What are Tension Springs?
Tension springs – or extension springs – are tightly wound coils designed to operate with the force known as ‘tension’. They usually have a loop or hook at either end for attachment purposes.
A typical application for a tension spring is for the likes of counterbalancing garage doors, in farm machinery or on a trampoline. The main function of a tension spring is to allow for an outside force to create tension, and then use this energy to pull the components back together by reverting to its original shape. Tension springs are typically wound very tightly and are coiled closely together when at rest.
How do Tension Springs Work?
Tension springs are used to attach two components and bring them together when they try to detach. The spring stretches to a specific length as the load/force is applied, absorbing energy to create a resistance to the pulling force. In an unloaded position, the loops of the spring are touching.
When the components are pulled apart, usually from either side, the spring tries to hold itself together, causing the spring action until the force is stopped and it can return to its original form.
Most tension springs are wound with an initial tension, this tension is the force which holds the spring coils wound together. The measure of initial tension is the load necessary to overcome the internal force to start coil separation.
Tension Springs from European Springs
At European Springs, we manufacture tension springs that have dimensions of 0.1mm to 26mm and can be created using the hot or cold coiling processes, with both steel and stainless steel. The end types we provide vary from coiled loops or hooks, to screw in fixture attachments. Popular choices include the half hook, extended hook and screw plug.
The initial tension applied to the tension springs can be controlled using the cold coiled process, in which the wire is formed into a spring shape using a computer controlled coiling machine, whilst unheated. Cold coiling gives the tension springs added flexibility which can be more easily achieved than the hot coiling production process.
Of our four categories of specific tension springs in our Spring Catalogue, we guarantee you will find what you’re looking for in the fine to medium spring weight range. However, if you can’t find what it is you need, then please consult with a member of our service team who will help you design a tension spring made to your specific requirements.
European Springs offer variants of close wound and loose wound helices with a variety of possible end types. So, you can customise and combine to make a unique tension spring you can’t get anywhere else.