Torsion spring 1. Materials: Galvanized steel 2.Specification: OEM, wire diameter from 0.2mmto 12.00mm. 3. Precision: according to your drawings. 4.Application:hardware, plastic parts, toy, automobile, electrommunication, lamps and lanterns, clamp, switch, mirror, gift, art ware, molds, household 5. Manufacture Process : Stamping —deep drawing — bending — punching—laster cutting —threading — welding tapping—riveting— grinding. 6.Equipment: Automatic spring coiling machine, torsion spring