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。
flat race surface style designator, 0.77 millimeters minimum and 0.83 millimeters maximum overall width, 12.0 millimeters nominal bore diameter, 26.0 millimeters nominal outside diameter, steel overall material