Extension Springs

Extension Springs

The anatomy of an extension spring installation on a garage door

Designed to counterbalance a garage door, extension springs stretch to easily open or close a garage door. Extension spring systems are installed vertically on either side of the garage door or horizontally along the overhead tracks. 

Characteristics of Extension Springs

Extension spring with pulley fork cable.


Build custom torsion and extension springs for nearly any job in the garage door industry.

A properly engineered garage door spring, complete with the appropriate hardware, makes lifting garage doors simple. Use the custom spring builder online to create made-to-order torsion and extension springs from SSC.

Customer Torsion Springs

Custom Torsion Springs

Galvanized, Oil or Powder Coated

Custom Extension Springs

Clipped Ends, Double or Open Loop

Custom Duplex Springs with cones

Custom Duplex Springs

Engineered for Small Spaces


Counterbalance the garage door using the pulling force of custom or in-stock extension springs.

Extension springs or stretch springs, lift a garage door by creating energy when the door is in a closed position and the spring is extended. The extension springs then use the stored energy to pull the garage door open. They are installed vertically along both sides of the garage door or horizontally above the track system. Extension springs are color coded to help you know the pull-force of the spring when stretched.

Pulley Extension Spring
SSC Spring Engineering App

Download the garage door industy’s leading spring engineering mobile application for Apple & Android.

This is our original torsion spring rate book converted into an easy-to-use mobile app. Easily convert and engineer springs, compare drums and more. Download our free app today!




Spring IPPT

Springs by IPPT

Weight Calculator

Weight Calculator

Garage door replacement Parts

An extensive selection of garage door replacement parts, operators and tools for the overhead door industry.

LiftMaster Contractor, Premium and Elite Series Operators

Operators & Parts

Discover the best garage door openers on the market by today’s top brands. From construction grade to integrated or smart-home operators, you can find the model that meets your needs and budget.

Garage Door Replacement Hardware

Garage Door Hardware

Whether you’re seeking stylish powder-coated hardware or a classic set of hinges and rollers, our selection has products for all garage door repairs or replacements – including cones, cables, drums, brackets and fasteners.

Garage Door Struts

Long Steel Products

Perfectly designed for use in the overhead door industry, long steel parts – including perforated angle, track, shaft and struts, provide remarkable support and flexibility for garage door repairs and replacements.


The industry expert in garage door torsion and extension spring manufacturing since 1962.

As a manufacturer of garage door springs, we offer a wide variety of in-stock and custom made torsion and extension springs. Choose wire sizes from .1250 to .6250 for nearly any overhead door application. Plus, we offer a variety of unique wire materials and finishes: square, galvanized and powder coated, for special-use cases or homeowner upsell potential.

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Offer valid 11/20 – 11/22/23. Multiple orders will be totaled and gear awarded on final invoice total. To qualify invoice must meet minimum total less freight and/or taxes. All items shipped to address on file in 6-8 weeks. While supplies last. Promotional items subject to change without notice. No prize customization. Promotional items shipped to US addresses only. All items imprinted with SSC. Phone orders available Monday, 11/20-Wednesday, 11/22. Account must be current and in good standing to qualify. Additional restrictions may apply.