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。
3.5560 millimeters minimum and 3.5810 millimeters maximum overall length, 70.9399 millimeters nominal body inside diameter, bs 1449 en2a 00501 mfr ref 1st material response outer layer material document and classification, 75.2350 millimeters minimum and 76.2510 millimeters maximum body outside diameter, square all corners corner shape