A rigid item usually circular in shape, designed to accommodate a bearing. It positions the bearing but does not encase it or restrain its motion.
steel comp 5140 overall material, 0.3770 inches minimum and 0.3870 inches maximum bore diameter, flat race surface style designator, 0.0920 inches minimum and 0.0950 inches maximum overall width, 0.7820 inches minimum and 0.8020 inches maximum outside diameter