To fit the function of extension springs, a multitude of hook or loop configurations may be used. Close winding of the body provides initial tension in the spring to help manipulate the load and rate.

At the design stage, the length of the hooks at each end of the spring can be adjusted in order to exactly obtain the required spring load at any extended position. Silencers are often used to prevent vibration within the spring itself as well as eliminating noise in the application without upsetting the function of the spring.

Applications for extension springs include automotive interiors and exteriors, trampolines, washing devices, farm machinery, toys as well as thousands of other uses. Extension springs come in a wide array of sizes, from small medical devices to off-road machinery brake springs.

Many Peterson plants specialize in extension springs using state-of-the-art machinery and world class engineering. Peterson has set itself apart as one of the world's leading spring producers. Our corporate laboratory, as well as individual plant testing facilities, allows us to fully serve every customer with superior manufacturing, testing data and metallurgical documentation.