... under high stress. Detailed Information About the SpringMaterialStainless steel, carbon steel, spring steel, alloy spring steel, refractory steel, brass, bronze, etc Load type compressionFinish Zinc- ... by customer.Certification ISO9001:2008 ,ISO14001and ROHsEquipmentsAdvanced CNC computer spring machines with high precision and efficiencyTechnology Experienced engineers ,technicians and Skilled ...