| KOYO NJ2304R+HJ2304R Bearing | 20 | 52 | 21 | KOYO | Cylindrical Roller Bearings |
| RHP NU 2304 Bearing | 20 | 52 | 21 | RHP | Cylindrical Roller Bearings |
| NACHI NJ2304E+HJ2304E Bearing | 20 | 52 | 21 | NACHI | Cylindrical Roller Bearings |
| NTN NUP 2304 E Bearing | 20 | 52 | 21 | NTN | Cylindrical Roller Bearings |
| SKF 2304 TN Bearing | 20 | 52 | 21 | SKF | Self-aligning Ball Bearings |
| NACHI NJ 2304 +HJ 2304 Bearing | 20 | 52 | 21 | NACHI | Cylindrical Roller Bearings |
| NSK NUP 2304 E Bearing | 20 | 52 | 21 | NSK | Cylindrical Roller Bearings |
| FAG 2304TV Bearing | 20 | 52 | 21 | FAG | Self-aligning Ball Bearings |
| KOYO NJ2304 Bearing | 20 | 52 | 21 | KOYO | Cylindrical Roller Bearings |
| FAG NJ 2211 +HJ 2212 Bearing | 20 | 52 | 21 | FAG | Cylindrical Roller Bearings |