Gas Springs Guide 2026: Selecting the Right Strut for Your Application

Professional gas spring specification demands an understanding of mechanical force curves, mounting geometry, and environmental operating conditions. A correctly specified gas spring provides the precise assist required for safe operation, whereas an erroneous selection leads to premature seal failure or mechanical damage.

What Are the Key Technical Parameters of a Gas Spring?

Key parameters include extension force in Newtons, stroke length in millimetres, body length in millimetres, and end fitting geometry.

The selection of these parameters is critical to the overall performance and longevity of the gas spring. Incorrect specification can lead to reduced lifespan, increased maintenance costs, and decreased safety. It is essential to carefully consider each parameter and consult the manufacturer’s data sheet to ensure the correct selection.

In addition to the key technical parameters, it is also important to consider the environmental operating conditions, such as temperature, humidity, and vibration. These factors can significantly impact the performance and lifespan of the gas spring, and must be taken into account during the specification process.

How is Gas Spring Force Measured and Rated?

Force is typically measured at 5mm from the end of the stroke at a stable 20 degrees Celsius using a calibrated testing bench.

Many procurement managers mistakenly assume that a spring rated at 500N will provide a consistent 500N throughout its entire range of motion. In practice, the gas spring exhibits a force curve; the force is highest when compressed and decreases as the spring extends.

When selecting your component, you must consult the manufacturer’s data sheet for the force curve specific to the rod-to-cylinder ratio. Relying on nominal ratings alone often results in a lid that requires too much effort to close or, conversely, one that lacks the energy to remain fully open.

• Nominal Force (F1): Measured at 5mm from full extension.
• Spring Rate: The ratio of force increase from fully extended to fully compressed.
• Frictional Force: The internal resistance during movement, ideally kept below 10% of nominal force.
• Damping: Controlled by the oil orifice size, dictating extension speed.
• Thermal Expansion: The change in length of the gas spring due to temperature changes.

What is the Importance of Cylinder Material Selection?

The cylinder material selection plays a critical role in the overall performance and lifespan of the gas spring.

The most common materials used for gas spring cylinders are steel, aluminum, and stainless steel. Each material has its own unique characteristics, advantages, and disadvantages. Steel cylinders are the most common and offer a good balance between strength, durability, and cost. Aluminum cylinders are lightweight and corrosion-resistant, making them ideal for applications where weight is a concern. Stainless steel cylinders offer excellent corrosion resistance and are often used in harsh environments.

The selection of the cylinder material depends on the specific application and environmental operating conditions. It is essential to consult the manufacturer’s data sheet and consider factors such as temperature, humidity, and vibration when selecting the cylinder material.

How Does the Rod-to-Cylinder Ratio Affect Performance?

The rod-to-cylinder ratio plays a critical role in determining the force curve and overall performance of the gas spring.

The rod-to-cylinder ratio is the ratio of the diameter of the rod to the diameter of the cylinder. A higher ratio results in a higher force curve, while a lower ratio results in a lower force curve. The ideal ratio depends on the specific application and the required force curve. It is essential to consult the manufacturer’s data sheet and consider factors such as the required force, stroke length, and environmental operating conditions when selecting the rod-to-cylinder ratio.

The rod-to-cylinder ratio also affects the lifespan of the gas spring. A higher ratio can result in increased stress on the rod and cylinder, leading to reduced lifespan. A lower ratio can result in reduced force and increased stroke length, leading to increased wear and tear on the gas spring.

How Do You Select the Correct Mounting Geometry?

Select mounting positions using a geometric pivot analysis to ensure the strut provides the required leverage at the closed position.

The selection of the mounting geometry is critical to the overall performance and safety of the gas spring. Incorrect mounting geometry can result in reduced force, increased stress on the mounting points, and decreased safety. It is essential to carefully consider the mounting geometry and consult the manufacturer’s data sheet to ensure the correct selection.

In addition to the mounting geometry, it is also important to consider the end fittings and the pivot point. The end fittings must be compatible with the mounting points, and the pivot point must be carefully selected to ensure the required leverage and safety.

