The helical tension spring has hooks on the ends of the windings apart. The hooks are also called eyelets.

For the coil spring traction perform its function, must be stretched, increasing its length. In the resting state, it returns to its normal length.

The helical spring is the most used in mechanics. Generally, the helical spring is made from steel rolled in the form of cylindrical or conical helix. Coil springs can function compression, tension or torsion.