管狀物件,帶或不帶凸緣,旨在減少摩擦,並在平行於孔軸線的表面上承載動載荷。必須具有可見或可檢測的潤滑裝置,或可自潤滑。總長度必須超過外徑的25%或本體週邊平面之間的最短距離,但直管狀(無凸緣或肩部)物體除外,其承載面僅平行於孔軸線。包括分成兩段或多段,且承載圓週角不超過180度(3.141弧度)的物件。另請參閱襯套、套筒;墊片、套筒;以及墊圈(經修改)。不含:銷、空心。
1.1250 inches minimum and 1.1260 inches maximum body outside diameter, 39.0 rockwell c minimum and 43.0 rockwell c maximum overall hardness rating, 0.2450 inches minimum and 0.2500 inches maximum overall length, 0.9910 inches minimum and 0.9970 inches maximum body inside diameter, square all corners corner shape