Our full assortment of extension springs comprises of four different ranges with wire thicknesses between 0,2mm and 10mm. All extension springs are produced in regular spring steel EN 10270-1-SM, and are often also available in stainless steel EN 10270-3-1.4310.
The SF-DFX, SF-DFS range was designed specifically for heavy loads. Coil lengths at 300mm and 1000mm can be cut and used at a desired length.
To determine the spring force at a certain length, multiply the travel in mm ( with the rate (C), and add the intitial force (F0)