Garage Door Extension Spring Size Chart & Colors

extension spring size chart & color codes


Extension springs are responsible for operating your garage door. Working in tandem with your opener, the springs are the muscle behind the scenes. This post answers some common extension spring questions and provide a size chart.

Door WeightColorSpring Code
10 LBWhite25-42-10
20 LBGreen24-42-20
30 LBYellow25-42-30
40 LBBlue25-42-20
50 LBRed25-42-50
60 LBBrown25-42-60
70 LBOrange25-42-70
80 LBGold25-42-80
90 LBLight Blue25-42-90
100 LBTan25-42-100
110 LBWhite25-42-110
120 LBGreen25-42-120
130 LBYellow25-42-130
140 LBBlue25-42-140
150 LBRed25-42-150
160 LBBrown25-42-160
170 LBOrange25-42-170
180 LBGold25-42-180
190 LBLight Blue25-42-190
200 LBTan25-42-200
210 LBWhite25-42-210
220 LBGreen25-42-220
230 LBYellow25-42-230
240 LBBlue25-42-240
250 LBRed25-42-250
260 LBBrown25-42-260
270 LBOrange25-42-270
280 LBGold25-42-280
290 LBLight Blue25-42-290
300 LBTan25-42-300

It’s important to choose the right size and weight for your specific door. Extension spring sizes are based on inside diameter (ID), wire size, and length. The ID is the distance between the coils when the spring is at rest, while the wire size refers to the thickness of the wire used to create the spring. The length can vary depending on the application. Springs with a larger ID, thicker wire, or longer length can support more weight.

Your garage door height and weight determine what type of spring to use. A taller door must have stronger springs, while a wider one requires springs with a larger ID. And, of course, a heavier door will need springs to support more weight. To help you choose the right extension springs for your needs, we’ve created this helpful extension spring size weight chart. Find your door’s specs in the left column, then match them up with the correct spring size in the right column. With this guide, you can confidently choose the right springs for your sectional garage door.


What are extension springs, and how do they work?

Extension springs help to counterbalance the weight of your garage door. They sit above the horizontal tracks on either side of the door and stretch and contract as it moves. Over time, extension springs become worn or damaged, necessitating replacement or conversion to a torsion spring system. Most extension springs are rated for a life expectancy of 10,000 cycles, but they can break sooner depending on usage and weather. A broken extension spring requires a call to a local repair company.


Types of garage door springs

There are two main types of garage door springs – extension springs and torsion springs.

Extension springs used to be the most common type. They are attached to the door at either end, stretching as it opens and closes. Extension springs are also more susceptible to breakage and are more dangerous when they break. Because extension springs are hooked in, the released tension causes the spring to hit the surrounding area when it breaks. Snapped extension springs can break a windshield, dent your car, or gouge a nearby wall.

Torsion springs are wound around a metal shaft and twist as the door opens and closes. Torsion springs are our preferred spring method.


Extension spring ends

extension spring ends


Extension spring safety tips

Here are some tips for those with extension springs to keep you safe.

  • Follow the manufacturer’s instructions for installing, maintaining, and replacing your extension springs.
  • Do not remove any safety devices installed on your garage door or springs.
  • Do not attempt to repair or adjust your garage door or springs yourself. If you have any questions about their safety, please contact a professional garage door service company.
  • Keep children and pets away from your garage door and spring area when the door is open. There is a risk of serious injury if they come into contact with the door or spring while it is in motion.
  • Do not try to release the tension on a spring by removing coils. This can cause the spring to snap and cause serious injury. If you need to reduce the tension on a spring, contact a local garage door repair company.


Replacing garage door springs is not a DIY project, so if you need help, please call us at 817-500-5988 or contact us. Converting extension springs to a torsion spring setup costs between $650 – $1000, depending on the number and size of springs.

Doorvana Blog Garage Door Extension Spring Size Chart & Colors