Our Lift-Assist Torque Hinge HG-TLAJ25

Sugatsune America’s lift-assist torque hinge HG-TLAJ25 is engineered for lids, covers, and equipment enclosures that require controlled movement, assisted opening force, and stable positioning within a 0° to 100° operating range. With adjustable retaining torque from 0 to 31 lbs·in and a lift-assist force range of 19.5 to 25.6 lbs·in, the HG-TLAJ25 is designed for compact to moderately sized panels (typically sheet metal) where user operation, panel control, and access clearance are all important.

Unlike a conventional one-way torque hinge, the bi-directional torque hinge HG-TLAJ25 is designed to shift the direction of force beyond 90°. This allows the mounted lid or panel to maintain controlled positioning up to 100° without relying on a separate lid stopper or secondary support hardware in many applications. For engineers, this can simplify assemblies in which a panel needs to open smoothly, remain stable, and require minimal user effort during operation.

The lift-assist torque hinge HG-TLAJ25 is built for technical applications such as medical equipment, analytical instruments, factory automation systems, inspection panels, and precision enclosures.

Adjustable Retaining Torque With Lift-Assist Support

The lift-assist torque hinge HG-TLAJ25 provides two important functions in one hinge: adjustable retaining torque and lift-assist support. The retaining torque can be adjusted from 0 to 31 lbs·in using a standard 3/8" or 10 mm hex key, allowing engineers to fine-tune the resistance based on panel weight, hinge position, and desired operating feel.

The hinge also provides 19.5-25.6 lb ·in of lift-assist force. This assists the opening motion of a lid, cover, or panel, reducing the effort required of the user while maintaining controlled movement within the hinge’s operating range.

This combination is especially useful in applications where a panel must be opened frequently, held at a serviceable angle, and closed with predictable resistance. For medical, laboratory, and factory automation equipment, controlled panel movement can improve service access, reduce hardware complexity, and support a cleaner end-user experience.

Bi-Directional Function Through a 100° Operating Range

Conventional one-way torque hinges may provide holding force in one direction but lose control as a lid or panel moves beyond certain angles. The friction-control design of the HG-TLAJ25 helps address this issue by changing the force direction beyond 90°, allowing the hinge to support free-stop positioning up to 100°.

This makes the spring-assist torque hinge HG-TLAJ25 useful for equipment covers and access panels that must stay open while an operator performs inspection, loading, adjustment, maintenance, or cleaning. In many applications, this can reduce the need for separate lid stays, stoppers, or hold-open devices.

Designed for Technical Equipment and Precision Assemblies

The lift-assist torque hinge HG-TLAJ25 is especially well suited for equipment and enclosures where compact motion-control hardware must support repeatable operation. Sugatsune’s HG-TLAJ series has passed 50,000 open/close cycles, supporting use in applications where lids or panels are operated regularly.

Common use cases may include:

• Medical equipment covers
• Analytical instrument panels
• Factory automation equipment
• Precision machinery access panels
• Control enclosures
• Inspection covers
• Laboratory equipment
• Commercial service access panels
• Technical furniture

An optional hinge cover is available for applications where the installed hardware should have a more finished appearance. This can be useful in commercial, laboratory, medical, or user-facing equipment designs where hardware performance and visual integration both matter.

Compare the HG-TLAJ Series

Sugatsune America offers two models in the HG-TLAJ series. Both provide the same adjustable retaining torque range of 0 to 31 lbs·in, but they differ in lift-assist force. This allows engineers to select the correct model based on the lid or panel's size, weight, and balance.

The HG-TLAJ25 is the lower lift-assist option in the series, making it appropriate for more compact, lighter applications that do not require the higher lift-assist force of the HG-TLAJ40. For larger or heavier lids, the HG-TLAJ40 may be more suitable.

Specifying the HG-TLAJ25 for Your Application

Because the HG-TLAJ25 combines adjustable retaining torque with lift-assist force, application review is important before specification. Engineers and designers should evaluate:

• Lid or panel weight
• Panel dimensions
• Center of gravity
• Hinge mounting location
• Number of hinges required
• Required opening angle
• Desired operating force
• Whether the panel must hold its position up to 100°
• Whether a separate stopper or support device is needed
• Frequency of operation
• Exposure to cleaning processes, moisture, or demanding environments
• Max Torque of the panel or lid to determine whether the HG-TLAJ25 or HG-TLAJ40 provides the appropriate lift-assist force

Make sure to select the appropriate torque hinge for the lid or panel's size and weight to ensure proper function, durability, and safety. For additional background on torque hinge function and selection, read Sugatsune’s guide to the ABCs of torque hinges. For assistance reviewing an application, contact Sugatsune America’s Inside Sales team to consult with a hardware expert.

FAQs

Does the HG-TLAJ25 have an adjustable retaining torque rating?

Yes. The lift-assist torque hinge HG-TLAJ25 has an adjustable retaining torque range of 0 to 31 lb ·in. The retaining torque can be adjusted using a standard 3/8" or 10 mm hex key. The hinge arrives from the factory at 0 lbs·in and can be adjusted based on the application’s panel weight, mounting orientation, and desired resistance.

Does the HG-TLAJ25 require a lid stopper?

In many applications, no. The spring-assist torque hinge HG-TLAJ25 is designed to reverse force direction beyond 90°, allowing free-stop positioning up to 100°. This can reduce the need for a separate lid stopper or secondary support hardware. However, if your lid needs to remain closed, you might consider a latch to counter the spring-back, a phenomenon that occurs with most torque hinges. Having some kind of stop would also prevent over-rotation. The full assembly should still be evaluated based on panel weight, mounting position, operating angle, and use conditions.

When should the lift-assist torque hinge HG-TLAJ25 be used?

The lift-assist torque hinge HG-TLAJ25 should be considered when a lid, cover, or panel needs controlled opening, assisted lift force, and stable positioning within a 0° to 100° operating range. It is commonly suited for medical equipment, analytical instruments, factory automation systems, inspection panels, and compact enclosures.

What is the difference between the HG-TLAJ25 and HG-TLAJ40?

Both models provide adjustable retaining torque from 0 to 31 lbs·in, but they differ in lift-assist force. The HG-TLAJ25 provides 19.5 to 25.6 lbs·in of lift-assist force, while the HG-TLAJ40 provides 31 to 38.9 lbs·in. The HG-TLAJ25 is generally better suited for applications with smaller, lighter lids or panel

Can the HG-TLAJ25 be used in architectural applications?

Yes, but the HG-TLAJ25 was designed primarily for industrial applications, using lighter, thinner materials such as sheet metal or aluminum, which are commonly used on machinery and other industrial equipment. It may be used in select architectural or commercial applications, but we strongly recommend contacting our technical experts at (8900) 562-5267 to discuss project specifics.