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

Sugatsune America’s one-way concealed torque hinge HG-TQWA15-B is designed for lids, doors, and panels that require concealed installation, controlled positioning, and a 130° wide opening angle. This hinge provides a torque/free-stop function in the closing direction, making it suitable for applications where a panel must be controlled as it closes or lowers.

The one-way concealed torque hinge, HG-TQWA15-B, with a 130° wide opening, provides 13.2 lb·in (15.3 kgf-cm) of torque per piece and is made primarily from 304 stainless steel. Its concealed design helps maintain a clean exterior surface while providing controlled motion inside the assembly. This makes it useful for sheet metal and specialty cabinetry, industrial equipment, industrial workstations, equipment enclosures, storage lockers, and access panels.

The HG-TQWA15-B is the Type B model in the HG-TQWA15 series. Type B applies a torque/free-stop function in the closing direction. If the application requires torque in the opening direction, Sugatsune also offers the HG-TQWA15-A Type A model. Selecting the correct type is important to ensure the hinge provides resistance in the intended direction of movement.

Concealed Design With Verified Durability

The one-way concealed torque hinge HG-TQWA15-B is designed for applications where hardware must remain hidden from view while still supporting controlled panel movement.

This concealed format is useful for architectural projects where surface appearance matters and for industrial equipment where exposed hardware could interfere with adjacent parts, cleaning, or user interaction.

The HG-TQWA15-B has passed 20,000 open/close cycle testing, supporting consistent torque performance over repeated use.

This combination of concealed mounting, stainless steel construction, wide-angle access, and one-way torque is well-suited to applications where controlled motion, space efficiency, and durability 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 material, torque rating, opening angle, and general construction, but they apply the torque/free-stop function 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 difference matters for top-opening lids, bottom-opening lids, side-opening doors, and equipment panels. The correct model should be selected based on the direction in which the panel needs resistance and position-holding support.

For example, the Type B one-way concealed torque hinge with a 130° wide opening, HG-TQWA15-B, may be appropriate for a bottom-opening lid or downward-moving panel that requires controlled closing resistance. The Type A model may be more appropriate for a top-opening lid that needs to hold open during access.

Application Fit: When to Specify HG-TQWA15-B

The one-way concealed torque hinge HG-TQWA15-B is suitable for applications requiring concealed hardware, wide-angle access, and controlled motion in the closing direction. 

It can be specified for architectural, commercial, and industrial assemblies where a standard hinge would not provide enough motion control on its own.

Architectural and commercial applications may include:

• Architectural casework with concealed access panels
• Specialty cabinetry and commercial millwork
• Lift-up panels in built-in Laboratory, healthcare, and institutional casework furniture or compact workstations
• Laboratory, healthcare, and institutional casework
• Display fixtures, service counters, and storage compartments
• Storage lockers
• Interior applications where exposed hinge hardware is not preferred

Industrial and equipment-focused applications may include:

• Medical or analytical equipment lids or access  panels
• Automation equipment covers 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 installation can help preserve a clean finished surface. 

For industrial engineers and equipment manufacturers, the one-way free-stop function helps control the movement of a lid or panel in the closing direction, reducing the need for separate support hardware in many suitable applications.

FAQs

Can this one-way concealed torque hinge be installed both vertically and horizontally?

Yes. The one-way concealed torque hinge, 130° wide opening, HG-TQWA15-B, 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, hinge quantity, 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 different positions within its operating range. The HG-TQWA15-B provides a torque/free-stop function in the closing direction, allowing the panel to remain controlled as it moves through the closing side of its range.

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-B should be considered when the application needs concealed installation, a 130° opening angle, and free-stop motion in the closing direction. It is useful for lids, enclosures, access panels, and casework where controlled closing movement is required.

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 needed.

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

Before specifying the HG-TQWA15-B, review the panel weight, panel size, mounting orientation, opening direction, 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-B 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.