SINORAY spring steel wires fall into all specifications, both galvanized and ungalvanized. Spring Steel Wire Technical Info: Material: Top quality steel wire rods produced by Anshan Iron and Steel Group 45#, 60#, 65#, 70#, 42A, 62A, 72A, 72B, 82B, T9A, 65Mn Size range: 0.15mm-4.0mm Tolerance: ??.01mm Standards: GB/T 4357, DIN17223, EN10270, JIS G 3521 and so on Application: mechanical springs Packing: according to customers' specific requirements Tensile Strength: As per your detailed requirements. Uses: Spring steel wire is used in bonnel springs , spring mattresses, sofa springs.