Rolling Door Parts

Rolling hangar doors carry their weight at ground level, which puts the wear on wheels, casters, and bearings rather than on cable and drums. We stock wheel axle assemblies, solid wheels, casters in a range of diameters and rail sizes, snap-action limit switches, control pendants, sprockets, bearings, and EPDM weather seal for rolling doors.

Wheels, casters, and axle assemblies

The wheel axle assembly is what the operator drives to move the door, and it is the component that takes the most abuse on a rolling door. Casters carry the rest of the panel weight along the track. Sizing matters here: casters vary by diameter, by rail size, and by tread width, and all three have to match your existing track. Measure the wheel or send us a photo before ordering.

Track debris is the usual culprit

Because rolling doors run at ground level, the track collects whatever is on the ground: grit, gravel, water, and in agricultural or coastal buildings, a good deal worse. That debris packs into the track and grinds at the wheels and bearings every cycle. A door that has started to drag or track unevenly usually needs the track cleared before it needs new hardware.

Controls and limit switches

Snap-action limit switches trip at a fixed point and are the common choice on rolling doors, where the travel stops are consistent. The switch shuts the motor off automatically and prevents it from driving the door past its stop. Control pendants give you up, down, and emergency stop from a single handheld station, typically wired to the motorized operator.

Rolling hangar door parts: common questions