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Sugatsune lid supports in this HDS-20S/SR-WT version provide a self-opening stay for a top-opening flap door, so the door lifts itself past the free stop angle and moves quickly into a stable open position. This stay is part of the Lid Supports and Stays product class, giving installers a purpose-built component when a flap must open upward rather than swing sideways. The HDS-20S design is intended to hold the door in the fully opened position, so the flap remains up while the work area or cabinet interior is accessed. As an S-Type stay rated for 111 to 150 kgf.cm (96 to 130 lbs. inch) of torque per pair, it supports heavier top-opening doors within that range, which is important when sizing hardware to door weight and height. The right-hand configuration lets you match the hardware layout to the hinge and stay orientation on the job.
This Sugatsune self-opening stay is intended specifically for top-opening flap doors, so layout and drilling revolve around an upward-swinging panel rather than a side-hinged door. The specified pairing with piano, butt, or concealed hinges means the hinge axis defines the rotation while the stay carries the torque, so mounting positions must respect the chosen hinge style. The S-Type torque rating of 111 to 150 kgf.cm (96 to 130 lbs. inch) per pair ties performance directly to door height and weight, and the published formula, Torque = Door Height x 1/2 x Door Weight, defines how the flap load is evaluated. Using that relationship lets installers select door dimensions that stay within the working range of this HDS-20S pair. Because HDS-20S is designed to hold the door fully open, bracket locations are chosen so the final open angle aligns with the intended access and overhead clearance.
This Sugatsune America HDS-20S/SR-WT stay is defined as a self-opening stay for a top-opening flap door, so it fits applications where the panel must lift upward to expose a work surface, storage area, or cabinet interior. The product is categorized under Work Surface & Tables and Lift Systems, Lid Supports and Stays, which positions it for installations on lift-up lids in furniture, cabinets, or built-in workstations. Its right-hand configuration means it is intended for layouts where the geometry and hinge placement call for right-side mounting in coordination with the flap motion. Because the stay is designed for use in pairs, it suits wider or heavier lids that require balanced support at both sides, spreading the torque demand across two S-Type units within the 111 to 150 kgf.cm (96 to 130 lbs. inch) per pair specification. In practice, this supports flap doors whose calculated torque falls inside that band, aligning the stay choice with dimensioned design work.
The HDS-20S design is specified to hold the door in the fully opened position, so once the flap passes the free stop angle and the self-opening action completes, the lid remains up for uninterrupted access. That characteristic suits work surfaces or storage compartments that are opened repeatedly, since the user can operate the flap without needing a separate prop. The torque calculation formula, Torque = Door Height x 1/2 x Door Weight, translates physical door dimensions directly into a design value, which helps designers and installers coordinate panel height and material selection with the S-Type torque band. When that calculated torque falls between 111 and 150 kgf.cm (96 and 130 lbs. inch), the pair of stays is matched to the door load, which supports predictable opening behavior and hold-open performance in repeated use.
The S-Type torque range of 111 to 150 kgf.cm (96 to 130 lbs. inch) per pair defines how much opening assistance and hold-open capability the HDS-20S/SR-WT stay can provide, which is critical when planning lid size and material weight. Using the specified Torque = Door Height x 1/2 x Door Weight relationship ties the design directly to measurable cabinet dimensions, so flap geometry is chosen with a clear link to the stay's working envelope. Because the stay is used in pairs, installers can distribute the required torque across two support points, reducing stress on each mounting location and on the hinges that guide the motion. The self-opening feature that moves the door past the free stop angle means the user starts the motion and then the mechanism carries the panel into its open position, which can streamline operation on frequently accessed compartments. The HDS-20S design's focus on holding the door fully open helps maintain a consistent, repeatable open angle across cycles, supporting predictable clearance above work surfaces or inside storage zones. Its classification as a heavy duty plastic and steel right-hand stay, in a white finish, aligns the component with applications where both structural support and appearance around white casework or tables matter as part of the hardware selection.
The HDS-20S/SR-WT is specified for a top-opening flap door, so it is applied where the door opens upward rather than swinging sideways.
This stay is described for use with piano, butt, or concealed hinges, so those hinges provide the pivot while the stay controls lift and hold-open behavior.
As an S-Type, this stay pair is rated for 111 to 150 kgf.cm (96 to 130 lbs. inch) of torque, aligning it with heavier flap doors within that calculated range.
The specified relationship is Torque = Door Height x 1/2 x Door Weight, so measured height and weight of the flap determine the torque value for sizing to this pair.
This lid support moves the door past its free stop angle on its own, so once movement begins, the stay drives the flap toward its fully open position.
The HDS-20S version is defined to hold the door in the fully opened position, so the flap remains up while the interior or work surface is in use.
The Sugatsune America HDS-20S/SR-WT self-opening stay pairs a top-opening flap door design with a defined S-Type torque range of 111 to 150 kgf.cm (96 to 130 lbs. inch) per pair, giving clear parameters for door height and weight. Its ability to work with piano, butt, or concealed hinges lets you coordinate the stay with standard hinge hardware while maintaining upward-opening motion. With a right-hand layout, white finish, and a design that holds the door fully open, this heavy duty plastic and steel lid support aligns well with flap-based work surfaces and storage compartments. Selecting this model lets you match flap geometry and hinge style to a stay specifically described for top-opening self-opening applications.