... 3.ISO Quality Management System 4.Professional Exporter 1045 different type Industry Sprocket Specification MaterialC45, A3, 40Cr, 20CrMnTi, 42CrMo, ... ,quintuples,o on.Hub style : Type A (Hubless) or Type B (Hub) or Typle C (Hub on both size) or Type D(detacheable ... bolt on hub)International Standard : ANSI B29.1MMaterial Selection : 1045 ...