Types of Springs

Garage Door Torsion Springs

New Jersey garage door company knows the importance of garage door torsion springs, that is why we advice our customers to contact us in case of a broken spring. In New Jersey, the most common garage door repairs are broken torsion springs, however most spring last 10,000 cycles, this means the spring has a life span of 7-10 years maximum. When you have a garage door spring problem call us, because we have the know-how to get it functioning like new.


Above the garage door is a metal shaft secured to a garage door torsion springs. Most people believes that the shaft house the spring, that has not been proven to be wrong anyway. Torsion springs are said to balance the garage door by applying torgue to the shaft with drums at each end. Furthermore, the lift and cycle life is determined by the three characteristics of the garage door torsion springs, they include length, inside diameter and wire size. The lift tells how much door weight the spring can lift, the cycle life tells how many times the garage door should open and close before the garage door spring breaks, lastly the inside diameter measures the hollow diameter of the garage door spring.

Standard Torsion Springs

Torsion springs supply a force when you torgue them or twist them. They are the most common residential torsion springs in the garage door company. Most residential garage doors use either one or two springs, some torsion springs are mounted to the spring anchor bracket in the middle of the shaft above the garage door. If your garage door has an offset mount, it therefore means that the technician did not mount the spring anchor bracket above the center of the garage door, that is why it is advisable to contact New Jersey garage door company for all your garage door spring needs.


If two torsion springs balances the garage door, they are usually mounted to the spring anchor bracket above the middle of the garage door. Having two springs on the garage door tends to make it safer especially if one spring breaks when the garage door is opened. The other spring will then keep the garage door from falling and injuring a person or causing damage to the garage door or other properties. Most garage doors use two or more torsion springs, for example the commercial and industrial garage doors usually use at least two torsion springs, in one or four setups: linear, duplex, triplex or mixed. Don’t hesitate to call our reputable garage door company today.

Linear System: The linear system is commonly used when dealing with wider garage doors through which large vehicles needs to enter. Since these garage doors tend to be wider, four or more torsion springs line up on the shaft with ease. Big industrious companies mostly use this system. Spring and spring hardware makes the linear system less expensive.

Duplex System: The duplex system only has two very large springs, one on each half of the garage door. The duplex system supplies extra torque, and the lift, from the torsion springs without needing the extra space on the shaft as with a wider garage door setup.

The triplex system: The triplex system functions just the same way as the duplex system. In this system there are two torsion springs inside the outer spring.

The mixed system: As the name implies, is the combination of the linear, duplex and triplex system. Mixed system uses more than one set of duplex or triplex springs on each half of the garage door. So when you hire a technician, you have to hire a professional that measures the garage door shaft long enough to accommodate multiple springs, if one of these garage door weighs very heavy, it is sometimes a better option to have multiple pairs of duplex springs sets on the garage door.  Users of the duplex and triplex systems, sometimes finds it very difficult to detect a possible broken inner spring.

Garage Door Extension Springs

Most residential garage doors only have two extension springs, one on each side of the door. However, commercial garage doors have multiple springs installed on each sides. Most extension springs have special clips in the end of the springs, this however allows the spring to be hooked and attached to a part that firmly holds the spring to the door and the garage frame. Extension springs are usually installed on the sides of the garage door, while other garage door users supply a cable which runs through each of the springs.
Sectional Garage Door Extension Springs

Compared to extension springs, the sectional garage door springs are the most common springs in the garage door industry. These springs stretch nearly horizontally over the tracks on each side of the door, running parallel to the side of the open garage door.  The back end of the extension spring connects to an open-eye bolt which therefore connects to the angle iron on the garage frame. The spring uses a wire as a safety cable. Mostly residential garage door s uses two springs, one on each side of the door, one of the springs connects to an open-eye bolt, and this bolt usually fastens to the angle iron that holds to track or the garage door frame.

The other end of the extension spring connects to a pulley with a pulley fork. A pulley attaches to the other end of the extension spring. The end of the cable that goes over the pulley is attached to a cable adjustment clip.

Commercial and industrial overhead doors have an extension setup very similar to residential garage doors. Most commercial garage doors have heavier doors, there are special kits that connect the ends of multiple extension springs, this however allows two or more springs to be stretched simultaneously on each side of the garage door. Most commercial and industrial garage doors don’t have this setup installed that is why it is very important for you to use the services of New Jersey garage door company. Most technicians don’t know the difference, but the difference however, is that the commercial pulleys tend to be a lot stronger and capable of lifting heavier doors without any form of premature breakage.