| KOYO NF304 Bearing | 20 | 52 | 15 | KOYO | Cylindrical Roller Bearings |
| SKF 1304 E TN9 Bearing | 20 | 52 | 15 | SKF | Self-aligning Ball Bearings |
| NSK NU 304 Bearing | 20 | 52 | 15 | NSK | Cylindrical Roller Bearings |
| SKF 6304-2Z Bearing | 20 | 52 | 15 | SKF | Deep Groove Ball Bearings |
| KOYO 6304-2RS Bearing | 20 | 52 | 15 | KOYO | Deep Groove Ball Bearings |
| NACHI 1204 K+H 204 Bearing | 20 | 52 | 15 | NACHI | Self-aligning Ball Bearings |
| KOYO 6304 RU Bearing | 20 | 52 | 15 | KOYO | Deep Groove Ball Bearings |
| KOYO 6304BI Bearing | 20 | 52 | 15 | KOYO | Angular Contact Ball Bearings |
| NSK NSKNU304ECP Bearing | 20 | 52 | 15 | NSK | Cylindrical Roller Bearings |
| KOYO NJ304+HJ304 Bearing | 20 | 52 | 15 | KOYO | Cylindrical Roller Bearings |