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Ext Spring Instructions

  • 1. Spring weight rating.
  • 2. Spring stretch This is written as a number like 25X42. The "25refers to the unstretched spring length. The "42" is the maximum spring stretch.


 For additional information on spring color charts and determining the rating for a spring, scroll down or call toll free 1-888-952-DOOR (3667) or email us. 

Caution:    Garage door springs are under extreme tension!!  We recommend repairs, adjustments & removal to the springs or any working part of the garage door to be made by a qualified door technician. Any attempts to repair, replace, adjust are done at your risk. We are not responsible;which includes any advice given; for injuries, death or damages of any kind.

To figure out your spring rating, check the color coding on your old springs and use charts below to order. Caution:  Most extension springs have been color coded using the Official Color Codes for Extension Springs by DASMA (Door and Access Systems Association International). Most major garage door manufacturers use Dasma. Check with your garage door manufacturer to make certain they use these color codes.  

Color codes are in increments of 100 Pounds. Example: Red could be a pair of springs for a 50,150 or 250 pound garage door. If you are not completely sure of the color code on your old spring use the measurement formulas below. 

There are three important measurements that you will need to make to order the proper springs for your garage door. These are the total door weight, the door height, and the spring length.

First you must start by weighing the door.

Use extreme caution when using the procedure below. We are not responsible for any injuries or damage to property. If you are weighing a single car door, you must  have at least 2 Strong people helping. On a double car garage door, you'll need at least 3 people. Each person should know before hand what's involved in lowering the door and injuries that could occur if lowering door improperly. (Never bend your back when lowering or lifting.)

Before using this procedure, check your track to make sure that they are straight (no bends or kinks) and that the rollers are rolling properly and in good shape. Also check your hinges to make sure they are not broken or damaged and working properly because you and two helpers will be lowering the door by hand. If there is a problem with the track, rollers or hinges then the door will not come down evenly. If one side of the door is lowered faster than the other side of the door, the door could get jambed or bind in the track or worse fall off the track.  A precautionary measure would be to spray your rollers and track with a light oil (WD40 or JB80). This will help ensure that the door comes down level. 

1. Weigh your door


a. To weigh your door, raise door completely.

 Fasten "C" clamps or vice grips under bottom rollers to retain door.

 Remove the lifting arm of the garage door opener and disconnect the power.



b.  With tension completely off extension springs, disconnect springs from track support.


Garage doors are very heavy and require at least 2-5 very strong people to lift and lower door.

c. Position your helpers under the garage door; in exact increments.The first person should be 2-3 feet from left side of the door. The second person should be near the middle of the door and the 3rd person should be positioned in the 3rd increment or 2-3 ft from the right side of the door.

d. Have the person on the left and right of the garage door remove the "C" clamps or vice grips simultaneously while holding the garage door from coming down and lower door by hand.

* Note that entire weight of door, which could exceed several hundred pounds, has to be lowered slowly and level. All helpers should know to lower the door evenly by hand. Do not put your fingers in between the sections of the door as injury to hands and fingers could occur.  Grab the steel struts or handles when lowering; never hold the door between the sections.

e. Set bathroom scale to zero and place under center of door and record door weight.Make sure the garage door is completely balanced on the scale.The garage door should not be leaning on the track.

 If door weight exceeds capacity of the scale, use 2 bathroom scales.

f. Add a 2 x 4 with one end on one scale and the other on a second scale with the door perpendicular to the 2 x 4. Add the respective weight from each scale together to get the total weight of the garage door.  Now you have determined the weight of the door.

2. Measure the height of your door

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 unstretched length of an extension spring generally increases as the door height increases.

  • 7 ft high doors require 25" x 42" extension springs.
  • 8 ft high doors require 27" x 48" extension springs or 32" x 48" extension springs 
  • 9 ft high doors require 36" x 54" extension springs.
  • 10 ft  high doors require 44" x 60" extension springs.
  • 11 ft high doors require 48" x 66" extension springs. 
  • 12 ft high doors require 53" x 72" extension springs.

The spring stretch is written as a number like 25X42. The "25" refers to the unstretched spring length. The "42" is another indicator that this is for a 7' high door.

3. Measure the length of the unstretched spring

 a. Do not include the ends.

 Extension springs tend to stretch over time so you will need to 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.

The Dasma chart below will help you determine what rated weight to order. If your garage door weighs # 150 pounds then you would order a pair of 150 pound red coded springs.

Dasma Official Color Codes for Extension Springs:

#10 White       #20 Green    #30 Yellow    #40 Blue      #50 Red        #60 Brown

#70 Orange    #80 Gold      #90 Lt. Blue    #100 Tan      #110 White    #120 Green

#130 Yellow   #140 Blue    #150 Red        #160 Brown  #170 Orange  #180 Gold

#190 Lt. Blue  #200 Tan     #210 White     #220 Green   #230 Yellow   #240 Blue

#250 Red       #260 Brown #270 Orange   #280 Gold     #290 Lt. Blue   #300 Tan

Telephone support available 12 hours a day or call us and we will specialize your spring order and have them promptly available online.

Call toll free 1-866-427-7003 or email us.     

Do your research. There are many videos online.