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。
flat race surface style designator, 0.1230 inches minimum and 0.1260 inches maximum overall width, 1.4070 inches minimum and 1.4270 inches maximum outside diameter, 0.8770 inches minimum and 0.8870 inches maximum bore diameter, steel overall material