Material:aluminium,copper alloy 45# steel,40Cr,42CrMo,L6 or according to customers request Surface:anti- ... , Close Die forging, Open die forging, Cold forging, Upset forging 2) Materials: Aluminum, copper alloy 45# steel, 40Cr, 42CrMo, L6 or according ... , milling machine, grinding machine, planer...etc. 2) the hightest machining precision can reach Ra 0.6 3) the hightest machining tolerance ...