| KOYO NJ 304 +HJ 304 Bearing | 20 | 52 | 15 | KOYO | Cylindrical Roller Bearings |
| SKF QJ304MA Bearing | 20 | 52 | 15 | SKF | Angular Contact Ball Bearings |
| SNR 1304 Bearing | 20 | 52 | 15 | SNR | Self-aligning Ball Bearings |
| TORRINGTON 6304-RS Bearing | 20 | 52 | 15 | TORRINGTON | Deep Groove Ball Bearings |
| NTN 7304 C Bearing | 20 | 52 | 15 | NTN | Angular Contact Ball Bearings |
| NTN NJ304E Bearing | 20 | 52 | 15 | NTN | Cylindrical Roller Bearings |
| SKF QJ 304 N2PH AS* Bearing | 20 | 52 | 15 | SKF | Angular Contact Ball Bearings |
| NACHI NJ304E+HJ304E Bearing | 20 | 52 | 15 | NACHI | Cylindrical Roller Bearings |
| MRC 6304-2RS Bearing | 20 | 52 | 15 | MRC | Deep Groove Ball Bearings |
| SKF *6304-2Z Bearing | 20 | 52 | 15 | SKF | Deep Groove Ball Bearings |