Tension springs, sometimes known as extension springs, are coil springs, normally tightly-wound, that are loaded in extension And have many different types of ends known as hooks, eyes or swivel loops. In fitting and in function tension springs are stretched or extended and are under tension trying to pull the spring back to the solid position.

Tension springs have an extensive range of uses applied and have many applications, including garage doors, architectural furniture, levers and trampolines.