extension springs

The design of an extension spring has many components that are unique to its build. There is a lot to consider when creating your spring, but our experts are here to make it easy for you.

About Extension Springs

Extension springs are different from any other mechanical spring because they are designed to remain compressed; the coils naturally want to remain together. It takes a force created by a load to separate the coils, rather than compress, tighten or rotate them.

Designing an Extension Spring

Besides your choices in wire materials, wire diameter, and wire finish, which are present in all designs for all springs, there are many design factors that must be taken into consideration for extension springs. These include:

  • Initial tension: the initial tension of an extension spring is the tension that is already present between the coils. It is the internal force that keeps the coils held together. The initial tension you require will be based on the force that will be applied to the spring by the load. The greater the force that will be applied to the spring, the greater the initial tension will need to be in order to prevent the spring from failing or becoming damaged.
  • End/Hook Opening: unlike compression springs, extension springs can be customized to have a large variety of hooks, loops and other types of openings. Learn more about spring end types.
  • Body length: body length is the length of the extension spring (not including the hooks/loops on the end of the wire. The more coils you have in your spring, the greater the body length will be.

What Are Your Extension Spring Needs?

At The Yost Superior Co., we have the capability to create extension springs that match your precise specifications. We can achieve nearly any length, bend and shape of wire, giving you the best fit for your product or application every time. Get in touch with us today to tell us about your extension spring needs. You can even fill out this form to get a free quote on your spring order.