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。
3.8400 inches nominal bore diameter, steel comp 1018 or steel comp e52100 or steel comp 1074 overall material, 0.1850 inches minimum and 0.1880 inches maximum overall width, 66,aisi/sae 1018 fed std 1st material response or 66,aisi/sae e52100 fed std 2nd material response or 66,aisi/sae 1074 fed std 3rd material response overall material document and classification, 4.7460 inches minimum and 4.7480 inches maximum outside diameter