Extension springs are helical springs designed to resist a pulling force. Load rates are typically expressed in lbs./inch. Wire diameters from .010” to .625” coiled to virtually any outside diameter. Initial tensions from zero all the way up to the maximum allowable by index of coil (wire diameter to mean diameter ratio). End configurations options are endless with the most common being machine hooks. See chart for more options.
Applications for extension springs include automotive interiors and exteriors, garage door assemblies, vise-grip pliers, carburetors, 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.
Configurations: Stock Extension Springs are supplied with full diameter loops (either machine or crossover center) at a random position. Loop openings are approximately one wire diameter and the direction of wind is optional. Extension Springs are available in both Inch and Metric designs. If exact direction of helix is required, Custom Extension Springs can be made to specification. To fit the function of extension springs, a multitude of hook or loop configurations may be specified. Close winding of the body provides initial tension in the spring to help manipulate the load and rate.