High performance forge steel rear axle shaft Surface: as your requirement Usage: Truck, Trailer,Semi Truck,Pickup.etc Manufacturing process: cnc machining / lathe machining / stamping / hobbing Euipment: cnc machining machines , cnc milling machines , stamping machines , hobbing gears Testing equipment: Calliper, micro meter, projector, center-height gauge; ring gauge; hardness testor; centricity testor;microscope, electron microscope; spring force testor; salt spray testor Tolerance:+/-0.05MM