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。
square all corners corner shape, 1.4380 inches minimum and 1.4390 inches maximum body outside diameter, door assy end item identification, 1.2530 inches minimum and 1.2540 inches maximum body inside diameter, 0.5880 inches nominal overall length