Extension springs are helical wound coils that usually have hooks, loops, or end coils that are pulled out and formed from each end of the body. The function of an extension spring is to provide extended force when the spring is pulled apart from its original length. When there is no load, The coils of the tension spring are generally tight and there is no gap between the coils.

Extension springs are a type of mechanical spring that stores energy and generates a resisting force when stretched or extended. They are commonly used in various applications, including industrial equipment, automotive components, household items, and more. Extension springs work by exerting force in the opposite direction of their elongation when pulled apart.

Materials of Extension springs

Music wire, alloy spring steel, stainless steel, etc.

Dimensions of extension springs

Outside Diameter, Inside Diameter, Wire Diameter, Free Length, and Extended Length.

Finishes of extension springs

Zinc/ Gold irritate/ Passivated/ Black Oxide/None

Ends of extension springs

The hook types include Machine Hooks, Cross Over Center Hooks, Side Hooks, Extended Hooks, and Double Loop Hooks.

Applications of extension springs

Doors and Gates: Extension springs are commonly used in garage doors, screen doors, and gates to counterbalance their weight and assist in opening and closing.

Automotive: They can be found in car trunks, hoods, and convertible tops to provide the necessary lifting force.

Industrial Equipment:  They are used in machinery and equipment to provide tension and absorb shocks or impacts.

Consumer Products: Items like retractable pens, toys, and adjustable lamps may use extension springs to achieve specific functions.

Agricultural Equipment: They are used in farm machinery and equipment for functions such as tensioning belts and cables.