Everything You Need to Know about Garage Door Extension Springs

28Garage door extension springs run along the door’s horizontal track and help to open and close your garage door as the springs stress and compress. Extension springs are manufactured specifically for the height of a garage door.

Understanding the Numbers

Let’s say you’re looking at a seven-foot extension spring 25 x 42. This extension spring is used on a seven-foot garage door. It has a 25-inch relaxed or compressed length and a 42-inch stretched length, which is how far the spring should be stretched when the garage door is closed.

As you might expect, longer springs tend to be used on taller garage doors. If you use an extension spring with a different first number, you need to adjust your cable length to achieve the necessary 10 percent of stretch when your door is open.

Don’t ever use a seven-foot extension spring for an eight-foot garage door. This forces the spring to stretch farther to allow the door to close, which creates extra tension, affects how the door is lifted and compromises the life of the spring.

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Extension Springs – Weight Capacity

Garage door extension springs are designed to lift a specific amount of weight. For example, a 100-pound extension spring is capable of lifting 100 pounds. However, the pulleys on the garage door reduce the amount of weight carried by the extension spring, so the extension spring really only has to lift half of its weight – in this case, 50 pounds.

This is why two 100-pound extension springs are needed to lift a 100-pound garage door. Also, be sure to replace both extension springs at the same time in order to maintain balance.

Garage Door Extension Spring Color Coding

Garage door extension springs are color-coded to help you identify what type of lifting power and extension spring your garage door requires. Those color codes are as follows:

  • Tan: 100 pounds
  • White: 110 pounds
  • Green: 120 pounds
  • Yellow: 130 pounds
  • Blue: 140 pounds
  • Red: 150 pounds
  • Brown: 160 pounds
  • Orange: 170 pounds
  • Gold: 180 pounds
  • Light Blue: 190 pounds

***This pattern is repeated in 100 pound increments for various sizes. For example 110, 210, 310 pounds, etc. will all be color-coded with white paint.

American-Made Quality

Extension SpringsMany imported garage door extension springs are made from low-grade steel, but we can assure you that all DIY Garage Door parts extension springs are American-made with high quality steel and come with a four-year warranty.

Watch our how-to videos to learn more about measuring and replacing your garage door extension springs, and call us at 1-866-813-7899 if you have any questions.