A single or multiple-row antifriction bearing used with or without inner or outer races characterized by relatively small size rollers usually not ranging above 0.250 inch (6.35mm) diameter and generally longer in length in relation to diameter.
0.3020 inches minimum and 0.3120 inches maximum overall width, 0.5000 inches nominal overall outside diameter, steel overall material, rigid alignment type, 0.3125 inches nominal bore diameter