| SKF 4304 A TN9 Bearing | 20 | 52 | 21 | SKF | Deep Groove Ball Bearings | 
    | KOYO 2304K Bearing | 20 | 52 | 21 | KOYO | Self-aligning Ball Bearings | 
    | NTN NJ 2304 Bearing | 20 | 52 | 21 | NTN | Cylindrical Roller Bearings | 
    | NSK NJ2304E+HJ2304E Bearing | 20 | 52 | 21 | NSK | Cylindrical Roller Bearings | 
    | KOYO NJ2304+HJ2304 Bearing | 20 | 52 | 21 | KOYO | Cylindrical Roller Bearings | 
    | SKF NUP 2304 ECP  Bearing | 20 | 52 | 21 | SKF | Cylindrical Roller Bearings | 
    | FAG 2304.2RS.TV Bearing | 20 | 52 | 21 | FAG | Self-aligning Ball Bearings | 
    | FAG NJ2304E.TVP2+HJ2304E Bearing | 20 | 52 | 21 | FAG | Cylindrical Roller Bearings | 
    | FAG 32304 A+T2F D020  Bearing | 20 | 52 | 21 | FAG | Tapered Roller Bearings |