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Sugatsune door straightener DSR213-2330-25 is a recessed door straightener designed for passage doors, so it supports long doors that need help resisting future warping. Sugatsune America specifies this model as a door straightener for use at the time of manufacturing, which means it becomes part of the door structure instead of a later add-on. The door straightener is available for recessed and concealed installation, so it can sit out of sight while it works to control door flatness. This model is identified as a partially recessed door straightener with cover caps, so it fits into a machined channel yet still lets the installer finish the visible edge cleanly. By controlling the straightness of the door early, the hardware helps the finished passage door operate more predictably over its service life.
The partially recessed door straightener layout means the installer routes or saws a defined channel into the door, so the bar sits securely and transfers correction forces into the door core. The minimum door thickness of 16 mm (5/8") tells you exactly which door builds this straightener suits, so it aligns well with many lightweight passage doors and narrow interior doors. The requirement for 8 M4 (U.S. #8) flathead countersunk wood screws establishes how the unit fastens into the door, so the heads sit flush in the countersinks and do not catch on the routed surface. Flathead countersunk mounting also helps pull the straightener tightly into its recess, so contact remains solid along the length for more consistent straightening action.
This adjustable door straightener is listed in the builders hardware and passage door hardware categories, so it is positioned for standard passage door manufacturing rather than heavy commercial framing. The minimum door thickness of 16 mm (5/8") means it serves thin to medium interior doors, so it works well where lighter cores still require control over bowing. Sugatsune America notes that models DSR213, DSR423 and DSR403 are installed at the time of manufacturing to prevent warping, so this DSR213-2330-25 version fits directly into new door builds rather than retrofit door repair projects. The recessed and concealed installation options let the straightener live within the door body, so the assembled door can be trimmed, edge-banded or finished using standard shop routines without extra surface hardware getting in the way.
The door straightener provides plus or minus 10 mm adjustment, so the installer can move the bar enough to counter typical door bow over time and fine-tune straightness after the door is hung. Adjustment from the top of the door with an M4 Allen Key gives direct access along the edge, so fine corrections can be made even when side clearances are tight. Adjustment from the back of the door with an M8 slot wrench gives an alternate approach, so the door shop can choose whichever access side fits its build sequence or jig layout. Having two adjustment access points helps keep the straightener serviceable once the door is in place, so small seasonal or humidity-driven changes in door shape can be corrected without major disassembly. Because the unit is partially recessed with cover caps, these adjustments tie into a stable, fixed bar position, so each turn of the tool produces predictable movement instead of flexing loose hardware.
The DSR213-2330-25 door straightener is classified as passage door hardware, so it is intended for passage doors where long door leaves benefit from added straightness control.
The partially recessed door straightener is installed into a routed section of the door and secured with 8 M4 (U.S. #8) flathead countersunk wood screws, so it sits flush and engages the door core.
The door straightener suits doors with a minimum thickness of 16 mm (5/8"), so it matches many interior passage door constructions that use thin to medium-thickness cores.
The recessed door straightener offers plus or minus 10 mm adjustment using either an M4 Allen Key from the top of the door or an M8 slot wrench from the back of the door.
The plus or minus 10 mm adjustment range lets the installer counter typical door bow in either direction, so the straightener can correct both inward and outward warping over the life of the door.
Cover caps finish the partially recessed area of the straightener, so the door edge presents a neater line while still allowing the internal hardware to stabilize door straightness.
The DSR213-2330-25 recessed door straightener from Sugatsune America pairs passage door hardware classification with a 78-95'L format, so it suits longer interior doors built around a 16 mm minimum thickness. Its partially recessed body, cover caps, and flathead countersunk screw mounting integrate into the door structure, so the bar works with the core rather than hanging off the surface. The plus or minus 10 mm adjustment operated by M4 Allen Key or M8 slot wrench lets installers dial in flatness from either the top or back of the door, so the finished leaf can be tuned to match frame conditions and reduce warping-related call-backs.