48 inch flat rail for rolling barn doors defines this Quiet Glide component as the horizontal track that carries the barn door hangers along the opening. The 48 inch length establishes the usable travel span for a single rolling barn door or part of a multi-rail run, which guides layout on the wall. The rail is part of the rolling barn door hardware class, so it works as the main structural guide that keeps the door running in a straight line. The rail height of 2 inches creates a compact vertical profile over the opening, which helps when positioning it above trim or casings. The aluminum construction keeps the rail weight light compared with many steel tracks, which can simplify handling during layout and fastening. The black finish provides a dark, uniform appearance along the run, which helps it blend visually with many common black barn door hangers.
This 48 inch flat rail is designed so that holes are drilled through the rail in order to fasten it to mounting brackets, which lets the installer place brackets where structure is available rather than at fixed factory locations. The 5/16 inch rail thickness defines how deep the drilled hole passes through the aluminum, which guides drill bit selection and drilling pressure. With a rail height of 2 inches, there is a clear band of material to position those through-holes while keeping adequate edge distance. The maximum 250 lb door weight rating ties the installed rail and brackets to doors within that load, which matters when choosing bracket counts and spacing for support.
This Quiet Glide flat rail belongs to the rolling barn door hardware category, so it is intended as the primary track component above an opening where a barn door will slide. The 48 inch length works as a short run for narrower openings or as a segment in longer multi-door designs, which helps when planning layouts that must match specific wall dimensions. With a rail height of 2 inches, the track occupies a defined strip of space over the header line, which is useful around existing trim or ceiling conditions. The aluminum rail body ties weight to strength in a lighter section, which can be useful on wall conditions where handling heavy track during installation is difficult. The black finish allows the rail to visually coordinate with black rolling barn door hardware in the same system, which keeps the installed track and hangers consistent in appearance.
The rail supports a maximum weight of 250 lb, which defines the upper limit for the door panel and hardware that will roll on this track in service. That rating helps match solid wood or composite doors to a rail that is rated for the load. The 5/16 inch thickness provides a known material section for drilling through-holes, which influences the choice of drill bit and how tightly mounting fasteners clamp the rail to brackets. Because the rail must be drilled through to fasten to mounting brackets, bracket positions can be laid out to align with framing members or structural backing. The 48 inch overall length also lets installers calculate hanger spacing and door travel limits relative to the rail ends. The black finish on the aluminum rail provides a dark surface along the door path, which can hide minor handling marks better than bare metal during normal installation.
The 48 inch flat rail for rolling barn doors has a 48 inch overall length, which sets the available sliding travel and helps determine door width and overlap around the opening.
This rail has a maximum weight rating of 250 lb, which means doors and related hardware are selected so their combined load remains at or below that value.
The flat rail height is 2 inches and thickness is 5/16 inch, which defines the material band available for drilling and the overall profile above the door opening.
The rail requires holes drilled through the aluminum so it can be fastened to mounting brackets, which allows bracket locations to follow structural conditions.
The component is an aluminum flat rail with a black finish, which combines lighter rail weight with a dark, uniform appearance along the mounted track.
The manufacturer part number is QG.FR4004.08, which identifies this specific 48 inch aluminum flat rail in the Quiet Glide rolling barn door hardware line.
This 48 inch Quiet Glide aluminum flat rail with black finish gives a defined 2 inch high, 5/16 inch thick track section rated for 250 lb doors, so it can be matched to barn door openings that fit within that travel length and load range. The need to drill through the rail for mounting bracket fastening provides layout flexibility along the wall. Using the QG.FR4004.08 part number from Wurth Baer Supply ties reorders or additional rails directly to the same rail profile for consistent results on multi-door projects.