What a torsion spring is

A torsion spring is a type of spring made up of a wire coil wrapped around a central axis. Torsion force is applied to the spring when it is twisted around the axis, and the spring exerts an opposing torsion force. Torsion springs are used in a wide range of applications, including mechanical devices, electronics, and transmission devices.

Torsion springs Typology

Torsion springs in simple or complex form according to request, in round wire, in square or rectangular sections.


Torsion springs in round wire from 0.15 mm to 20.00 mm.


Currently the following materials are being used:

  • Carbon steel wire of classification: SL, SM, SH, DH according to norm EN 10270-1, also in pregalvanised and Bezinal®
  • Oil pretempered steel wire FD, TD, VD Cr-Si according to the norm EN 10270-2.
  • Inox steel wire of types 1.4310, 1.4310 HS, 1.4568, 1.4404 according to the norm EN 10270-3 and of types 1.4301, 1.4539 according to the norm EN 10088-3.
  • Copper alloys: phosphorous brass and bronze according to norm EN 12166

For all of our products, on demand from our clients, we are able to supply treatments for the protection of surfaces, thanks to our vast network of reliable suppliers such as:

  • Epoxide coatings.
  • Cataphorised coatings.
  • Zintek® coatings.
  • Geomet 320®, Magni 565® and all products by Magni, Deltatone®.
  • White and yellow trivalent galvanisation (free from Cr VI)
  • Phosphated to zinc, to calcium.
  • Passivation.
  • Aesthetic nickel and chrome platings, thick chrome, hard chrome, chemical nickel, gold, silver, brass, copper.
  • Teflon coating.

We are also able to carry out internally thermal stress relieving treatments, shot-peening, oiling and washing (both on inox and on carbon with autopassive liquids).

Product data sheet: torsion springs