... 3.ISO Quality Management System 4.Professional Exporter 1045 different type Industry Sprocket Specification MaterialC45, A3, 40Cr, 20CrMnTi, 42CrMo, ... box or customer requirement.Industry Roller Chain Sprocket-Simplex Type B Product range from simplex,duplex,triplex quadruplex, ... Hub) or Typle C (Hub on both size) or Type D(detacheable bolt on hub)International Standard : ANSI B29.1MMaterial Selection ...