Torsion Springs

Torsion springs are designed to maintain a rotational pressure between two surfaces. The shape of a torsion spring is a small, coiled section of wire with two sheered and protruding ends.

Generally, torsion springs should be designed to wind the same direction as the coil, which can be clockwise or counter clockwise. Otherwise, their maximum load is considerably lower.

Torsion springs are made in a variety of metals or even plastic, although they typically provide less force than their metal counterparts. These springs are usually wound around a shaft to enhance stability. Although they are made to spring in a reverse direction to their coil, the multitude of torsion spring designs enable them to fit most applications. 

Uses for torsion springs include clothes pegs, spring clamps, small door springs (as might be found in a portable CD player) and motor components.