| SKF 2304 E-2RS1 TN9 Bearing | 20 | 52 | 21 | SKF | Self-aligning Ball Bearings |
| NACHI NJ 2304 E Bearing | 20 | 52 | 21 | NACHI | Cylindrical Roller Bearings |
| FAG NUP2304E Bearing | 20 | 52 | 21 | FAG | Cylindrical Roller Bearings |
| KOYO NUP 2304 Bearing | 20 | 52 | 21 | KOYO | Cylindrical Roller Bearings |
| SKF NU2304E Bearing | 20 | 52 | 21 | SKF | Cylindrical Roller Bearings |
| FAG NJ 2304 E Bearing | 20 | 52 | 21 | FAG | Cylindrical Roller Bearings |
| FAG NU2304E Bearing | 20 | 52 | 21 | FAG | Cylindrical Roller Bearings |
| FAG NU 2304 E.TVP2 Bearing | 20 | 52 | 21 | FAG | Cylindrical Roller Bearings |
| NSK 2304 Bearing | 20 | 52 | 21 | NSK | Self-aligning Ball Bearings |
| SKF 2304 TN Bearing | 20 | 52 | 21 | SKF | Self-aligning Ball Bearings |