... service offered 3.Export North American/European 5016 chain couplingchain coupling, coupling,plate sprocket Material: C45, A3 Hardend Teeth processing: ... . CNC machinechain coupling,sprocket (35B 18T)KANA standard sprocket,plate wheel, chain sprocket, taper bore sprocket, standard sprocket, idler sprocket, ... series.standard sprocket, idler sprocket, stainless steel sprocket,chain sprockets etc