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。
0.0625 inches minimum and 0.0635 inches maximum overall width, 0.1270 inches minimum and 0.1290 inches maximum bore diameter, astm a582 or a581 type 303 assn std single material response overall material document and classification, steel comp 303 overall material, 0.2450 inches minimum and 0.2500 inches maximum outside diameter