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。
steel comp 5140 overall material, 3.2200 inches minimum and 3.2400 inches maximum outside diameter, 2.5020 inches minimum and 2.5120 inches maximum bore diameter, 0.0300 inches minimum and 0.0320 inches maximum overall width, flat race surface style designator