A double torsion spring consists of two single torsion springs connected by a central section, working together to provide equal torque in both directions. This design ensures improved stability, uniform force distribution, and enhanced durability for complex mechanical applications. These springs are often used where bi-directional rotational energy or balanced torque output is needed. double torsion spring manufacturer custom double torsion springs double torsion spring supplier stainless steel double torsion spring precision double torsion springs heavy duty double torsion spring manufacturer industrial double torsion springs double coil torsion spring manufacturer