... steel.Heat treatment.CNC machined as per ordered spec Worm ShaftPrecision Worm Shaft with tight diameter accuracy in 303, 316, 17-4 ... Custom precision ground shafts are available in different materials and with retaining ring grooves, bearing journals, flats, special lengths etc ... steel,brass,copper, alloy steel,aluminum,cold rolled steel with various plating;3.Surface treatment: kinds of plating(Zinc, ...