Top Fixture

A top fixture is the hardware bracket at the upper-left and upper-right corners of the top section of a sectional garage door. Amarr defines it as "adjustable brackets, which usually carry track rollers, mounted on the top corners of the top section of the sectional door." Raynor calls it "a bracket for positioning the top guide roller on the top section of the door."

The top fixture holds the top roller. This roller rides in the vertical track when the door is closed and near the bottom of its travel. As the door opens, this roller is the first to reach the curved radius at the top of the vertical track. It enters the bend on every open cycle and exits it on every close cycle. Because it rounds the corner constantly, it takes more side force than any roller lower on the door.

The bracket is adjustable. It has slotted holes or a pivoting mount. The installer uses that adjustment to tilt the roller stem slightly inward or outward. The goal is smooth travel through the radius without the roller dragging against the track wall.

On most residential doors, the top fixture also anchors the lift cable. The cable runs up from the bottom bracket, along the door face, and connects to a slot on the top fixture. From there it feeds up and winds onto the cable drum. A cracked or bent top fixture is a two-part problem: it tilts the top roller out of alignment, and it may release the cable under load.

The flag bracket mounts to the wall just above the top fixture's path. It holds the corner where the vertical track meets the horizontal track.