the gearbox is used for corn binder(seven gears, one shaft,three chain wheel and one clutch ... , CNC machining, etc.Heat TreatmentAnnealing, normalizing, carbonitriding, carburizing, tempering.StandardISO, GB, JIS, DIN, AGMA and non-standardSurface TreatmentCarburizing, hardening and tempering ... quantityAccept trial order ductile iron gear box for corn harvester/binder machine