Sugatsune America's concealed torque hinge HG-TUWA07 combines friction-based position holding with mounting on the back or inside of a lid or door. The hinge stays out of view from the exterior while controlling the movement of appropriately sized panels.
With 6.2 lb·in (7.1 kgf·cm) of torque per hinge, the HG-TUWA07 suits applications where compact hardware must resist unintended movement without a separate lid stay. Its 130° opening range accommodates access to equipment interiors while holding it in the desired position.
HG-TUWA07 Technical Specifications
- Torque per hinge: 6.2 lb·in (7.1 kgf·cm))
- Initial torque variation: -20% to +40%, per manufacturer literature
- Material: SUS304 stainless steel body and base with a 303 stainless steel shaft
- Finish: Barrel polished
- Unit weight: 88 g
- Maximum opening angle: 130°
- Mounting orientation: Horizontal or vertical
- Fastening: Four mounting holes; 5 mm or #10 self-tapping screws required
- Fasteners included: No
- Cycle Tested: 20,000 cycles
Not suitable for high-frequency use.
Recommended for indoor use only.
Engineering Considerations for Concealed Lid Hinges
When specifying a concealed lid hinge HG-TUWA07, evaluate the lid's mass, hinge-axis orientation, and distance between the axis and center of gravity. These factors determine the gravitational moment the hinge must resist at different angles.
The simplest way to check the torque your application generates is to take the door's weight, multiply it by the measured distance from the hinge to the panel's center of gravity, and divide by 2. Or;
1 /2 x (weight of the panel) x (measured distance of the panel from the hinge side).
NOTE: Adding a handle or the shape of the panel needs to be accounted for.
Horizontal and vertical mounting are supported. When installing two hinges, align their shafts to help prevent binding and uneven wear. Confirm clearance around adjacent panels, seals, and internal components throughout the 130° travel.
Use the product's dimensional drawings and Sugatsune's CAD file resources to validate the assembly before production.
Industrial Applications and Related Models
Potential uses include instrument enclosure lids, machinery covers, and equipment access panels that require aesthetically pleasing, concealed hardware. Final suitability depends on the panel geometry, mounting structure, and operating conditions.
For larger or heavier panels, check out the HG-TUWA15 concealed torque hinge, rated at 13.2 lb·in (15.3 kgf·cm). Explore additional torque hinge configurations or contact Sugatsune America for selection assistance.
Concealed Torque Hinge - HG-TUWA07 FAQs
What torque does the HG-TUWA07 provide?
The hinge is rated at 6.2 lb·in (7.1 kgf·cm) per piece. NOTE: Initial torque can vary -20% to +40%.
Can the concealed lid hinge HG-TUWA07 be used for upward-opening lids?
Yes. Horizontal installation is supported. Be sure to verify the amount of torque your application generates based on panel size and weight.
Does this concealed lid hinge require lubrication?
No, and Sugatsune instructs users not to lubricate the hinge.
