low alloy structural steel cylindrical sleeve pipe 1.high accuracy 2.OEM offered 3.competitive price 4.quick delivery low alloy structural steel cylindrical sleeve for heavy machines industry part namematerialdimension(mm)weight(kg)finishbearing bushingtensile structural steelS355JRd168*220holes M12H6 Φ12 13.4surface nickle-platingfilm thickness 20umphosphorus content min 10% cone frustum shaft ...