Garage door spring selection and replacement

Garage door spring selection and replacement :

garage door spring-replacement


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. 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.

Garage door springs balance the heaviness of the door to make it simple to handle.  For instance, if a garage door measures 100 pounds, a spring power of 100 pounds needs to pull against the heaviness of the door. This can be proficient with springs that either extend or torque, exceptional parts to help with adjusting the door.  There is a huge variety of the garage door springs available in the market. Various factors, which play a vital role in the selection process of the garage are length, wire size, type of end, inside diameter, etc. Though all springs generally have these properties, but all these differences can make a huge difference when it comes to choosing the right type of spring for your garage door.

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. On many commercial and industrial spring systems the spring wire is bent on the ends to secure the cones to the springs. These cones tend to be easier to replace than the screw on type that uses friction to secure the spring to the cones.

Do you need to replace all of the 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.


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.

Dor and Dok systems pride ourselves on always providing you with the most competitive pricing while giving the fastest, friendliest service in the commercial and Industrial door industry, Dor and Dok Systems  every spring repair provides a free safety inspection to make sure all the hardware and moving parts on your door are in good working condition and meet  manufactures safety standards. Regardless of your spring dimensions, lift system, shaft style, spring system, or number of springs we provide the right solution .

Locally owned and operated in Houston, call us today at Phone : [ 512] 814 – 8840.

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