一種通常呈圓形的剛性部件,用於容納軸承。它用於定位軸承,但不會包裹軸承或限制軸承的運動。
0.9370 inches nominal outside diameter, steel corrosion resisting overall material, flat race surface style designator, 0.0300 inches minimum and 0.0320 inches maximum overall width, 0.5000 inches nominal bore diameter