I believe this is why I have heard these springs sometimes called tension springs. With our range of quality products we have garnered a widespread export market all over the world. Free length of an extension spring is specified between the inside of the spring loops. In order to meet the varied requirements in terms of quality and design, our machines allow us to make springs from size 0.10 mm to 50 mm at competitive prices. The load needed to separate these closed wound coils is called initial tension.

The same considerations apply here as they do for compression springs. Proclaimed as one of the best in this industry with regards to products and services, our team is well versed and thoroughly trained in every facet of spring manufacturing. This is what is known as initial tension. All extension springs are closed coiled helical springs. Initial tension affects the load/deflection plot as a preload shown in the graphic to the right.

We have engaged ourselves in manufacturing and supplying of a range of products which are highly acknowledged in the export market spread across the world. Today, most hooks, loops, and bends on extension and torsion springs can be made complete on the spring machine. In the body of a helical extension spring the wire is stressed in torsion. To cater to the most diversified demands of precision springs, we, Aditya Industries, specialize in custom springs made to meet the most exacting specifications in the industry today. The spring manufacturer can control this initial tension in his manufacturing process.

Most extension springs have no pitch between the coils. These springs work opposite from a compression spring, which works with a pushing force. Rate calculation formulas used for extension springs are the same ones used for compression springs. This directory contains listings of qualified manufacturers and suppliers dealing in Tension Springs. This type of coil spring could be described as closed wound.

Initial tension is necessary in extension springs to help maintain control of free length.