Our One-Way Concealed Torque Hinge HG-TQWA15-A

Sugatsune America’s one-way concealed torque hinge HG-TQWA15-A is designed for lids, doors, and panels that require controlled positioning, concealed installation, and a wide opening angle. With free-stop torque in the opening direction and a 130° opening angle, this hinge supports applications where the panel must remain stable during access, inspection, or use.

The one-way concealed torque hinge, HG-TQWA15-A, with a 130° wide opening, provides 13.2 lb·in (15.2 kgf-cm) of torque per piece and is made from 304 stainless steel. Its concealed design helps keep the exterior surface clean while still providing controlled motion inside the assembly. This makes it suitable for sheet-metal cabinetry, lockers, compact workstations, and industrial equipment panels.

The HG-TQWA15-A is the Type A model, meaning the torque/free-stop function is applied in the opening direction. For applications requiring torque in the closing direction, Sugatsune also offers the HG-TQWA15-B model. Selecting the correct type is important for ensuring that the hinge provides resistance in the intended direction of movement.

Concealed Design With Tested Durability

The one-way concealed torque hinge HG-TQWA15-A is built for applications where the hinge should be hidden from the exterior while still supporting controlled panel movement. 

Its concealed installation can benefit architectural projects where appearance matters, as well as equipment designs where exposed hardware could interfere with operation, cleaning, or adjacent components.

The HG-TQWA15-A has been tested to 20,000 open/close cycles, supporting consistent performance in repeated-use applications.

This combination of concealed mounting, 304 stainless steel construction, and controlled one-way torque supports applications where space efficiency, durability, and predictable motion are all important.

Type A vs. Type B: Directional Torque Selection

The HG-TQWA15 series is available in two directional torque types. Both versions share the same core construction and performance specifications, but they apply torque in different directions.

• HG-TQWA15-A, Type A: Torque/free-stop function in the opening direction
• HG-TQWA15-B, Type B: Torque/free-stop function in the closing direction

This distinction is important for top-opening lids, bottom-opening lids, side-opening panels, and equipment covers. The correct model should be selected based on the direction in which the panel needs to hold its position.

For example, the Type A one-way concealed torque hinge with a 130° wide opening, HG-TQWA15-A, may be appropriate for a top-opening lid that needs to stay open during access. The Type B model may be better suited for a bottom-opening panel where controlled resistance is needed in the opposite direction.

Application Fit: When to Specify HG-TQWA15-A

The one-way concealed torque hinge HG-TQWA15-A is suitable for applications requiring concealed hardware, wide-angle access, and stable positioning in the opening direction.

It can be used in both architectural and industrial settings where a standard hinge would not provide enough motion control.

Architectural and commercial applications may include:

• concealed access panels
• Specialty cabinetry and commercial millwork
• Lift-up panels in built-in Laboratory, healthcare, and institutional casework
• Display fixtures, service counters, and storage compartments
• Storage lockers

Industrial and equipment-focused applications may include:

• Medical or analytical equipment lids or access panels
• Automation equipment panels and machine enclosures
• Inspection panels and maintenance access doors
• Manufacturing equipment covers
• Electrical or control housings
• Custom equipment assemblies requiring concealed motion control

For architects and designers, the concealed format helps preserve a clean finished surface. For industrial engineers and equipment manufacturers, the one-way free-stop function helps hold a lid or panel open during service, inspection, or operation without relying on separate support hardware in many suitable applications.

FAQs

Can this torque hinge be used both horizontally and vertically?

Yes. The one-way concealed torque hinge, 130° wide opening, HG-TQWA15-A, can be installed in either vertical or horizontal orientation. The free-stop function is available in both orientations, but the final application should still be reviewed for panel weight, mounting direction, and required operating feel.

What does “free stop” mean for this torque hinge?

“Free stop” means the hinge can hold a lid, door, or panel at any position within its operating range. The HG-TQWA15-A provides a torque/free-stop function in the opening direction, allowing the panel to remain open at a selected angle without additional support hardware in many applications.

When should this hinge be used instead of a standard hinge?

A standard hinge allows a panel to swing, but it does not provide controlled positioning on its own. The one-way concealed torque hinge HG-TQWA15-A should be considered when the application needs concealed installation, a 130° opening angle, and free-stop motion in the opening direction. It is useful for lids, enclosures, access panels, and casework where the panel must stay open during use or service.

What is the difference between HG-TQWA15-A and HG-TQWA15-B?

The difference is in the torque direction. The HG-TQWA15-A is Type A and provides a torque/free-stop function in the opening direction. The HG-TQWA15-B is Type B and provides a torque/free-stop function in the closing direction. The correct model depends on the lid or panel orientation and the direction in which resistance is required.

What should be reviewed before specifying the HG-TQWA15-A?

Before specifying the HG-TQWA15-A, review the panel weight, panel size, mounting orientation, opening direction, desired hold position, hinge quantity, clearance requirements, and whether the application requires Type A or Type B torque. These details help determine whether the hinge will provide the correct motion control for the assembly.

Reach Out Today

If you have questions about the one-way concealed torque hinge HG-TQWA15-A or need support selecting a concealed torque hinge for architectural casework, commercial millwork, equipment panels, lids, or enclosures, contact Sugatsune America’s USA-based Inside Sales team. 

Their experts can help review torque direction, mounting orientation, panel details, and application requirements before you finalize your specification.