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.
mil-g-21164 mil spec single material response lubrication material document and classification, lips turned inwardly bearing seal type, grease lubrication material, rigid alignment type, 1.0000 inches nominal bore diameter