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。
3.0 inches nominal body outside diameter, door,qawt,26x66 doors end item identification, 2.301 inches nominal body inside diameter, 0.19 inches nominal flange width, 3.0 inches nominal flange outside diameter