Order by 24/7 by web, contact our sales reps or call by phone.
What you need, when you need it, all in one place.
Most orders ship same day.
Advice and support from knowledgeable professionals.
DSR403 concealed door straightener from Sugatsune America is a fully concealed, recess-mounted door straightener designed to protect doors from future warping. The straightener is installed at the time of manufacturing so the door core and skins stay aligned over time, supporting consistent operation. At 2300mm length, it runs a substantial portion of the door height, which distributes correction force along the stile rather than at a single point. The straightener is recess mounted under laminate, so it sits within the door thickness and keeps the visible faces clean for laminating or finishing. A cover cap in plain/nickel finish provides a neat termination at the adjustment area, which keeps the access point discreet while still serviceable. Sold in boxes of 25 pieces, this configuration suits production runs where the same warping control strategy is repeated across multiple doors.
The DSR403 concealed door straightener is recess mounted under laminate, so a channel is machined into the door to accept the profile and allow the laminate to run over it. Once the recess is prepared, the straightener is pressure-fit into place, which locks the body into the door without screw holes in the core. Adjustment can be made from the top of the door using an M4 Allen Key, allowing warp correction after hanging while the door remains in position. The plus or minus 10 mm adjustment range gives room to correct both concave and convex conditions within the door leaf. The unit can be cut from the bottom by up to 420 mm (16-9/16 inch), so the length can be tailored to door height while maintaining the top adjustment point.
This Sugatsune door straightener is used in passage door hardware applications where long-term flatness is important. It is installed at the time of manufacturing, so the straightener becomes part of the internal door structure rather than an add-on. The 2300mm length gives a long reinforcing spine that works well in tall doors, distributing correcting force along the stile. Because it recess mounts under laminate, it suits doors with laminated faces where the reinforcement must not telegraph through the surface. A minimum door thickness of 18 mm (11/16 inch) defines its typical use in standard interior or similar doors built to that thickness. The plain/nickel cover cap sits at the adjustment area, keeping the top-edge access point visually tidy while leaving the mechanism accessible.
The plus or minus 10 mm adjustment capability is central to how the DSR403 manages door warp over time. By allowing adjustment from the top with an M4 Allen Key, the system supports incremental corrections as the door reacts to site conditions, without disturbing finishes or edge details. Pressure-fit retention avoids drilling for screws in the core, which keeps the internal structure more uniform and can simplify machining patterns. The ability to cut up to 420 mm (16-9/16 inch) from the bottom lets fabricators size the straightener to various door heights while always keeping the adjustment point at the top. Being fully concealed and hidden, the straightener delivers structural correction without changing the visual design, which is important when hardware must support performance but remain invisible in the finished opening.
The DSR403 concealed door straightener is part of passage door hardware and is installed at the time of manufacturing, so it supports doors built with that hardware class in mind.
The DSR403 door straightener requires a minimum door thickness of 18 mm (11/16 inch), which guides door construction so the recess-mounted profile fits properly.
The DSR403 straightener is recess mounted under laminate and fully concealed, so it sits inside the door and stays hidden once laminates or skins are applied.
The DSR403 straightener offers plus or minus 10 mm adjustment from the top of the door using an M4 Allen Key, enabling on-door correction of warp.
The DSR403 door straightener can be cut from the bottom by up to 420 mm (16-9/16 inch), allowing the installed length to match specific door heights.
The DSR403 straightener is pressure-fit into its recess, so it is held in place without screws, which can streamline machining and installation steps.
The Sugatsune America DSR403-2300-25 concealed door straightener is built for doors where long-term flatness is important, using a recess-mounted profile under laminate to stay hidden. With plus or minus 10 mm top-edge adjustment via M4 Allen Key and pressure-fit installation, it supports efficient manufacturing and later fine tuning. The 2300mm length, ability to cut up to 420 mm from the bottom, and 18 mm minimum door thickness specification define a clear operating window for production runs. Sold in boxes of 25 pieces, this configuration aligns well with shops and manufacturers standardizing a proven warp-control solution across multiple doors.
Sold In: 1 Package
