Tension Springs Also known as Extension Springs are helical wound Coil springs usually designed with hooks, loops, or end coils. The main use of a Tension spring is to absorb or store energy along with creating a resistance to the pulling force, the spring gets stretched as the Load is applied to it.

Tension springs are attached at both ends to other components. When these components move apart, the spring tries to bring them together again. Tension springs absorb and store energy as well as create a resistance to a pulling force. It is initial tension that determines how tightly together an extension spring is coiled. This initial tension can be manipulated to achieve the load requirements of a particular application. Tension Springs are wound to oppose the extension. They are often tightly wound in the no-load position and have hooks, eyes, or other interface geometry at the ends to attach to the components they connect. They are frequently used to provide return force to components that extend in the actuated position.