... American/European 5016 chain couplingchain coupling, coupling,plate sprocket Material: C45, A3 Hardend Teeth processing: forging hobbing, quenching. CNC machinechain coupling ... ,taper bore sprocket,standard and non-standard sprockets etc.Material: C45, A3.... according to ISO, DIN,ANSI,JIS,BS,KANA,SATI ...