Garage Door Extension Springs
Garage door extension springs are made specifically for a door height. For example, extension springs for 7' high garage doors generally cannot be used with 8' doors. When you use an extension spring with a taller door, the spring will have to stretch farther to allow the door to close. This affects the lift of the springs as well as how long the spring will last.
Because of the pulley system, the extension spring's stretch is 1/2 of the door height. A common stretch for an 8' high door is 27X48. The 48 indicates that the difference between the spring length when the door is open and when it is closed is 48 inches. Two times 48 inches is 96 inches, which is 8 feet (the door height).
The other number indicated by the stretch of an extension spring is the spring length. In the example above, the 27 refers to a spring length of 27 inches when the spring is compressed. Though there are often multiple spring lengths for a given door height, longer springs tend to be used on taller garage doors.
Extension springs are also designed to lift a certain amount of weight. An 80-pound extension spring, for example, will lift 80 pounds. Because of the pulley system, however, it only lifts 40 pounds of door weight. The extension spring on the other side of the door will lift another 40 pounds. Therefore, two 80-pound extension springs are used on a garage door that weighs 80 pounds.
Garage door extension springs are also color-coded. The color for each spring can be found by viewing the detail when you click the part number or description. The lifts for extension springs follow these colors: Tan-100# - White-110# - Green-120# - Yellow-130# - Blue-140# - Red-150# - Brown-160# - Orange-170# - Gold-180# - Light Blue-190#. This pattern is repeated through all the lift categories. For example, a 90#, a 290#, a 390# and a 490# will all be painted light blue on one end.
For extension spring cables, safety cables, pulleys, and other hardware for your extension spring door, see our Garage Door Extension Spring Hardware page.
Select your extension spring's length from the list below for your door height. You may also need to select the type of ends - open loop, closed loop, or clipped, as pictured above.
6' High
6'-6" High
7'-6" High
10' High
11' High
12' High
13' High
14' High
UN: Units by which each part is sold
Price: Cost per unit (for smaller quantities)
Qty | Price: When purchasing at least the quantity in the left column, the unit price is specied in the Price column to the right
