... Parts & Machining Parts Product Line Gearbox 1,000 Pieces / Month, Gear & Worm Gear 4,000 Pieces / Month, Valve 800 Pieces / Month, Welding ... Parts 800,000 Pieces / Month Gearbox 5,000 Pieces, Gear & Worm Gear 40,000 Pieces, Valve 5,000 Pieces, Welding Structural 200 ... Acceptable Hardness Tester HR-150A 1 3.0 Acceptable Production Flow: 1.Saw Cutting 2.Stamping 3.Stretching 4.Welding 5 ...