Commercial and Industrial Torsion Springs

Commercial and Industrial torsion springs

Commercial and industrial overhead doors range from weighing a few hundred pounds to over a thousand pounds. Vertical-lift and high-lift door systems are frequently used in commercial and industrial settings to maximize space. Read below measure your old spring(s) and find your new torsion springs to purchase.

Introduction to Commercial and Industrial Torsion Springs

Commercial high lift overhead door
Commercial high-lift doors open vertically before rolling backward.
Commercial and industrial torsion springs are used in warehouses, loading docks, and a variety of other locations that require large overhead doors. Because of the wide range of applications, door sizes and therefore door weights, the torsion springs on commercial and industrial doors vary greatly in size and lift.

Commercial vertical lift dock doors
Vertical-lift doors open straight up.
Depending on the application, commercial and industrial doors come in a variety of lifts, including high-lift and vertical-lift. High-lift doors are a common way to utilize space as they raise the door closer the ceiling before rolling back on the horizontal tracks. These doors have a special drum that take several turns of cable to increase the moment arm as the door opens vertically. When the door rolls back on the horizontal track, the cable reaches the flat portion of the drum and mechanically behaves as a standard lift door.

Vertical-lift doors, on the other hand, open straight up and do not roll back. These doors are especially useful in maximizing space in taller buildings, especially warehouses where forklifts move large quantities of products.

Commercial springs often use two brackets because of a coupler
Top: A split shaft with a coupler requires two spring anchor brackets.
Bottom: Other doors use two brackets without a split shaft.
Commercial and industrial torsion springs mount to spring anchor brackets. While some doors only require a single spring anchor bracket like the vertical-lift door pictured above, others utilize multiple spring anchor brackets. Multiple brackets are almost always required when multiple springs are used on a split shaft as both springs typically do not fit on one half of the shaft. Wider doors often use multiple springs in a linear system, thereby requiring the outside springs to use additional spring anchor brackets.

Single, duplex and triplex springs are all utilized in commercial and industrial environments. By fitting a spring with a smaller inside diameter inside of a spring with a larger inside diameter, the springs work in conjunction with each other and require less space on the shaft. One disadvantage of the duplex and triplex systems is that broken inside springs (as pictured at the top of this page) are often undetectable without weighing the door. Furthermore, measuring the dimensions of an inside spring is more difficult as it requires unwinding the outside spring and removing the cone before any measurements can be made.

Regardless of your spring dimensions, lift system, shaft style, spring system, or number of springs, you can order replacement torsion springs for your commercial or industrial overhead door.

Purchase Commercial Torsion Springs

After measuring your old torsion springs, determining which springs you need to replace, and considering longer life spring options, you can place your order for commercial torsion springs.

Measuring Old Torsion Springs

There are five characteristics of torsion springs: 1. Inside Diameter (ID), 2. wire size, 3. length, 4. wind, and 5. end types. For each torsion spring you plan on replacing, you will need to obtain each measurement.

Each measurement must be made carefully for your to receive the proper replacement springs. See our How to Measure Torsion Springs page for more information on obtaining these dimensions.

To measure springs on the inside of duplex or triplex systems, you will have to first unwind the spring system and remove the cones to access the internal spring.

Replace All of Your Torsion Springs?

Torsion springs are rated for a specific number of cycles based on the number of turns that are applied. Since springs on a door are typically rated with a similar cycle life, we typically suggest that you replace all of the springs on your door together. Because of the relatively high cost of replacing the springs and the subsequent loss of possible cycles from the old springs, many customers decide to only replace one spring at a time.

Ultimately, the decision is up to you - you can replace all of your springs at once and save time on the labor, or you can replace all of the springs on your door at once.

Longer Life Torsion Spring Options

Commercial cable drum
This high-lift cable drum says APCO 5750-120. Many cable drums are covered in paint, dirt, or other substances which make it difficult to read the label.
Please contact us if you are interested in purchasing springs with a longer cycle life. We will need your current spring dimensions, cable drum number, door dimensions, and possibly other measurements in order to provide you with possible cycle life upgrades.

Torsion spring upgrades are based on matching the torque rating per turn (IPPT) of your current spring to a new spring or by finding the necessary IPPT based on your door and cable drum. Increasing the cycle life is accomplished by increasing the wire size. In order to maintain the same lift as with your old torsion spring, your new spring will require a greater length of steel. This increase is accomplished by either increasing the length of your spring or by increasing its inside diameter.

The space on the spring shaft often becomes a limiter for torsion spring upgrades. A longer cycle life spring often requires more space on the shaft and therefore may not be an option based on your current system. If you do not have a duplex or triplex system, upgrading to such a spring design may give you the space you need.

If you wish to upgrade the cycle life of a duplex or triplex system, you will need to replace the internal and external springs simultaneously. If you do not, you may not be able to reassemble your spring system with your upgraded spring.

USA Made Steel

In recent months, there has been a rising concern about the type of steel used in springs. For example, Chinese imported steel and springs are often more brittle and can therefore be of a lower quality than other sources. At DDM Garage Doors, we make it our primary concern to not only help people figure out how to repair their doors, but also to provide excellent products for our customers. Therefore, if you purchase a spring from us, you can rest assured that all our springs are made with high-quality steel from the United States.

Order Commercial Torsion Springs

WARNING! Replacing torsion springs is dangerous work, even for experienced tradesmen! Springs are normally under extreme tension. Damage to property and loss of fingers, limbs and life can occur without following proper procedures or without using the right tools. DDM Garage Doors wants your business, but not at the expense of your safety. If you have any doubts about your ability to perform the work safely, we recommend you hire a professional to do the work.

Before ordering your springs, be sure you have measured them correctly as most commercial and industrial torsion springs are not returnable.

Volume Discounts:

Spring discounts are based on the total weight of the spring order.

  • Prices listed are for torsion spring orders under 250 pounds.
  • For orders that weigh between 250 and 500 pounds, deduct 5%.
  • For orders that weigh between 500 and 750 pounds, deduct 10%.
  • For orders that weigh between 750 and 1,000 pounds, deduct 15%.
  • For orders that weigh between 1,000 and 2,000 pounds, deduct 20%.
  • For orders that weigh between 2,000 and 3,000 pounds, deduct 25%.

If you are looking for torsion spring hardware, see our torsion spring hardware prices.

Select the inside diameter of the spring you need. After determining the price for the spring length that corresponds to your wire size, contact us to place your torsion spring order.

1 19/32" 1 5/8" 1 3/4" 1 13/16" 2"
2 1/8" 2 1/4" 2 7/16" 2 1/2" 2 5/8"
2 3/4" 2 25/32" 3" 3 1/8" 3 3/8"
3 1/2" 3 3/4" 3 25/32" 4 1/8" 4 3/8"
4 1/2" 4 7/8" 5 1/8" 5 1/4" 5 1/2"
5 3/4" 5 7/8" 6" 7 1/4" 7 3/4"