... delivery time 3.ISO Quality Management System 4.Professional Exporter 1045 different type Industry Sprocket Specification MaterialC45, A3, 40Cr, 20CrMnTi ... bolt on hub)International Standard : ANSI B29.1MMaterial Selection : 1045, 1023,nylon,20CrMnTi, SCM 415, stainless steel,cast iron.. ... of america.9.Material can requested by customer such as 1045 , 20mn,Stainless steel ,nylon, & cast iron ..etc10. ...