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One-Way Torque Hinge Downward is a torque hinge from Sugatsune America that applies friction in only one direction, so you can design controlled motion while allowing free swing in the opposite direction. This model, HG-TQA90-B, provides free rotation when turned clockwise, which lets panels or lids move down or open smoothly in that direction without resistance. When turned counterclockwise, it applies constant torque, so the hinge resists motion in that direction and helps hold or slow the panel as it moves back. The hinge has 4 holes, giving defined mounting points that support secure installation on compatible surfaces. It has 2 knuckles, creating a compact hinge profile that suits concealed or recessed layouts where space is limited. The hinge is for indoor use only, aligning it with cabinets, fixtures, or equipment inside controlled environments.
This torque hinge is designed for indoor use only, so it fits cabinets, equipment enclosures, and interior fixtures where conditions stay within typical room environments. With 4 holes, the hinge offers a stable mounting pattern that supports firm attachment to doors, lids, or panels on both sides of the joint. The 2 knuckles give a short, neat hinge structure that suits recessed or semi-concealed mounting where visible hardware needs to stay minimal. The HG-TQA90-B model must not be lubricated, so its internal friction characteristics remain as designed, which supports consistent one-way torque behavior over time.
The HG-TQA90-B torque hinge provides friction in one direction only, so it fits projects where controlled motion is needed in just one travel direction, such as slowing or supporting a panel as it returns. Since it offers free rotation when turned clockwise and constant torque when turned counterclockwise, it can be oriented to match the desired downward or upward motion in your layout. Indoor use only makes it suitable for interior cabinetry, equipment covers, or interior architectural elements where environmental conditions stay moderate. The 4-hole layout supports secure mounting on both leaf sides, which helps keep alignment stable once the hinge is positioned on the panel and frame. With 2 knuckles, the hinge suits installations needing a compact joint that does not dominate the design, such as slim doors or low-profile panels.
The one-way friction design means torque is applied only when turned counterclockwise on the HG-TQA90-B, so movement in that direction is resisted while clockwise movement remains free, giving designers a clear way to control directional force. Initial torque may vary 20% plus or minus 40%, so the resistance you feel when moving the hinge can differ between individual units, which matters when matching multiple hinges in the same assembly. Torque will be affected by temperature, so motion can feel stiffer or lighter as indoor temperatures change, which influences how panels move at different times of year. The hinge is not suited to vibration environment, so it aligns with stable installations where strong vibration is not part of regular conditions. It is also not suitable for high frequency use, pointing it toward applications that operate on occasional or moderate cycles instead of continuous repetitive motion. The explicit note to not lubricate preserves the internal friction surfaces, which helps maintain the one-way torque effect during the service life of the hinge.
The HG-TQA90-B hinge has free rotation when turned clockwise and constant torque when turned counterclockwise, so one direction swings freely while the other direction is resisted.
The hinge suits indoor installations where a panel or lid needs controlled motion in one direction and free swing in the opposite direction, such as interior covers or cabinet-style elements.
The hinge torque will be affected by temperature, so motion resistance can feel higher or lower between warmer and cooler indoor conditions in normal building environments.
The HG-TQA90-B hinge is not suited to vibration environment, so it is intended for installations where strong or continuous vibration is not present during operation.
The hinge is not suitable for high frequency use, so it is aimed at applications with occasional or moderate movements rather than constant cycling.
The hinge has a do not lubricate note, because added lubricant can change the designed friction surfaces and alter the one-way torque performance.
The HG-TQA90-B One-Way Torque Hinge Downward from Sugatsune America combines free clockwise rotation with constant counterclockwise torque, supporting directional control for indoor panels and lids. Its 4-hole, 2-knuckle design suits compact, stable mounting in interior projects that rely on controlled one-way motion.