| SKF NUP 2304 E CP* Bearing | 20 | 52 | 21 | SKF | Cylindrical Roller Bearings | 
    | KOYO NJ 2304 Bearing | 20 | 52 | 21 | KOYO | Cylindrical Roller Bearings | 
    | FAG NJ 2211 +HJ 2212 Bearing | 20 | 52 | 21 | FAG | Cylindrical Roller Bearings | 
    | SKF NJ2304E Bearing | 20 | 52 | 21 | SKF | Cylindrical Roller Bearings | 
    | NSK NUP2304E Bearing | 20 | 52 | 21 | NSK | Cylindrical Roller Bearings | 
    | NSK NJ2304E+HJ2304E Bearing | 20 | 52 | 21 | NSK | Cylindrical Roller Bearings | 
    | SKF 2304E-2RS1TN9 Bearing | 20 | 52 | 21 | SKF | Self-aligning Ball Bearings | 
    | NSK NJ2304E+HJ2304E Bearing | 20 | 52 | 21 | NSK | Cylindrical Roller Bearings | 
    | FAG 2304.2RS.TV Bearing | 20 | 52 | 21 | FAG | Self-aligning Ball Bearings |