 52 | 21 | NACHI | Self-aligning Ball Bearings |
| SKF 2304M Bearing | 20 | 52 | 21 | SKF | Self-aligning Ball Bearings |
| SKF 4304ATN9 Bearing | 20 | 52 | 21 | SKF | Deep Groove Ball Bearings |
| SYEYR NU 2304 E Bearing | 20 | 52 | 21 | SYEYR | Cylindrical Roller Bearings |
| NACHI NJ 2304 E Bearing | 20 | 52 | 21 | NACHI | Cylindrical Roller Bearings |
| SKF 2304 Bearing | 20 | 52 | 21 | SKF | Self-aligning Ball Bearings |
| SKF 2304E-2RS1TN9 Bearing | 20 | 52 | 21 | SKF | Self-aligning Ball Bearings |
| KOYO NJ 2304 Bearing | 20 | 52 | 21 | KOYO | Cylindrical Roller Bearings |