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, grease lubrication material, rigid alignment type, 0.3750 inches nominal bore diameter, 0.8125 inches nominal inner ring width