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HDS-30 left-hand soft-down stay is a heavy-duty soft-down stay from Sugatsune America designed for upward-opening flap doors, giving flap fronts controlled movement in both the closed and fully opened positions. This left-hand unit works with piano, butt, or concealed hinges so the same stay can support different hinge layouts across a run of cabinets. The stay is designed for use in pairs, which spreads load between two units and supports heavier or wider flap doors. HDS-30 is designed to securely latch a flap closed, helping doors stay shut during regular use in workspaces. The same mechanism is also designed to hold the flap in the fully opened position, keeping the door stable while the interior is accessed. The black finish provides a dark, discreet look that fits projects where visible hardware is kept low-profile.
This Sugatsune heavy duty soft-down stay is part of the HDS-30 system, which uses a defined torque calculation to size stays to each flap door. The stated torque formula is: Torque = Door Height x 1/2 x Door Weight, so door height and weight both directly affect stay selection. HDS-30 torque ranges are specified by type: K-Type covers 140 to 200 kgf.cm (121 to 173 lbs. inch) per pair, M-Type covers 200 to 250 kgf.cm (173 to 216 lbs. inch) per pair, and H-Type covers 250 to 300 kgf.cm (216 to 260 lbs. inch) per pair. Using pairs within these torque bands aligns each flap with the stay capacity, supporting correct function for soft-down control, closing latching, and open-position holding.
This HDS-30HL/BLK left-hand heavy-duty soft-down stay is classified under lid supports and stays, aligning it with work surface and table projects that use upward-opening flap doors. The design focus on upward-opening flap doors suits cabinets where doors lift to clear work areas or equipment, such as overhead storage or workstation fronts. Compatibility with piano hinges means it can support long lids or panels that need continuous hinge support. The ability to work with butt hinges lets it fit more traditional cabinet door builds, keeping hinge selection consistent with existing shop standards. Compatibility with concealed hinges supports modern frameless or face-frame cabinets where visible hardware is minimized. The black finish aligns with dark cabinet interiors or exteriors where a black stay visually blends into the structure.
The clearly defined torque calculation, using door height times one-half times door weight, gives a direct method to match door characteristics to the HDS-30 torque bands. K-Type coverage from 140 to 200 kgf.cm (121 to 173 lbs. inch) per pair targets lighter or smaller doors within that torque window, aligning stay capacity to modest loads. M-Type coverage from 200 to 250 kgf.cm (173 to 216 lbs. inch) per pair suits medium-duty doors, where flap size or construction moves above the lighter range. H-Type coverage from 250 to 300 kgf.cm (216 to 260 lbs. inch) per pair fits heavier or larger flap doors, aligning high torque needs with the strongest configuration. Because the stay is designed for use in pairs, each torque band is defined on a per-pair basis, supporting consistent planning across left and right stays on the same door. The design that latches the flap closed and holds it fully open works in tandem with the torque matching so the door remains stable in both operating positions.
The HDS-30 left-hand heavy-duty soft-down stay is designed for upward-opening flap doors, so it supports fronts that lift up in work surface, table, or overhead cabinet applications.
The HDS-30 torque calculation uses the formula Torque = Door Height x 1/2 x Door Weight, giving a direct way to relate door dimensions and weight to stay selection.
The HDS-30 K-Type range is 140 to 200 kgf.cm (121 to 173 lbs. inch) per pair, fitting lighter doors whose calculated torque falls within that window.
The HDS-30 M-Type torque range of 200 to 250 kgf.cm (173 to 216 lbs. inch) per pair matches medium-duty flap doors that generate torque in that band.
The HDS-30 H-Type torque range of 250 to 300 kgf.cm (216 to 260 lbs. inch) per pair is suited to heavier or larger flap doors with higher calculated torque.
The HDS-30 soft-down stay is designed for use in pairs so torque and load are shared between two units, supporting heavier or wider doors within the specified ranges.
The HDS-30 left-hand heavy-duty soft-down stay in black from Sugatsune America is tailored to upward-opening flap doors that need controlled movement and defined torque planning. With compatibility across piano, butt, and concealed hinges, it adapts to different cabinet constructions while staying within the same HDS system. Using the specified torque formula and the K-Type, M-Type, or H-Type ranges, this stay pairs door dimensions and weight with appropriate support levels. For work surface, table, or overhead flap projects that match these parameters, this left-hand soft-down stay provides a focused option for managing flap door movement.