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HDS-20 Right-Hand Heavy Duty Soft-Down Stay is designed for a top-opening flap door, so it supports doors that pivot upward rather than to the side. This right-hand configuration pairs with hinges to control the motion of the flap. The stay is used with piano, butt or concealed hinges, tying directly into common hinge choices on woodworking and cabinet jobs. HDS-20 is designed to hold the door in the fully opened position, so the flap remains up without additional support during access or work. This stay is classified as a heavy duty soft-down stay, aligning with applications that demand controlled movement for heavier doors. The black finish of the HDS-20HR/BLK part matches dark hardware layouts, keeping the stay in line with black hinge selections on the same flap door.
HDS-20 uses a torque calculation of Torque = Door Height x 1/2 x Door Weight, giving a direct formula to size the stay pair for the flap. Using this equation shows how door height and door weight work together to define required torque. K-Type stays cover 140 to 200 kgf.cm (121 to 173 lbs. inch) per pair, matching a defined torque band for lighter qualifying doors. M-Type stays cover 200 to 250 kgf.cm (173 to 216 lbs. inch) per pair, fitting doors that fall into a mid-range torque requirement. H-Type stays cover 250 to 300 kgf.cm (216 to 260 lbs. inch) per pair, aligning with heavier flap doors that require higher torque support.
The HDS-20 Right-Hand Heavy Duty Soft-Down Stay is specified for top-opening flap doors, so it fits lids or flaps that rotate upward around a lower hinge line. In this configuration the stay acts between the cabinet body and the flap, supporting the door as it swings upward. Because it is used with piano, butt or concealed hinges, it ties into both long continuous hinge runs and discrete hinge patterns on top-opening fronts. The design is suited to applications that benefit from a door held in the fully opened position, such as storage compartments or work surfaces accessed from above. Matching this right-hand stay with the door layout keeps motion controlled on the designated side of the opening.
The specified torque calculation, Torque = Door Height x 1/2 x Door Weight, sets a predictable method for aligning flap characteristics with the HDS-20 pair. This formula ties the stay selection directly to measurable door dimensions and mass, supporting repeatable planning across similar projects. The K-Type torque range of 140 to 200 kgf.cm (121 to 173 lbs. inch) per pair addresses doors that fall within this lighter torque band, so these doors operate within the intended soft-down capacity. The M-Type range of 200 to 250 kgf.cm (173 to 216 lbs. inch) per pair supports doors that demand a mid-level torque response, keeping motion behavior comparable from job to job within that band. The H-Type range of 250 to 300 kgf.cm (216 to 260 lbs. inch) per pair targets heavier doors, assigning them to a higher torque capacity that still follows the same calculation approach. These defined ranges let the HDS-20 system cover multiple flap weights while using a single torque equation for layout consistency.
HDS-20 Right-Hand Heavy Duty Soft-Down Stay is for a top-opening flap door, so it serves doors that pivot upward around a lower hinge edge in overhead or lid-style applications.
The HDS-20 stay is used with piano, butt or concealed hinges, aligning it with common hinge choices on flap doors that need both pivot support and controlled opening motion.
The HDS-20 torque calculation is Torque = Door Height x 1/2 x Door Weight, so door height and door weight set the torque requirement for selecting a matching stay type.
K-Type HDS-20 stays cover 140 to 200 kgf.cm (121 to 173 lbs. inch) per pair, fitting flap doors whose calculated torque falls within that lighter range.
M-Type HDS-20 stays cover 200 to 250 kgf.cm (173 to 216 lbs. inch) per pair, matching flap doors whose torque calculation places them in a mid-range load level.
H-Type HDS-20 stays cover 250 to 300 kgf.cm (216 to 260 lbs. inch) per pair, aligning with heavier top-opening flap doors that generate higher torque values.
HDS-20 Right-Hand Heavy Duty Soft-Down Stay, Black, serves top-opening flap doors that benefit from controlled upward motion and a fully opened holding position. Using the torque calculation and the K-Type, M-Type or H-Type ranges, flap doors can be matched to an HDS-20 pair that fits their calculated torque band. For projects using piano, butt or concealed hinges on upward-opening fronts, this Sugatsune America stay brings a defined torque method to top-opening flap layouts.