通常為圓柱形,有或沒有法蘭。其設計用於安裝後鑽孔,並用作軸承或襯套。不包括:散裝物品。另請參閱襯套毛坯。
0.2480 inches nominal overall length, square left flange body corner corner shape, 0.7530 inches minimum and 0.7540 inches maximum body inside diameter, 0.8757 inches minimum and 0.8767 inches maximum body outside diameter, door assy end item identification