Everything You Need to Know About Garage Door Torsion & Extension Springs
What Are Garage Door Springs?
Garage door springs are the primary counterbalance components in an overhead garage door system. Although a garage door may weigh hundreds of pounds, properly selected springs store and release mechanical energy to offset much of that weight, allowing the door to open and close smoothly.
Most residential and commercial garage doors use either torsion springs or extension springs. While both systems perform the same basic function, they operate differently and require different methods of identification, measurement and replacement.
Choosing the correct garage door spring involves more than simply matching its appearance. Spring type, wire diameter, inside diameter, overall length, wind direction, door weight and expected cycle life can all play a role in determining the proper replacement.
Garage door spring replacement is common, especially in older homes or garages that are heavily used. Springs are rated by cycles – one cycle being the garage door opening and closing. Depending on how often you perform this cycle, standard springs can last several years, or less with heavy use. Premium springs are rated for as much as 70,000 cycles, giving you years of worry-free service.
Here you’ll find the knowledge you need to choose the right spring for your application, not just the right size, but the right strength for your needs.
Torsion vs Extension Springs
Torsion Springs
Torsion springs are mounted on a shaft above the garage door opening. As the door closes, the springs wind and store mechanical energy. When the door opens, that energy is released to help lift and counterbalance the weight of the door.
Torsion spring systems are commonly used on residential and commercial garage doors and are available in different wire sizes, inside diameters, lengths and cycle ratings to accommodate different door weights and applications.
Learn More: Torsion Springs vs. Extension Springs
Extension Springs
Extension springs are typically installed along the horizontal tracks on either side of the garage door. Instead of winding, these springs stretch as the door closes and contract as the door opens, providing the force needed to help counterbalance the door.
Extension spring systems are common on many residential garage doors and require the correct spring strength and proper safety hardware for the particular door.
How Garage Door Springs Work
Garage door springs are part of a counterbalance system designed to offset the weight of the garage door. Without properly functioning springs, lifting a heavy garage door manually would require significantly more force, and the garage door opener would be forced to handle loads it was not designed to lift on its own.
With a torsion spring system, the springs are mounted on a shaft above the garage door. As the door closes, the springs wind and store mechanical energy. When the door opens, the springs unwind and release that energy, helping lift the door.
The opener moves the door. The springs counterbalance the weight.
The spring system works together with components including the torsion shaft, cable drums and lift cables. As the shaft rotates, the drums control the cables attached near the bottom of the door, allowing the door to travel while the springs counterbalance its weight.
A properly balanced garage door should move smoothly and should not rely on the electric opener to physically lift the full weight of the door.
How to Identify and Measure a Garage Door Torsion Spring
Wire Diameter
The diameter of the spring wire is one of the most important measurements. Because differences between common wire sizes can be very small, wire diameter is typically determined by measuring the length of multiple coils rather than attempting to measure a single wire directly.
Inside Diameter
The inside diameter, or ID, is the measurement across the inside of the spring coil. Common residential torsion springs are manufactured in several standard inside diameters.
Spring Length
Spring length is measured across the coils themselves, excluding the winding and stationary cones. For a broken spring, the two sections can be measured separately and added together.
Wind Direction
Torsion springs are manufactured as either left-wound or right-wound springs. Wind direction is determined by the direction of the coils—not simply by which side of the garage door the spring happens to be installed on.
Important: Measuring a spring tells you the specifications of the spring currently installed on the door. If the existing spring is incorrectly sized or the door has been modified, additional information such as door weight and system configuration may be needed to determine the correct replacement.
How Long Do Garage Door Springs Last?
Garage door spring life is generally measured in cycles, rather than years. One complete opening and closing of the garage door equals one cycle. The more frequently a door is used, the faster those cycles accumulate.
A standard torsion spring may be rated for approximately 10,000 cycles, while high-cycle springs can be designed for significantly longer service life. For example, a garage door used four times per day will accumulate roughly 1,460 cycles per year, while a heavily used door may accumulate several times that amount.
A higher cycle rating does not mean a spring is stronger or automatically correct for a particular door. The spring must still be properly matched to the garage door and its counterbalance system.
Cycle rating is only part of the equation. Corrosion, improper spring selection, installation, door condition and worn hardware can all affect how long a garage door spring ultimately lasts.
