End Bearing Plate

An end bearing plate is a steel bracket fastened to the wall on each side of the garage door opening, mounted at the same height as the torsion spring assembly. Each plate contains a pressed-in ball bearing or nylon bearing that supports the torsion shaft at its ends, allowing the shaft—and the cable drums mounted on it—to rotate freely under spring load.

Together, the two end bearing plates and the center bearing plate form the three-point support system for the entire torsion assembly. The end plates carry most of the radial load from the spring tension, especially on single-spring systems where the spring is coiled between the center plate and one end plate.

End bearing plates are sized for the shaft diameter (typically 1 inch on residential doors). On heavier commercial doors, larger-diameter shafts and correspondingly larger plates are used. The plate's bolt pattern must match the structural framing above the door—typically a steel angle or wood header—so the plate cannot pull loose under the hundreds of pounds of spring tension it must resist.

Worn bearings in end bearing plates allow shaft wobble that causes the cable drums to shift laterally. This makes cables jump grooves or rub against the door sections. Bearing replacement is straightforward if the plates are accessible, but requires a full spring tension release first.