Steel Rolling Door Torsion Springs

So you have torsion springs on a steel rolling door. To learn more about how your torsion spring system works, jump down to our Introduction to Steel Rolling Door Torsion Springs. The rest of this page is dedicated to helping you determine what torsion spring you need for your roll-up door.

Determine What Steel Rolling Door Torsion Springs You Need:

Learn About Steel Rolling Door Torsion Springs:

Introduction to Steel Rolling Door Torsion Springs

The torsion springs on steel rolling doors work the same way as other torsion springs in the garage door industry. When the door is closed, the spring is wound. The spring is secured to a spring anchor bracket on one end and the shaft on the other. When the steel rolling door opens, the spring in the barrel supports most of the door weight. The chain hoist or the operator lifts the remainder of this weight.

As the steel rolling door opens, the slats wrap around the barrel. Meanwhile, the torsion spring unwinds. When the door is fully open, there is still a small amount of tension in the spring to keep the door from unrolling.

While the door opens, the moment arm (the distance between the center of the shaft and the point on the door that is starting to be wrapped around the barrel) increases. This means that the apparent weight of the door does not decrease as rapidly when it opens. As a result, steel rolling doors typically do not balance well in the middle of their travel. This has to be sacrificed to allow the door to stay down when it is closed and stay up when it is open.

When torsion springs are wound, they grow in length. Since both ends of the torsion springs on steel rolling doors are secured and cannot move, the spring cannot grow in length. There are two options for fixing this problem. You can stretch the spring yourself with a come-a-long before you secure it to the shaft, or you can purchase pre-stretched springs. This allows the coils to be gapped and to lose most of this gapping when the door closes.

Determine What Steel Rolling Door Torsion Springs You Need

It is very important that you order the proper torsion springs for your steel rolling door. The measurements you will need to make must be accurate, or else your door will not operate properly as it did before your spring broke.

How to Measure Your Torsion Spring

There are five characteristics of your broken torsion spring that you will need to determine in order to purchase a new spring. You need to measure the length and wire size of the spring, determine the inside diameter and wind, and identify the type of ends on the spring.

To determine the wire size, you will need to measure the length of 10 coils and 20 coils. If your spring is gapped in order to keep the coils from binding, you will need to compress the coils to make this measurement. You also need to compress the spring to measure its length, which is the distance from the last coil on one end of the spring to the last coil on the other end. You must compress the torsion spring and not include the gap between the broken pieces of the spring to properly measure your spring.

There is usually a marking on the cones of the spring to identify the inside diameter. If this identification cannot be found, you can measure the space inside the coils. Your spring will either be left or right wind. See our Torsion Spring FAQ's to determine the wind of your spring.

Lastly, you will need to identify how the torsion spring is shaped at the ends. There are primarily two types of spring ends for torsion springs on steel rolling doors. The ends of some springs wrap into the spring cones. If this is the case, you will need to order special straight ends and heat the wire to wrap it into the cones. Other steel rolling doors use torsion springs with a loop at each end. If you have this type of spring, you will need to order it with steel rolling door loops.

Visit our DIY Instructions page to learn How to Measure Garage Door Torsion Springs.

Replace One Spring or All of the Springs?

If your steel rolling door has multiple springs, we strongly advise you to replace all of the springs at once. If one spring breaks, there is a good chance that the other springs will break within the next couple of months. Replacing all of your springs at once takes much less time than individually replacing the springs. This will also reduce shipping costs. For more information, visit our Torsion Spring FAQ's page.

Note: If you have multiple springs, you will need to measure each one of them. The springs do not always have the same dimensions, so you will need to determine this for each spring.

How to Order

Once you have measured your old springs, enter the following information into the form below for each spring:

  1. Inside diameter
  2. Wire size
  3. Length
  4. Type of spring ends
  5. Gapped or ungapped

Once you have entered this information, click Go! to find the price of your replacement springs and to place your order. Be sure to select the correct wind when adding the spring to your shopping cart.

PLEASE NOTE: Due to COVID supply chain and manufacturing delays, most steel rolling door springs require eight to 10 weeks for processing. If you can wait that long for your order, please note that in the comment section of your order.

Find My Steel Rolling Door Spring

ID Wire Size Length (inches) Spring Ends Torsion Spring End Help Gapped? Gapped Spring Help
Note: Most steel rolling door torsion springs are not returnable. Be sure to measure your springs properly before ordering!

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YES, WE'RE OPEN FOR BUSINESS! Due to the Coronavirus with the Delta and Omicron varations, we have changed our local order pickup policy at our West Chicago location. To pick up an order you will need to order first. The quickest way to do this is through our online shopping cart. There you can select the local pickup option. Or, you can call 630-293-1337 for assistance and to place your order. When ready, we will call you and your parts will be available for pickup in the front entrance on the north side of the building. Longer items will be picked up on the south side loading dock. Please do not arrive until you have been notified that your order is ready.

COVID / DELTA / OMICRON VARIANT UPDATE! NO MASK, NO SERVICE! When picking up parts please wear a mask. If you don't bring one we'll gladly provide one. Please honor the six foot social distancing rule to protect yourself and our employees. Thank you for your patience and understanding as we all navigate this challenge together. More information is available on our blog titled DDM Adjusts to the COVID-19 Coronavirus.

DELAYS AND INFLATION: COVID has interrupted global supply distribution chains resulting in unprecedented delays on incoming door and dock industry products. The result is limited availability of many products, two to three month delays on incoming shipments, and an inflationary rate of over 100% on most of our products, and 200-300% on many of our core products such as springs and cones.

SHIPPING CHANGES: Shipping times are currently not guaranteed, even on next day and second day shipments. Normal transit times do not apply. Shipping prices on items over 10 feet long have tripled in many cases.

SPRING WIRE AND CONE SHORTAGES: We currntly have a good inventory of 2" ID springs and cones. However, due to cone and wire shortages, we currently do not have cones for the residential 1 3/4" and 2 1/4" ID springs. For these sizes many customers are reusing their existing cones. If you need the larger inside diameter springs for commercial doors, there will be a one to two month delay on your order. If you are willing to wait two months for your springs, please note that in the comment section of your order. We deeply regret the hardships this will create for many of our customers.

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