Why Do Garage Door Springs Break?
Garage door springs are designed to withstand thousands of opening and closing cycles, but they are wear components and will eventually need to be replaced. Normal cycle fatigue is the most common reason for spring failure, but the actual lifespan of a spring can also be affected by its environment, the condition of the garage door and whether the spring was properly selected for the application.
Corrosion can weaken spring material over time, particularly in humid or coastal environments. An incorrectly sized spring can also place unnecessary stress on the spring system, while worn rollers, bearings, cables and other door components may prevent the door from operating as smoothly as intended.
Learn More: Why Garage Door Springs Break
A broken spring may be the result of normal wear—but premature spring failure can sometimes indicate another problem with the garage door or counterbalance system.
Choosing the Right Garage Door Replacement Spring
Choosing the correct replacement garage door spring requires more than finding a spring that looks similar to the one being replaced. The spring must be properly matched to the garage door and counterbalance system in order for the door to operate correctly.
For torsion springs, important specifications include wire diameter, inside diameter, spring length and wind direction. Depending on the application, factors such as door weight, door dimensions, cable drum configuration, number of springs and desired cycle life may also need to be considered.
When replacing an existing spring, accurate measurements provide an important starting point. However, if the door has been modified, the existing spring appears incorrectly sized, or the previous spring configuration is unknown, simply duplicating the old spring may not provide the correct replacement.
1. IDENTIFY
Determine the spring type and existing specifications.
2. VERIFY
Confirm the spring is appropriate for the door and counterbalance system.
3. SELECT
Choose the appropriate spring configuration and cycle life for the application.
Shop Garage Door Springs
Professional-Grade Springs for Every Application
G.A.S. Hardware supplies garage door springs and replacement hardware for professional installers, contractors and homeowners throughout the United States. Our spring inventory includes a wide range of torsion and extension spring configurations, along with high-cycle options and the hardware and tools needed to complete the job.
Whether you’re replacing a broken residential spring, stocking your service truck or sourcing springs for regular installation work, G.A.S. Hardware makes it easy to find and order professional-grade garage door parts.
Choose from torsion springs, extension springs and commercial torsion springs, with multiple sizes, configurations and cycle-life options available. Professional installers can also find the related hardware, tools and components needed to complete the job.
Shop Torsion Springs
Replacement torsion springs in a wide range of wire sizes, inside diameters, lengths and cycle options.
Shop Extension Springs
Garage door extension springs for residential applications, available in multiple weight ratings and sizes.
Shop Custom Springs
Heavy-duty torsion springs for commercial garage door applications, cut to the required specifications.
Not Sure Which Spring You Need?
Have your spring measurements or door information ready and our team can help you identify the appropriate replacement.
Garage Door Spring FAQ
For a torsion spring, the primary measurements used to identify the existing spring are wire diameter, inside diameter, spring length and wind direction. However, if the existing spring is incorrectly sized or the door has been modified, additional information such as door weight and system configuration may be needed to determine the correct replacement.
Garage door spring life is measured in cycles. One complete opening and closing of the door equals one cycle. Standard torsion springs are commonly rated around 10,000 cycles, while high-cycle springs may be designed for 25,000, 50,000, 70,000 or more cycles depending on the spring and application.
Torsion springs are typically mounted on a shaft above the garage door and work by winding and unwinding. Extension springs are generally installed alongside the horizontal tracks and work by stretching and contracting as the door operates.
Normal cycle fatigue is the most common reason garage door springs eventually fail. Corrosion, improper spring selection, heavy usage, installation issues and worn or poorly operating garage door components can also contribute to premature spring failure.
It is physically possible to replace one spring, but when both springs were installed at the same time and have experienced similar use, the remaining spring may also be approaching the end of its service life. The condition, specifications and age of both springs should be considered when deciding whether to replace one or both.
No. A higher cycle rating means the spring is designed to withstand more opening and closing cycles. It does not mean the spring provides more lifting force or is automatically the correct spring for a particular garage door.
Yes. The wire diameter and inside diameter can still be determined, and the lengths of the broken coil sections can be measured and added together to determine the spring’s overall coil length. The cones should not be included when measuring spring length.