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。
3.7520 inches minimum and 3.7620 inches maximum bore diameter, steel overall material, flat race surface style designator, 0.0920 inches minimum and 0.0950 inches maximum overall width, 4.5950 inches minimum and 4.6150 inches maximum outside diameter