These springs react to a moment of torsion around their own longitudinal axis.
Torsion springs are made of a round section wire, helically wrapped around an axis. They differ from other springs in that they have stems applied to their ends that provide a torsion and are recommended when there is the need to provide an angle twist between two components of a device.
Torsion springs can be made with the most complex geometrical shapes and stems in order to be adapted to different uses in a great variety of sectors as well as in the most technologically advanced devices.
They can have a single or double winding, the latter has two separate bodies joined by one central tang.
Mollificio Italiano produces single or double torsion springs.