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-81322 mil spec single material response lubrication material document and classification, grease lubrication material, 0.7440 inches minimum and 0.7470 inches maximum overall outside diameter, 0.1900 inches nominal bore diameter, 0.6200 inches minimum and 0.6250 inches maximum overall width