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-23827 mil spec single material response lubrication material document and classification, 0.3743 inches minimum and 0.3750 inches maximum bore diameter, 0.4950 inches minimum and 0.5000 inches maximum inner ring width, one lip inward, one lip outward bearing seal type, rigid alignment type