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。
0.0920 inches minimum and 0.0950 inches maximum overall width, steel overall material, 2.7200 inches minimum and 2.7400 inches maximum outside diameter, flat race surface style designator, 2.0020 inches minimum and 2.0120 inches maximum bore diameter