... 3.Export North American/European 5016 chain couplingchain coupling, coupling,plate sprocket Material: C45, A3 Hardend Teeth processing: ... forging hobbing, quenching. CNC machinechain coupling,sprocket (35B 18T)KANA standard sprocket,plate wheel, chain ... taper bore sprocket,standard and non-standard sprockets etc.Material: C45, A3.... according to ISO, DIN,ANSI ...