How To Measure Garage Door Springs. Step 1 determine springs id (inside diameter) If you prefer a matching set, we can convert a mismatched set to a matching set.
Standard residential torsion springs are found on a shaft above the center of the garage door. When a garage door torsion spring breaks in half, both parts must be pulled together on a flat surface to get a proper measurement of the length. Use this method if the door worked correctly before the spring(s) broke and the garage door has not been tampered with.
For a single car door place a bath scale in the center of the opening, remove all spring tension from the door and lower the door onto the scale.
How to measure if the spring is broken. Spring length (how long each spring is) 4. This should be done from the inside. Measure the circumference of the cable drum, and measure the height of the garage door in inches.