|Custom Torsion Springs：Single and Double Spring, Chiao Ta Springs custom torsion springs manufactured to your exact needs. When designing, we can manufacture virtually any design. Torsion Spring Production, We use technologically advanced CNC formers to manufacture helical torsion springs. If you wish to test your design with a Rapid Prototype, this is one of the Engineering Services that we offer. Our entire factory is managed to meet the ISO 9001:2008 standard. which we are happy to help you develop.