We produce tension springs with special loops and hooks, using round wire with a diameter ranging from 0.30 to 3.00 mm.
Tension springs are ideally considered as a rigid body. They have a cylindrical helix subjected to a tensile load acting on the ends of the spring body created from the suitably curved wire.
Loops can be of various shapes, positioned to the inside or outside of the spring body, the angle created between them called "angle between the loops", called α, is important for correct assembly.
Mollificio Brescia has a wide range of raw materials in stock.
The most commonly used from those available are:
Pre-galvanised carbon steel wire: according to UNI EN 102 70/1 standard in SM, SH and DH classes.
Stainless steel wire: according to UNI EN 10270-3 standard type 1.4310, 1.4310 HS, 1.4401 and 1.4568.
Pre-hardened steel wire: according to EN 10270-2 standards in FD, TD and VD classes.
Carbon steel strips annealed or hardened according to EN10132-4 standard.
Stainless steel strips according to EN 10088-2 standard 1.4310 type.
Wires and strips in copper and copper alloys such as brass and phosphor bronze according to UNI EN 12166 standard.
Thanks to our network of suppliers we can offer surface finishes such as: