Extension spring, DIN 2097, with two loops, vZn, Ø 1 x 70 x 11 mm

Tension springs are designed to give a specific pull force when extended to a a specific length. Tension springs can be found in garage doors but a trampoline is a better example of this type of spring in action. The primary function of this type of spring is to allow an outside force to create tension then use energy to pull components back together. Tension springs are usually wound very tightly and this spring in a state of rest when it is coiled closely together. If the coils of a tension spring are damaged it will not be able to return to its original state of tension.
Spring tensile with two loops, according to DIN 2097, with an external diameter of Ø 11 mm, body diameter Ø 1 mm, free-state length 70 mm