1) Zero-defect 2) Fatigue Test:>60,000,000 "Shuangdi" series products cover all kinds of Spring and stampings,such as Suspension Spring,Clutch Spring,Valve Spring,Spring for Brake,Steering Sprnig and etc. With engineering staff, we're able to offer design assistance, problem solving, and prototype production. Let us show you why "Shuangdi" is the spring supplier of choice.All kinds of Surface treatment are available,such as Zinc Plating,Chrome Plating,Nickel Plating,Powed Coating,Dip CoatingTS16949,ISO14001,OHSAS18001 Certificated

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