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DSR403 concealed door straightener is a fully concealed, hidden straightener designed to protect doors from future warping. This Sugatsune America unit is installed at the time of manufacturing so the door core is stabilized before it reaches service, helping maintain a consistent plane for cleaner reveals. The 2700mm length gives coverage along a substantial portion of the door height, helping the installer counteract stresses within the slab. It is part of Sugatsune's DSR403 series of door straighteners, which are used in passage door hardware applications where a flush appearance is important. The straightener works as an internal tension member that can be adjusted as needed, so fabricators can correct developing bow without altering the visible door faces.
This DSR403 straightener is recess mounted under laminate, so the carpentry work centers on routing a precise channel inside the door. The design is intended for a minimum door thickness of 18 mm, which defines the door types and constructions where it can be used. Installers gain a concealed straightening system that sits within the door, leaving clearance for surrounding jamb and hardware. Because the unit is fully concealed, layout focuses on internal routing dimensions, then inserting the straightener so it pressure-fits into position. Once the door is hung, adjustment from the top of the door with an M4 Allen key provides access without disturbing the laminate or face veneers.
This 2700mm DSR403 concealed door straightener is used in builders hardware and passage door hardware applications where warping control is needed inside the door leaf. It is installed at the time of manufacturing, so it becomes part of the door structure rather than a surface add-on. The straightener sits recess mounted under laminate, which suits doors built with laminate skins over a core that can be routed for the channel. Because the unit is fully concealed and hidden, it supports designs that call for clean, uninterrupted door faces in commercial or residential settings, while still giving the fabricator an internal method to resist bowing forces over the door height.
The DSR403 straightener provides plus or minus 10 mm of adjustment, which allows the installer or fabricator to dial in tension against a warped or bowing door leaf. This adjustment is made from the top of the door using an M4 Allen key, so the door can remain in its opening while it is being fine-tuned. The 2700mm bar can be cut from the bottom up to 420 mm, which lets the shop tailor the straightener length to the specific door height while keeping the adjustment access at the top edge. Pressure-fit installation, with no screws needed, concentrates the work on accurate recess sizing so the bar seats firmly along its length. Together, these details help reduce later rework because any developing warp can be corrected within the straightener's travel range instead of altering frames or hinges.
The DSR403 concealed door straightener is intended for doors with a minimum thickness of 18 mm, so it fits within the core while leaving material around the recess.
The DSR403 door straightener is recess mounted under laminate and held by a pressure-fit in the routed channel, so it sits fully within the door thickness.
The DSR403 door straightener offers plus or minus 10 mm of adjustment, operated from the top of the door using an M4 Allen key for convenient tuning.
The DSR403 straightener can be cut from the bottom by up to 420 mm, allowing the fabricator to match the bar length to the actual door height.
The DSR403 concealed door straightener is installed at the time of manufacturing, so it becomes part of the internal door structure before laminates are finished.
The Sugatsune DSR403 concealed door straightener is designed to protect doors from future warping by giving an internal, adjustable method to counter bow.
The 2700mm DSR403 concealed door straightener from Sugatsune America gives fabricators a built-in method to protect doors from future warping. Its recess mounted, fully hidden design keeps the focus on clean door faces while the internal bar manages bow. With plus or minus 10 mm top-side adjustment using an M4 Allen key and the ability to cut up to 420 mm from the bottom, it adapts to various door heights within its design limits. For projects calling for passage door hardware that maintains straight, consistent door leaves, this straightener offers an internal control point at the manufacturing stage.
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