... , 14001, TS16949, 13485 Product scopeCompression Spring, Extension spring, Torsion Spring,Coil spring, suspension spring, etc.MaterialCarbon spring steel, alloy spring steel, stainless steel, high temperature Resisting ... heat treatment and etcApplicationsAll kinds of cars, machinery, home appliance, electronic products, electric appliance, cameras, computers, power switches, architecture, furniture, ...