Mounting Geometry	Advantages	Disadvantages
Parallel Mounting	Easy to install, low stress on mounting points	Reduced force, increased stroke length
Perpendicular Mounting	Increased force, reduced stroke length	Higher stress on mounting points, more difficult to install
Angled Mounting	Optimal force and stroke length, reduced stress on mounting points	More difficult to install, requires careful calculation of pivot point

What is the Importance of Pivot Point Selection?

The pivot point selection plays a critical role in determining the required force and safety of the gas spring.

The pivot point is the point around which the gas spring rotates. The selection of the pivot point depends on the specific application and the required force curve. A careful calculation of the pivot point is essential to ensure the required force and safety.

The pivot point also affects the lifespan of the gas spring. A poorly selected pivot point can result in increased stress on the rod and cylinder, leading to reduced lifespan. A well-selected pivot point can result in reduced stress and increased lifespan.

What Are the Common Causes of Gas Spring Failure?

Seal failure due to improper orientation or rod corrosion are the most frequent causes of sudden force loss in industrial units.

Gas spring failure can be caused by a variety of factors, including improper orientation, rod corrosion, and excessive stress on the mounting points. It is essential to carefully consider these factors and take steps to prevent them, such as regular maintenance and inspection.

In addition to the common causes of gas spring failure, it is also important to consider the environmental operating conditions, such as temperature, humidity, and vibration. These factors can significantly impact the performance and lifespan of the gas spring, and must be taken into account during the specification process.

• Improper Orientation: Mounting the rod end upwards can result in reduced seal lifespan and increased corrosion.
• Rod Corrosion: Corrosion of the rod can result in reduced force and increased wear and tear on the gas spring.
• Excessive Stress: Excessive stress on the mounting points can result in reduced lifespan and increased risk of failure.
• Insufficient Maintenance: Failure to regularly inspect and maintain the gas spring can result in reduced lifespan and increased risk of failure.

How Can You Prevent Gas Spring Failure?

Regular maintenance, inspection, and proper specification can help prevent gas spring failure.

Regular maintenance and inspection are critical to preventing gas spring failure. This includes cleaning and inspecting the rod and cylinder, checking the mounting points, and ensuring proper orientation. It is also essential to properly specify the gas spring, taking into account factors such as force, stroke length, and environmental operating conditions.

In addition to regular maintenance and proper specification, it is also important to consider the use of protective coatings and lubricants to reduce corrosion and wear and tear on the gas spring. These coatings and lubricants can help extend the lifespan of the gas spring and reduce the risk of failure.

Frequently Asked Questions About Gas Springs

Can I re-gas or recharge a failed gas spring?

No, gas springs are factory-sealed units that cannot be recharged safely; they must be replaced if force is lost.

Gas springs are designed to be sealed units, and attempting to re-gas or recharge them can be dangerous and may result in injury or damage. If a gas spring fails, it is essential to replace it with a new one, rather than attempting to repair or re-gas it.

Are gas springs and dampers the same component?

Gas springs provide extension force, whereas dampers provide resistance to movement in one or both directions without pushing.

Gas springs and dampers are often confused with each other, but they serve different purposes. Gas springs are designed to provide extension force, while dampers are designed to provide resistance to movement. It is essential to understand the difference between these two components and select the correct one for your application.

What is the typical lifecycle of an industrial gas strut?

Standard industrial gas springs are designed for 50,000 cycles, while high-performance units can exceed 100,000 cycles under load.

The lifespan of a gas spring depends on a variety of factors, including the quality of the spring, the operating conditions, and the maintenance and inspection schedule. Regular maintenance and inspection can help extend the lifespan of the gas spring, while poor operating conditions and lack of maintenance can reduce it.

Conclusion

Specifying a gas spring is a balance of force requirements, physical space constraints, and environmental resistance. By following the geometric calculations outlined here and using the provided force calculator, you can eliminate the trial-and-error approach that plagues many mechanical design projects.

For custom industrial solutions or high-volume procurement, ensure your data sheet includes specific cycle life ratings and temperature tolerances. If you remain uncertain about your specific force requirements, our technical team is available to review your application specifications directly.

In conclusion, gas springs are complex components that require careful specification and consideration of a variety of factors. By understanding the key technical parameters, selecting the correct mounting geometry, and preventing gas spring failure, you can ensure the safe and reliable operation of your equipment.