Stock Extension Springs - Over 4,000 Different Designs

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Stock Extension Springs Definition

Helical coils wound together one on top of the other without pitch in between to conserve energy and eject a force once a load is applied on the spring. Once a load is applied, the stock extension spring will be pulled to an extended length.

The Spring Store by Acxess Spring offers more than 4,000 stock extension springs which you may search through using our Online Stock Extension Spring Finder. To do a basic search through our extension spring catalog, you will only need to know your extension spring's outer diameter and its length inside hooks. These measurements may be entered either in the english or metric systems. In case that you are more familiar with your extension spring design you may also do an advanced search where you are additionally able to input one or more of the following to narrow down your search:

  • -material type
  • -wire diameter
  • -travel required
  • -initial tension
  • -rate
  • -load

For information on how to measure your extension spring and how to distinguish certain extension spring dimensions, please see the diagram below.

How to Measure Your Stock Extension Spring

In case you find several stock extension springs that may work in your application but don't know which one to purchase, you may compare them by clicking on the "Add to Compare" button and these items will then be added to the "Compare Products" section at the bottom of your screen. Once the items are at the "Compare Products" section, simply click on the option and your extension springs' information will come up side by side for you to get a cleaner comparison of them.

In The Spring Store, customers also have access to our famous online extension spring calculator tool, "Spring Creator". Our free online spring calculator offers live blueprints of your spring along with accurate full spring analyses. Here you may work everything that has to do with your extension spring design from physical dimensions to load, rate and travel including warnings and tips when it comes to functionality.

For testing and prototyping, purchasing stock extension springs is your best option. This is because running a small batch of several different extension springs means several different extension spring manufacturing set ups which implies several manufacturing set up charges. When buying stock extension springs at The Spring Store, you may buy small quantities of different extension springs without the additional manufacturing set up fee.

We also offer several additional characteristics to our stock extension springs which include the variations of material (or wire) types, type of hooks, and several plating (or finish) options. Material types include Music Wire (or Spring Steel), Stainless Steel 302, Hard Drawn, Beryllium Copper, Oil Tempered, and Phosphor Bronze. Our various hook types include Machine Hooks, Cross Over Center Hooks, Side Hooks, Extended Hooks, and Double Loop Hooks. Plating (or finish) options are usually provided for Music Wire (or Spring Steel) or Hard Drawn wire. These include Zinc plating, Black Oxide plating, and Gold Iridite plating.

Different Hook Types for Stock Extension Springs

Cross Over Center

extension spring with cross-over-center hook type

Double Loop Hooks

extension spring with double-loop hook type

Extended Hooks

extension spring with extended hook type

Machine Hooks

extension spring with machine hook type

Side Hooks

extension spring with side hook type

At the top of the our spring finder page you will also find the option to look at the entire stock extension spring catalog through our site. You will also find the option to download our entire stock extension spring catalog in pdf format for your reference and perhaps a better view of what we have to offer.