Extension Springs

An extension spring works as the exact opposite of a compression spring that exerts resistance to compressive forces when applied axially. An extension spring will actually absorb and store energy and provide resistance to a pull force. Each extension spring, also known as tension springs, is made similar in geometry. They are typically closed coil wound but the ends are fabricated to accommodate specific design requirements and are usually attached to the source of the opposing force.

Most extension springs are wound with what’s called initial tension. This is the internal force that holds the coils tightly together. The measure of the initial tension is the load necessary to overcome the internal force and start the coil separation. The end configuration is without limits. The most popular are the machine hook, crossover hook, side hook, or extended hook, but the final design will depend on the needs of the application.

Tips for Designing an Extension Spring:

Extension springs can be designed to meet specific needs to fit the application and to function in a manner suited for its purpose. When designing the spring, it is suggested that the engineer spec out no more than three fourths of its maximum working stress level. We would recommend that you consult with our spring engineers prior to finalizing your spring designs. In doing so, this will help to avoid failure of the assembly and potential costly repairs and unnecessary downtime.

Extension springs are used in many different applications and you can typically find them in all major household appliances, medical devices, military/aerospace applications and many more. Contact Rowley Spring today, for all your extension springs or small extension springs requirements.