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HDS-20S/SR-BL self-opening stay is a Sugatsune America lid support designed for top-opening flap doors, so it handles lift-up applications where a door needs controlled support. This right-hand, S-Type stay works with piano, butt, or concealed hinges, which lets you match it with common hinge choices on work surfaces or cabinets. The stay is part of Sugatsune's lid supports and down stays product class, so it is built for flap motion control rather than simple hinges. Black heavy duty plastic and steel construction gives a robust body with a dark finish, which suits projects where hardware should present a black appearance while handling load. Because the HDS-20S stay holds the door in the fully opened position, it keeps the flap secure once raised, which matters when the opening position needs to stay stable during use.
This Sugatsune HDS-20S/SR-BL stay is used in pairs on a top-opening flap door, so planning assumes two stays share the door load. The manufacturer defines torque calculation as Torque = Door Height x 1/2 x Door Weight, which gives a clear way to relate flap dimensions and mass to the stay's operating range. The S-Type version is rated for 111-150 kgf.cm (96-130 lbs. inch) per pair, so doors falling within that torque window align with the designed performance band. Because it is a right-hand stay, layout must account for right-side placement relative to the hinge line. Working with piano, butt, or concealed hinges, the stay coordinates with the hinge pivot to provide lift support and stable open positioning.
This Sugatsune lid support is specified for a top-opening flap door used with piano, butt, or concealed hinges, so it suits lift-up fronts on cabinets, benches, or work tables where an upward swing is required. Being part of a work surface and tables category with lift systems, lid supports, and stays positions it squarely in applications where horizontal or near-horizontal surfaces hinge open. Using the stay in pairs on the flap spreads the torque demand across both units, which is important when selecting hardware for heavier doors within the S-Type torque band. Because the stay design lets the lid self open past the free stop angle, the motion carries the flap into a more open position, which helps move the door quickly into its working range once it passes the balance point. The ability to hold the door in the fully opened position means the flap remains up without additional support, which supports tasks that need a clear opening for access.
The HDS-20S designation combined with the S-Type torque rating of 111-150 kgf.cm (96-130 lbs. inch) per pair identifies this stay as the higher-torque option in the family, which matters when flap doors impose greater closing forces. The specified torque calculation, Torque = Door Height x 1/2 x Door Weight, directly connects the door geometry to the stay's capability, which helps match a given flap to the appropriate S-Type range for operation. Because the lid will self open past the free stop angle, the mechanism uses that torque window to continue opening motion once the flap is moving, which reduces the manual effort once the door is set in motion. The fact that HDS-20S is designed to hold the door in the fully opened position means the torque band is tuned for a stable final angle, which is important where users work under or in front of the open flap. As a right-hand, heavy duty plastic and steel unit, it provides a defined side placement and robust body for repeatable support across many open-close cycles.
The HDS-20S/SR-BL stay is designed for a top-opening flap door, so it supports upward-swinging fronts on cabinets, work surfaces, or lids that need controlled opening and holding.
The HDS-20S/SR-BL stay uses the formula Torque = Door Height x 1/2 x Door Weight, which links flap dimensions and mass directly to the torque range used for selection.
The HDS-20S S-Type stay is rated at 111-150 kgf.cm, or 96-130 lbs. inch per pair, which targets heavier top-opening flap doors within that torque window.
The Sugatsune HDS-20S/SR-BL stay is specified for use with piano, butt, or concealed hinges, allowing it to coordinate with several hinge types on flap installations.
On the HDS-20S/SR-BL stay, self opening past the free stop angle means the lid continues opening beyond an initial angle, helping it travel into a more open working position.
The HDS-20S stay is designed to hold the door in the fully opened position, which keeps the flap stable at its final angle for access or work under the opening.
The HDS-20S/SR-BL self-opening stay from Sugatsune America combines S-Type torque capacity with a right-hand layout, which suits heavier top-opening flap doors needing repeatable support. When a project uses piano, butt, or concealed hinges on an upward-swinging front, this stay provides both self opening past the free stop angle and holding at the fully opened position, so the flap moves into and remains at a stable working angle. For work surfaces, tables, or cabinet lids where controlled motion and a black heavy duty plastic and steel body fit the design, this lid support offers a clearly defined torque range and installation role ready to be applied on the next top-opening build.