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.
flat race surface style designator, 0.1380 inches minimum and 0.1420 inches maximum overall width, 2.0290 inches minimum and 2.0300 inches maximum outside diameter, 1.2550 inches minimum and 1.2650 inches maximum bore diameter, steel comp e52100 overall material