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。
0.3770 inches minimum and 0.3870 inches maximum bore diameter, flat race surface style designator, 0.0920 inches minimum and 0.0950 inches maximum overall width, 0.7820 inches minimum and 0.8020 inches maximum outside diameter, steel comp 5140 overall material