How to Measure Garage Door Torsion Springs
Torsion springs come in a variety of wire gauges, lengths, and inner diameters, and each is designed to carry a certain weight. When replacing your garage door's torsion springs, it is important that you use springs with the same specifications as the previous ones. Installing springs that are the wrong size could be dangerous for you and your property.
You can easily measure your old torsion springs to determine which replacements to buy. All you need is one of your old springs and a tape measure.
You will need:
- Tape measure
- Existing torsion spring
Step 1: Measure out 20 coils on the spring
Count out 20 coils on your torsion spring and measure them with your tape measure. This measurement determines the wire gauge, which corresponds to the color painted on the spring. Refer to the table below to determine your wire gauge based on the spring color and/or 20 coil measurement.
Step 2: Measure the overall spring length
Measure your spring from wire to wire. Do not include the winding or stationary cones in this measurement. When looking for a replacement, you can safely increase or decrease the length by one inch if necessary.
Step 3: Measure the inner diameter of the spring
Use your tape measure to find the diameter. This can be measured on a broken spring. The diameter is usually 1-3/4" or 2" for residential doors and larger for commercial doors.
Step 4: Determine what spring wind you need
Torsion springs come in right wind and left wind. When looking at your garage door, left wound springs are installed on the right and coiled counterclockwise and right wound springs are installed on the left and coiled clockwise. If your door has two torsion springs, replace both springs at the same time to maintain an even tension on your garage door.
Need to install your new torsion springs? View our tutorial to learn how to get the job done. We recommend hiring a professional to install your springs if you have any doubts, but if you feel comfortable doing it yourself, be sure to follow all of the steps carefully and review our torsion spring safety guide.