A coil spring is a type of mechanical spring typically used to store energy and later release it, absorb shock, or maintain a force between contacting surfaces. It is made of steel material shaped into a helix that returns to its natural length when unloaded.
While the most common use of coil springs is in car suspension systems, they have many different applications, including:
- Torsion springs in computer keyboards
- Bed coils in spring mattresses (valve springs)
- Upholstery and mattresses
- Computer chairs
- Suspension springs used around vehicle shock absorbers
