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Ryan Hughes
Ryan Hughes

Buy Extension Springs


An important factor to keep in mind when determining whether your order of extension springs is in bulk or not, is the size. For example, if you buy 1 extension spring with part number PE148-1000-6378-SST-2500-CO-N-IN they would cost you around $55.72 a piece. On the other hand if you buy 50 extension springs it would cost you around $13.77 a piece, because the more you buy the more you save. 250 extension springs with part number PE148-1000-6378-SST-2500-CO-N-IN would cost you $6.06 a piece. It gets better 1000 extension springs with this part number would only cost you $3.31 a piece, thats a 94% saving. The price per piece for bulk extension springs will always be lower than the retail price. This is what makes it a much better option for bigger projects because it saves you money and assures that you stay within budget.




buy extension springs



When it comes to shipping your bulk extension springs, we have several options. One very common shipping option selected by our clients is layered springs. With this option the springs are placed side by side on a sheet to form a layer and then a second sheet is placed on top of them to form another layer of springs and so on until the order quantity is completed. We also have other packaging options available for your bulk extension springs based on your needs and the spring size/quantity. Special packing options are offered at an additional cost to save you time by preventing the springs from tangling or losing their shape. Since we know it can be difficult to untangle your springs and sometimes it can even damage some of your springs. If you need special packaging or additional protection, we can work with you to find the most viable solution. Don`t hesitate and get your bulk extension spring order placed today. Contact us to learn more about our packaging options, bulk orders, and other special pricing.


On this page, you can learn more about extension springs, determine which replacement extension springs you need, and see how to order springs. These springs are for sectional garage doors. If you have a garage door that does not bend as it rolls up into the horizontal tracks, if it is one rigid piece that pivots, go to our One-Piece Garage Door Extension Springs page.


Sectional garage doors are hinged, and they bend in the tracks as the door opens and closes. Many of these doors are counterbalanced with extension springs, also designated "stretch springs," and they have seven characteristics. The length is the measurement of all the coils pressed together. This, along with the inside diameter of the coils and wire size - the thickness of the wire from which the springs are made - determine the stretch, the distance the spring is extended - normally half the door height, and pull, the force the spring pulls when stretched its normal length. The type of ends determine how the ends of the spring are mounted. The initial tension is the percentage of pull needed to separate the coils. This is determined by the pitch with which the springs are wound. On sectional garage door springs, this normally is 15 percent. For example, a 100-pound pull spring requires 15 pounds of weight to separate the coils; when a door is open, the two springs will support 15 pounds of door weight without any stretch.


Garage door extension springs counterbalance the weight of garage doors to make them easy to open and close. One end is secured to a stationary angle or bracket, and the weight of the door pulls the other end.


When a garage door is open most of the door weight is stored in the horizontal tracks. The door will stay open without extra support because the initial tension of the springs counterbalances the weight of the door. Extension springs are stretched with cables and pulleys. One end of the cable attaches to the bottom of the door; the other end of the cable is usually secured to the horizontal track angle with an s-hook. As the door closes, one end of the cable follows the bottom of the door; the remainder of the cable runs over the pulleys above the door, onto the horizontal track angle where it is normally secured with a cable clip and an s-hook. (For demonstration purposes, the spring is extended from the ceiling, but it is normally suspended from the rear track hang.)


On the 100 pound door in our example above, there is one extension spring for each side of the door. Each spring pulls 100 pounds on the pulley, but the cable on the bottom of the door lifts only 50 pounds. This is because only half the tension from the spring is transferred to the door; the other half of the spring tension is transferred to the other end of the cable, where it is secured to the horizontal track angle with a cable clip and an s-hook. As a result, the 100-pound door in our example needs a 100-pound pull spring on each side of the door. Notice also that the spring stretches from 25" to 67 inches. This difference of 42 inches - half the door height - is the spring stretch.


This spring would be designated 25-42-100 because it is 25" long, it stretches 42" beyond the 25" length, and the 100 is for the 100 pounds of pull on each spring. Thus, for a seven-foot high garage door that weighs 100 pounds, the door would require two of these 100-pound pull springs.


Quite often, the loop breaks off the end of an extension spring. There are two options for fixing the spring without replacing it, or for making your door operational until springs can be ordered. One is to separate the last two coils with a screwdriver and attach the s-hook or eye bolt.


The other temporary fix is to install a clip at the end of the spring. You can buy these at our extension spring hardware page. Bear in mind that these are temporary fixes. You can expect your spring to break again at the other end or another place along the length of the spring. The only reliable repair is to replace both or all four springs.


It is important that you replace your old extension springs with new springs that will properly match your door weight. This will provide you with a properly balanced garage door, one that will stay on the floor when it is closed, stay halfway, and stay up when you open the door. The blog is written for torsion springs, but testing the balance of a door is the same for both systems. Broken pulleys and cables frequently accompany broken extension springs, so you may have a slightly bigger project on your hands that you anticipate.


There are three important pieces of information that you will need to get in order to select the proper springs for your garage door. These are the door height, the spring length without the loops, and the door weight. If you can identify the manufacturer and model number you may not need to weigh the door. Just click the "Find by Model Number" tab below.


One method for weighing a 16' or wider door is to slide your scale under the end of the door on the side that has a broken spring. Raise the other side to the same height and then support it to keep the door level. The door weight can be difficult to calculate. You must use an analog scale, as most digital scales do not respond to changes in the door weight caused by the door binding in the tracks. If you have two broken extension springs, slide an analog scale under the center of the door to get the total weight. If one of your two extension springs is broken, you can slide the scale under the door under the side with the broken spring as pictured to get half the weight.


Shake the door and check each of the rollers for binding. If one spring is broken, the weight you read off the scale at the broken will be 1/2 the door weight. If you have a total of two springs on your door, and if both springs are broken, the scale will read the total door weight. For more information, see the first five steps of our Extension Spring Replacement tutorial.


If you have a total of four springs on your door with two springs on each side of your door, open the door, remove the second spring on the side with the broken spring, and lower the door onto the scale on the side that had the broken spring. With both springs off on this side, you can double this weight to determine your total door weight. It is important to note, however, that since you can't weigh the door at the very end, you will need to adjust your weight to factor in the distance from the end. For example, if the center of your scale is 12" from the very end, you will need to add to the weight your scale shows. A percentage determined by dividing 16' by 15' arrives at 106.66% percent. Hence a weight of 100 pounds X 106.66% = 107 pounds. Double this, and the total estimated door weight should be around 214 pounds. This door would use two 210 pound lift extension springs. Or, if the door has four extension springs, the door would use two 100 pound lift springs and two 110 pound lift springs.


The door height also helps to determine which springs you need. For example, the extension springs made for 14' high doors are intended to stretch twice as far as the springs made for 7' high doors. As a result, the un-stretched length of an extension spring generally increases as the door height increases.


Another measurement you will need to make is the un-stretched spring length, not including the ends. Extension springs tend to stretch over time, so you will need to remove the spring from the door and compress the coils when measuring the length. You may need to insert a shaft in the middle of the spring to keep it straight while compressing the coils. Some springs are ruptured so badly you may need to measure and count coils to calculate the length.


If you decide to purchase an extension spring with a shorter un-stretched length than your old spring, you will need to adjust your cables. There will need to be 2" of additional length for every inch that your new spring is shorter than the old spring. If your cables are not adjustable or are too short, you will either need to replace the cables or order a longer spring. If you need a spring with dimensions not listed in our parts catalog, we can order a custom spring. These generally cost about 50% more than our standard springs, so it is probably better to change the cables instead. 041b061a72


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