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Sugatsune concealed door straightener DSR423-2300-25 is a fully concealed passage door hardware component that is installed at the time of manufacturing to help protect doors from future warping. The 2300 mm length supports long doors, giving you a continuous straightening member across the door height where warp tends to show. This straightener is designed for doors from 78 to 95 inches long, so it targets common tall interior and passage door sizes used in many woodworking projects. The straightener is recessed mounted under laminate, keeping the hardware hidden while still applying corrective force within the door. That recessed installation preserves the visible face of the door, which matters when working with decorative laminates or finished faces. Models DSR213, DSR423 and DSR403 follow the same prevention concept, so this unit fits into a consistent door-straightening approach on the shop floor.
This door straightener is recessed mounted under laminate, so the routing work happens before face materials are applied, fitting naturally into a manufacturing sequence. The recessed mount keeps the hardware in the door core, letting the laminate run over it without interruption. An adjustment range of plus or minus 10 mm is built into the unit, so the door can be tuned after installation to compensate for movement within that range. That adjustment is made from the top of the door with an M4 Allen key, so access stays simple once the door is hung. Being able to adjust from the top helps when doors are already installed in frames, because the correction happens without disturbing the finished faces. The minimum door thickness of 12 mm, or 1/2 inch, defines which door constructions can accept this straightener without compromising the door core.
The DSR423-2300-25 straightener is described as passage door hardware, so it suits interior passage doors where warp control is important for fit and swing. Its 2300 mm length works well on tall doors in the 78 to 95 inch range, placing the straightener almost full height to counter twisting along the stile. Because it is recessed mounted under laminate, this straightener fits doors built with a laminate skin over a core, such as many commercial or architectural doors. Installing it at the time of manufacturing integrates the straightener into the door build, so the core, laminate, and straightener work together as a single assembly in service. Models DSR213, DSR423 and DSR403 share the same primary purpose of preventing warping, which helps standardize hardware choices across different door sizes within a project.
The fully concealed design of this Sugatsune concealed door straightener keeps all components hidden, so doors maintain a clean appearance while still gaining internal warp control. The plus or minus 10 mm adjustment capacity allows the installer or shop to dial in the door position within that range, which matters when doors show slight bow after climate changes. Accessing that adjustment from the top of the door with an M4 Allen key centralizes the adjustment point, simplifying alignment work during hanging or later service. The minimum door thickness of 12 mm, or 1/2 inch, defines a clear baseline for door construction so the straightener sits properly within the core without crowding the laminate layers. Optional mounting holes are provided for 4 M4 (U.S. #8) flathead countersunk wood screws, giving a defined mechanical fastening method that secures the straightener to the door structure during manufacturing.
The DSR423-2300-25 door straightener is designed for doors from 78 to 95 inches long, so it targets common tall interior and passage door builds.
The straightener is recessed mounted under laminate at the time of manufacturing, integrating it into the door core before the laminate skin is applied.
The DSR423-2300-25 offers plus or minus 10 mm adjustment, which is made from the top of the door using an M4 Allen key for straightforward tuning.
The straightener is specified for a minimum door thickness of 12 mm, or 1/2 inch, so doors must meet that thickness for proper integration.
The unit is classified as passage door hardware, so it is suited to interior passage doors where control of warping helps maintain smooth door operation.
The straightener offers optional mounting holes designed for 4 M4 (U.S. #8) flathead countersunk wood screws, providing a defined fastening approach.
The Sugatsune concealed door straightener DSR423-2300-25 combines a 2300 mm length, recessed under-laminate mounting, and plus or minus 10 mm top adjustment to address warp control on 78 to 95 inch passage doors. The minimum 12 mm, or 1/2 inch, door thickness requirement points it at common laminated-core constructions in woodworking and builders hardware projects. Optional mounting holes for 4 M4 (U.S. #8) flathead countersunk wood screws provide a clear fastening method into the door structure. For shops and installers aligning hardware choices across multiple doors, this straightener offers a defined Sugatsune America option within passage door hardware. Put this model into your door manufacturing workflow when you need concealed, adjustable internal straightening on tall laminate-faced doors.