베어링을 수용하도록 설계된, 대개 원형의 단단한 물체. 베어링의 위치를 정하지만, 베어링을 감싸거나 움직임을 제한하지는 않습니다.
qq-b-637 fed spec single material response and qq-c-465 fed spec single material response overall material document and classification, 0.5300 inches minimum and 0.5320 inches maximum overall width, copper alloy and copper alloy 642 overall material, non-separable style designator, 10.8880 inches minimum and 10.8900 inches maximum outside diameter