... ISO Quality Management System 4.Professional Exporter 1045 different type Industry Sprocket Specification MaterialC45, A3, 40Cr, 20CrMnTi, 42CrMo, ... 1045, 1023,nylon,20CrMnTi, SCM 415, stainless steel,cast iron..etcMaterial Factors : Power transmission and speed .Environment factors : ... as 1045 , 20mn,Stainless steel ,nylon, & cast iron ..etc10.OEM are welcome 11.Accredited by ISO certificationMarket ...