Extension springs are made to absorb and store energy by creating a resistance to a pulling force. All coils are active in these springs, and it is the initial tension that holds the coils together tightly. The extension spring ends include threaded inserts, extended twist loops, cross loops hooks, rectangular ends, etc. All spring ends can be produced with varied in distance from the spring body. The production capabilities for the extension springs fulfill almost any client need, from a standard cross center hook to a special purpose extension spring, such as a stove spring, used on oven, doors, with extended hook ends. The extension springs are most often produced using round wire and customized wire. Material size ranges from 0.30 mm to 3.0 mm. Also manufactured are coil springs, wireforms making use of materials, such as spring steel, high carbon steel, nickel plated carbon steel, stainless alloys, etc. Helical extension springs store energy and exerts a pulling force. Usually they are made from round wire and close-wound with initial tension. Typical applications include cassette players, balance scales, toys, garage doors, automatic washing machines and various types of spring tensioning devices.
