Process for screw: Cutting stell—Machining—Drill hole—Quenching&Tempering—Machining outside diameter—Milling screw arris—Heat treament—Milling screw arris accurately —polishing —grinding outside diameter—milling spline—Bimetallic/Nitriding— polishing again—Inspecting&Packing
Process for barrel: Cutting stell—Machining—Drilling hole—Rough machining—Hardening&Tempering—Machining again—Grinding inner hole—finish machining—milling feeding hole—Bimetallic/Nitriding—grinding inner hole again—polishing—package
