| KOYO NJ 304 E Bearing | 20 | 52 | 15 | KOYO | Cylindrical Roller Bearings |
| SNR 1304 Bearing | 20 | 52 | 15 | SNR | Self-aligning Ball Bearings |
| NACHI 6304-RZ Bearing | 20 | 52 | 15 | NACHI | Deep Groove Ball Bearings |
| NACHI 6304-2RZ Bearing | 20 | 52 | 15 | NACHI | Deep Groove Ball Bearings |
| SKF W 6304 Bearing | 20 | 52 | 15 | SKF | Deep Groove Ball Bearings |
| SKF *7304BECBP Bearing | 20 | 52 | 15 | SKF | Angular Contact Ball Bearings |
| STEYR 1304 Bearing | 20 | 52 | 15 | STEYR | Self-aligning Ball Bearings |
| NSK NUP304 Bearing | 20 | 52 | 15 | NSK | Cylindrical Roller Bearings |
| NSK NJ304 Bearing | 20 | 52 | 15 | NSK | Cylindrical Roller Bearings |
| SKF NU 304 ECP Bearing | 20 | 52 | 15 | SKF | Cylindrical Roller Bearings |