Helical spring, is a mechanical device, which is typically used to store energy and subsequently release it, to absorb shock, or to maintain a force between contacting surfaces. They are made of an elastic material formed into the shape of a helix which returns to its natural length when unloaded Helical springs |Helical springs Small Solid Height |Resonance and vibration is reduced because Helical springs have a uniform pitch and an increasing natural period of vibration (instead of a constant) as each coil bottoms |