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Schwinn 6K399 C-channel inner corner is a black plastic corner piece for aluminum C-channels that joins two channel lengths at an inside corner, so a straight channel run can turn a corner cleanly without exposed edges. The 7/8 in (22 mm) width matches the Schwinn 6K399 aluminum C-channel profile, so the transition through the corner keeps the handle line visually consistent along doors or panels. The black finish matches black C-channels, so the corner blends into the pull channel instead of drawing attention at the joint. The plastic construction forms a defined inner junction between two channels, which helps maintain the handle grip shape around the corner. The part is identified as Schwinn Hardware manufacturer part number 59283, so it can be specified or reordered accurately for projects using the same C-channel system.
The web description states that these plastic corner pieces allow you to make a straight cut to the channel, so installers can cut Schwinn 6K399 aluminum C-channels square instead of setting up angle cuts at inside corners. The same description explains that two straight channel lengths fit into the corner piece, so each leg of the handle channel slides into the connector and forms the inner corner. Because no miter cut to the channel is required, layout around inside cabinet or furniture corners stays simpler, with fewer precision cuts to set up in the shop. The ability to form a finished inner corner from straight cuts also helps keep channel joints more repeatable across multiple similar units.
The SAP description identifies this part as an inner corner for alu C-channels in black, so it is used at interior right-angle turns in runs of aluminum C-channel pulls or trim. The 7/8 in (22 mm) wide Schwinn 6K399 series reference connects this corner to channels of the same width, so it supports handle channels designed around that 22 mm profile. Because the plastic corner receives two straight channel lengths, it suits layouts where a continuous pull channel needs to wrap an inside cabinet corner or furniture carcass corner without a break in the grip zone. The color options mentioned in the web description, including black, align this corner with matching finish schemes, so the inner turn maintains a consistent visual line with adjacent aluminum C-channel sections.
The web description also notes availability of plastic corner pieces for straight-cut channel work, which positions this part within the Schwinn hardware C-channel handle and pull system. In that context, the inner corner becomes part of a modular set of components that shape how the pull channel navigates cabinet geometry. The clear identification as Schwinn Hardware, within the decorative hardware and moldings handles and pulls category, further situates this inner corner in handle channel applications on doors, drawers, or panels that use the 6K399 aluminum C-channel profile as a continuous pull.
The statement that the corner pieces allow you to fit two lengths into the corner piece for a finished inner or outer corner explains why they support repeatable fabrication: each channel leg is processed with the same straight cut, so shop work benefits from a single, consistent cutting setup. The fact that no miter cut to the channel is required means installers avoid compound measuring and fine trimming at 45-degree angles, which reduces opportunities for visible gaps or misaligned edges at the inside corner. Using the defined plastic corner element to form the junction helps keep the handle channel profile continuous around the turn, so hands experience a more uniform grip where cabinet runs change direction.
The 7/8 in (22 mm) width match to the Schwinn 6K399 channel ensures that when the channel legs enter the inner corner, the visible edges of the aluminum profile align with the molded plastic geometry, which supports a consistent reveal along the length of the handle channel. The manufacturer part number 59283 gives designers and builders a precise identifier to specify the same corner component across drawings, purchase lists, and reorders, which helps maintain consistent hardware selection across multiple projects or phases using this C-channel system.
The Schwinn 6K399 C-channel inner corner joins two aluminum C-channel lengths at an inside corner, creating a finished turn so the handle channel can continue around a corner.
The plastic corner piece allows each aluminum C-channel to be cut straight, so installers form inner or outer corners without miter cutting the metal channel.
The inner corner is described as 7/8 in (22 mm) wide in the Schwinn 6K399 series, so it matches aluminum C-channels built around that 22 mm profile.
The web description identifies this part as a plastic corner piece, so the channel junction is formed by molded plastic rather than metal.
The SAP description states INNER CORNER FOR ALU C-CHANNELS,BLACK, so this version is a black corner piece for matching black channel runs.
The web description directs installers to download installation drawings at http://us.schwinn-group.com/fileadmin/user_upload/PDF/CS3_Install_Drawings___Templates.pdf.
This black Schwinn Hardware inner corner for alu C-channels, manufacturer part number 59283, ties directly to the 7/8 in (22 mm) wide 6K399 aluminum C-channel system, so it supports handle channel runs that must wrap an inside corner cleanly using straight-cut channel legs. Using this plastic corner piece where a 22 mm Schwinn C-channel turns an interior corner keeps the pull profile and color consistent through the transition.