Stationary Cone

A stationary cone is the non-winding end fitting of a torsion spring. It sits at the left end of the spring as you face the door from inside the garage. The cone bolts firmly to the center bearing plate and does not rotate. This fixed anchor is what lets the spring store energy. One end stays stationary while the winding cone at the other end is turned, building a sustained twist along the coil.

You can spot the stationary cone by the two bolts or lag screws that pin it to the bearing plate. It has no winding-bar holes. During normal operation, the spring's end coils are gripped by the set screws of each cone. The spring twists as the door moves, but the cone does not rotate.

Matched pairs and wind direction:

Torsion springs ship with both cones already pressed on. Springs come in right-hand wind (RHW) and left-hand wind (LHW) versions, so the cones are orientation-specific. A technician must match the wind direction to the door's existing system.

On a standard two-spring setup, for example, the right spring is right-hand wound and the left is left-hand wound. Both stationary cones face inward toward the center of the shaft. They clamp to each side of the center bearing plate. If a cone goes on the wrong end, the spring cannot be wound in the correct direction and the door will not lift.

The stationary cone rarely fails on its own. Worn or stripped set screws can let it slip on the shaft under load, causing sudden tension loss. Checking the set screws during spring replacement is standard practice.