1590 W. Lark Ind. Pk.
Fenton, MO 63026
(636) 677-5500
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Extension Spring: Custom Spring Manufacturing

Extension Spring Design & ManufacturingExtension springs are a type of spring that are designed to store energy and offer resistance to a pulling force. These springs typically have hooks, loops, or end coils that can be attached to separate points and then used to pull the spring apart. Extension springs can be used in a wide variety of applications and are available in many different sizes.

At Wermke Spring, we manufacture a variety of types of extension springs in many sizes and dimensions. These springs are all designed to offer high quality and will meet the specifications of the Spring Manufacturer’s Institute (SMI). To learn more about our extension spring manufacturing services, please contact the experts at Wermke Spring today.

Our Custom Extension Spring Manufacturing

If you require custom extension spring manufacturing in order to meet your specific requirements, our engineers can help. We will work with you using computer aided design software and professional knowledge in order to help design the best extension spring to optimize performance of any application. We can even provide a prototype to ensure that performance expectations are met.

Extension Spring Design

Whether you need only one or a few springs or you require millions of springs in a custom style, we can supply the springs to meet your needs. For a price quote for your extension springs or to work with our engineers to develop the extension springs that meet your requirements, please contact us or complete the form on this page.

More About Buying Extension Springs

Extension springs are helically wound and made from tightly wrapped coils that create a tension. These springs have some type of hook or loop at each of the ends, which are typically attached to different components. Then when these components move apart, the extension spring absorbs and stores energy and provides a tension or pulling force to pull these components back together. The initial tension of the spring determines how tightly the spring is coiled. This tension can be manipulated during manufacturing to achieve the load requirements of a particular application.

Types of Extension Springs

Extension Spring Configurations

Order Custom Extension SpringsThere are a variety of ends that can be used when configuring and designing extension springs. The most common configurations used for extension springs are full loops and crossover hooks, because these can be made with standard tooling and minimal cost. Other options for extension spring end configurations may include:

  • Threaded Inserts and Plugs
  • Reduced or Expanded and Extended Hooks or Loops on the Side or Center of the Spring
  • Hooks at Varying Positions or Distances from the Spring Body
  • Different Shapes such as Rectangular or Teardrop-Shaped Loops

When designing extension springs, it is important to remember that most extension spring failures occur where the hook meets the body of the spring. Therefore, to maximize the life of the spring, the path of the wire should be smooth and gradual as it flows into the end. Additionally, stress in the hook/loop area should be held to a minimum, with a bend radius not less than 1.5 times the wire diameter. For additional hook configurations, please contact us.

Extension Spring Applications

Extension springs can be made to fit nearly any specifications and can be used for a wide variety of applications. This includes for:

  • Industrial Equipment and Machinery
  • Manufacturing Processes
  • Aerospace Industry
  • Automotive Interior and Exterior Components
  • Farm And Off Road Machinery
  • Medical Devices
  • Garage Door Assemblies
  • Hand/Power Tools
  • Sporting/Athletic Equipment
  • Appliances
  • Toys

Order Custom Extension Springs

If you would like to learn more about our ability to manufacture custom extension springs for your intended application, please contact us. You can complete the form on this page to provide us with your specifications and requirements in order to receive a quote for your specific spring needs.

FREE Quote

Mandatory Specifications

in. +/- in.
in. +/- in.
in. +/- in.
4. Load
lb. +/- lb.  @ in.
5. Rate
lb./in. +/- lb./in.
6. Max. extended length (inside ends) without set
7. Relative loop position
degrees max separation of loop planes.
8. Direction of helix
9. Type of ends

Special Information

1. Type of Material
2. Finish
3. Frequency of movement (cycles/sec)
4. Operating temp
degrees F

Advisory Data

1. Wire diameter in.
2. Mean coil diameter in.
3. No. of active coils
4. Body length in.
5. Initial tension in.
6. Type of Hooks
7. End use or application
8. Other Information

Personal Information

Company Name
*Contact Name
Phone #
Fax #
*Security Code: captcha
You may submit this form electronically for a price quote.