Extension Springs

Extension Springs are close-coiled helical springs designed to resist an axial pulling force. Extension Springs or tension springs stretch from free length to a longer extended length to store energy, and offer resistance or provide a restoring force to a pulling force between two points.

Most extension springs are manufactured from round wire and are close wound with initial tension which offers a small deflection load for secure installation. You can design an extension spring with open wound coils when zero initial tension is required or when the spring needs to perform as an extension and a compression spring for the same application. Optimum Spring Solutions manufactures custom extension springs in different lengths and degrees of tension to suit your specifications.

End Configuration :

Various types of ends are used to attach the extension spring to the source of the force.

Common Extension Spring ends we manufacture are:

  • Hook: crossover center, extended, full round, machine
  • Loops: side, single full, double full
Wire Diameter :

Our wire range for Extension Springs is 0.25mm to 10mm in diameter in round. Automatic Coiling: 0.25mm - 2.50mm. Hand Coiling: 3.00mm - 10.00mm

Wire Material :

Round wire is most commonly used for extension springs because it is most adaptable to standard coiler tooling. The most common materials we use to manufacture extension springs are Carbon Steel, Stainless Steel, Phosper Bronze, Brass, Beryllium Copper, Other Materials to Special Orders.