Heavy-Duty Custom Duplex Spring Replacement for 24-Foot Commercial Doors

Not every spring job is the same. When you're dealing with a 24-foot commercial door, the standard hardware just won't cut it. The weight, the cycle count, the daily stress on those components - it all adds up fast. That's exactly why this job called for custom duplex springs built specifically for the load.

Duplex springs are two springs wound onto a single shaft. On a door this size, that setup is what gives you the right amount of torque to lift the door smoothly without putting unnecessary strain on the operator or the hardware. It's not the most common setup, but when the door demands it, it's the right call.

Getting the spring size wrong on a heavy commercial door isn't just an inconvenience - it's a safety issue. An undersized spring means the opener is working overtime, the door moves unevenly, and the whole system wears out faster. An oversized spring creates its own problems. Matching the spring to the exact door weight and height is what separates a proper repair from a temporary fix.

We spec these out carefully every time. The wire size, the inside diameter, the length, the wind direction - all of it factors into building a spring that will hold up under real commercial use. These aren't off-the-shelf parts. They're built for the job.

If your commercial door has been sluggish, noisy, or just feels like it's working harder than it used to, the springs are usually the first place to look. A door that size running on worn or mismatched springs is a problem waiting to get worse.