Open Sesame Garages · Oklahoma City
Do extension springs need safety cables?
Yes — every extension spring should have a safety cable threaded through the middle of it and anchored at both ends. Without one, a spring that breaks under tension can release across the garage. Torsion springs do not need containment cables because they stay on their shaft when they fail.
How to check yours in 30 seconds
- Stand inside the garage with the door closed and look at the horizontal tracks near the ceiling.
- If you see long, stretched springs running alongside the tracks, you have extension springs.
- Look for a thin steel cable running through the hollow center of each spring, anchored to the track hanger at one end and the spring bracket at the other.
- If a spring has no cable through it, it is unrestrained. That is the one to fix.
What to do if a safety cable is missing
Stop using the opener and avoid standing beside the tracks until it is corrected. A stretched extension spring under load is storing serious energy with nothing to contain it.
Adding containment cables is one of the cheapest safety improvements available on a garage door — far cheaper than replacing springs, and a fraction of a full conversion.
It is also a reasonable moment to ask whether converting to a torsion system makes sense, since a torsion setup has no exposed stretched springs at all. If the extension system is otherwise healthy, adding the cable is the honest answer and the conversion can wait.
Why torsion springs do not need them
A torsion spring is mounted on a steel shaft above the door and bolted to a center bracket. When it fails, it unwinds in place on that shaft — loudly, but contained.
An extension spring is under tension between two anchor points along the track. When it fails, both halves are free to move, which is exactly what the containment cable is there to prevent.
Related questions
How often do safety cables need replacing?
Inspect them annually along with the lift cables. Replace any cable showing fraying, kinks, or rust. They are inexpensive, and a corroded containment cable is not doing the job it is there to do.
Are safety cables required by code?
Containment cables on extension springs are standard practice and are called for by the industry safety standards manufacturers build to. Older doors installed before the practice was common are exactly the ones most likely to be missing them.
Need this fixed, not just explained?
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