HDS-20 right-hand light duty soft-down stay gives a controlled motion for a top-opening flap door, so the flap opens to its full position without slamming against the cabinet. This stay is for top-opening flap doors, so it supports upward-opening fronts where a smooth open position matters for access. The stay is designed for use with piano, butt or concealed hinges, so it works alongside common hinge choices used on flap doors in shops and built-ins. The hardware is used in pairs, so two stays share the load and balance the movement across the width of the door. HDS-20 is designed to hold the door in a fully opened position, so the flap stays up while work is done inside the cabinet or compartment. The black finish on this stay provides a dark, unobtrusive appearance that blends with darker casework or interior hardware layouts.
HDS-20KR/BLK uses a soft-down stay mechanism for top-opening flap doors, so mounting positions are planned to let the stay control the door through its opening arc. Torque calculation for this stay uses the formula: Torque = Door Height x 1/2 x Door Weight, so door dimensions and weight are factored when selecting between torque ranges. K-Type torque covers 140 to 200 kgf.cm (121 to 173 lbs. inch) per pair, so it fits lighter flap doors that fall within that moment range. M-Type torque covers 200 to 250 kgf.cm (173 to 216 lbs. inch) per pair, so it serves mid-range flap doors where more support is needed. H-Type torque covers 250 to 300 kgf.cm (216 to 260 lbs. inch) per pair, so heavier flap doors within that moment range can still achieve controlled soft-down performance.
The SAP description identifies this product as a top opening, light duty, right black stay, so it is oriented for right-hand use on lighter top-opening flap doors that suit this torque class. The stay is listed under lid supports and stays in the work surface and tables plus lift systems, lid supports and stays plus down stays category, so its role is to support and control flap or lid motion rather than act as a hinge. Web description notes use for top-opening flap door with piano, butt or concealed hinges, so installations can follow standard hinge layouts on overheads, counters, or shallow compartments. Using it in pairs gives one stay on each side of the flap, so the door loads and motion are shared left and right for more even action across the opening width.
Designation as HDS-20 right-hand light duty soft-down stay means the mechanism is tuned for lighter doors on the right side, so matching the stay to the door weight and side helps maintain the intended soft-down behavior over the full travel. The specified torque formula with door height times one-half times door weight directs attention to the door moment, so installers can align K-Type, M-Type, or H-Type selection to the actual torque demand of the flap. K-Type at 140 to 200 kgf.cm (121 to 173 lbs. inch) per pair serves doors at the lower end of the moment range, so the stay can control them without excessive resistance. M-Type at 200 to 250 kgf.cm (173 to 216 lbs. inch) per pair addresses mid-range door moments, so doors in that band benefit from added support while still opening fully. H-Type at 250 to 300 kgf.cm (216 to 260 lbs. inch) per pair supports heavier flap doors within that moment window, so these doors can open to the fully opened position and remain there as described. The black finish on HDS-20KR/BLK adds a visual fit option, so projects using darker interior hardware can maintain a consistent hardware appearance inside the cabinet or enclosure.
HDS-20KR/BLK is designed for a top-opening flap door, so it supports doors that lift upward and need controlled motion and a stable fully opened position.
The HDS-20 soft-down stay is used in pairs, so one unit is mounted on each side of the flap door to balance torque and motion during opening.
The HDS-20 flap door stay is used with piano, butt or concealed hinges, so it works alongside these hinge types named in the product description.
The HDS-20 is designed to hold the door in a fully opened position, so the flap stays open for access without needing to be held by hand.
Torque for the HDS-20 is calculated as Door Height x 1/2 x Door Weight, so door size and weight together determine the torque requirement.
The HDS-20 K-Type is 140-200 kgf.cm per pair, M-Type is 200-250 kgf.cm per pair, and H-Type is 250-300 kgf.cm per pair, matching increasing door moments.
HDS-20KR/BLK from Sugatsune America combines a right-hand light duty soft-down stay with defined torque ranges, so flap doors can be matched to K-Type, M-Type, or H-Type performance. Its use with piano, butt or concealed hinges and its design for top-opening flap doors give cabinet and fixture builds a specific solution for controlled opening and a stable fully opened position on lighter upward-opening fronts. For projects needing a black soft-down stay that supports these torque bands, this part number provides a clearly defined option.