Gas Traction Springs
Traction gas springs generate a controlled pulling force rather than a pushing force, keeping the piston rod retracted inside the cylinder until the application draws it outward.
Unlike conventional compression gas springs, which generate a pushing force, traction gas springs are specifically designed to create a controlled pulling force. Depending on the industry or region, they are also commonly referred to as tension gas springs, traction gas struts, pull type gas springs or tension gas struts. Although the terminology varies, they all describe the same type of gas spring that works in tension rather than compression.
At Newtone Gas Springs, we design and manufacture traction gas springs for OEM manufacturers, industrial equipment builders and specialised engineering applications where controlled pulling movement is required. These products are commonly used when a component must be pulled into position rather than pushed open, making them suitable for applications that cannot be solved using conventional gas springs.
Every traction gas spring is engineered according to the operating requirements of the application. Factors such as pulling force, stroke, extended length, compressed length, mounting geometry, operating environment and expected service life all influence the final product specification.
What Is a Traction Gas Spring?
A traction gas spring is a nitrogen-filled mechanical component that generates force in the opposite direction to a conventional compression gas spring. Instead of pushing the piston rod outward, the internal gas pressure keeps the piston rod retracted inside the cylinder, producing a controlled pulling force during operation.
Because they operate in tension, traction gas springs are often selected for applications where components must be held closed, pulled into position or supported while moving in the opposite direction to a traditional gas spring. Their compact design, predictable force characteristics and long service life make them an effective solution for a wide range of industrial and OEM applications.
How Does a Traction Gas Spring Work?
Although the internal construction of a traction gas spring is similar to that of a conventional gas spring, the operating principle is fundamentally different. A standard compression gas spring uses compressed nitrogen to push the piston rod outward, whereas a traction gas spring is engineered so that the internal gas pressure keeps the piston rod retracted inside the cylinder. As a result, the gas spring generates a controlled pulling force rather than a pushing force.
During operation, the piston rod is pulled outward by the movement of the application. As the rod extends, the internal pressure continues to generate a controlled tensile force, helping guide the movement smoothly while reducing the manual effort required. Once the external load is released, the gas spring returns to its original position in a controlled and predictable manner.
Like all Newtone gas springs, every traction gas spring is designed according to the actual operating conditions of the application. Pulling force, stroke, overall dimensions, mounting geometry, operating temperature and expected service life are all evaluated before production to ensure reliable long-term performance.
Traction Gas Springs vs. Compression Gas Springs
Although both products belong to the same gas spring family, they are designed to solve different engineering challenges. Choosing between a compression gas spring and a traction gas spring depends entirely on the direction of the required force and the behaviour of the moving component.
| Compression Gas Springs | Traction Gas Springs |
|---|---|
| Generate a controlled pushing force. | Generate a controlled pulling force. |
| The piston rod naturally extends from the cylinder. | The piston rod is naturally retained inside the cylinder. |
| Typically assist opening lids, covers and access panels. | Typically assist closing, retracting or pulling moving components. |
| Commonly used in thousands of industrial applications. | Selected for specialist applications requiring controlled tensile movement. |
| Often referred to as gas springs, gas struts or lift supports. | Also known as tension gas springs, traction gas struts or pull type gas springs. |
Neither solution is better than the other; they simply perform different functions. While compression gas springs are designed to support lifting movements, traction gas springs are specifically engineered for applications where controlled pulling force provides the most effective and reliable motion control.
Applications of Traction Gas Springs
Although traction gas springs are less common than conventional compression gas springs, they play a vital role in many specialised engineering applications. Whenever a mechanism requires a controlled pulling force rather than a pushing force, traction gas springs provide a compact, reliable and maintenance-friendly solution.
Industrial Machinery
Mechanisms that must remain securely closed during operation benefit from controlled tension while reducing stress on hinges and locking systems.
Machine Guards and Safety Covers
A traction gas spring assists the movement while minimising sudden or uncontrolled motion, contributing to safer maintenance procedures.
Railway and Transportation Equipment
Service panels, equipment compartments and inspection covers benefit from controlled pulling force under demanding service conditions.
Medical and Laboratory Equipment
Compact installation space combined with controlled movement supports mechanisms where components must be pulled into position.
Heavy Equipment and Special Machinery
Construction and mining machinery access panels and service mechanisms benefit from reduced manual force during maintenance.
Special OEM Projects
Custom traction gas springs are frequently specified for products requiring controlled tensile movement beyond standard capabilities.
Why Engineers Choose Traction Gas Springs
In many engineering projects, the challenge is not lifting a component but controlling how it is pulled into position. A traction gas spring provides a controlled tensile force that can improve movement, reduce mechanical stress and simplify operation without increasing the complexity of the mechanism.
| Advantages of Traction Gas Springs | Benefit |
|---|---|
| Controlled pulling force | Supports smooth and predictable tensile movement. |
| Compact design | Suitable for applications where installation space is limited. |
| Reduced manual effort | Makes equipment easier and safer to operate. |
| Reliable motion control | Helps reduce sudden movement and mechanical shock. |
| Custom engineering options | Available in various force ratings, stroke lengths and mounting configurations. |
| Suitable for OEM production | Can be designed specifically for the geometry and operating requirements of each application. |
How to Select the Right Traction Gas Spring
Choosing the correct traction gas spring involves more than selecting a pulling force. The overall performance of the mechanism depends on how the gas spring interacts with the moving component throughout the complete operating cycle.
| Selection Factor | Engineering Consideration |
|---|---|
| Pulling Force | The traction force should match the operating requirements of the application while ensuring smooth movement throughout the complete operating cycle. |
| Stroke Length | The required travel distance determines the stroke of the traction gas spring and influences the available movement of the mechanism. |
| Extended and Compressed Length | Overall dimensions must fit the available installation space without restricting movement. |
| Mounting Geometry | Bracket positions and mounting angles influence leverage, operating force and overall system behaviour. |
| Operating Environment | Temperature, humidity, dust and other environmental factors should be considered when selecting materials and sealing systems. |
| Operating Frequency | Applications operating continuously require different engineering considerations compared with equipment used only occasionally. |
Product Variants
Newtone’s traction gas springs are available in three configurations, allowing the movement characteristics to be matched to the exact requirements of the mechanism.
With Damping
Hydraulic damping for smooth retraction and soft-close motion.
- Integrated hydraulic damping for smooth retraction and soft-close motion
- Adjustable damping levels to match system dynamics
Without Damping
Direct gas-driven return with fast responsiveness.
- Direct gas-driven return with fast responsiveness
Lockable Traction Springs
Manual or automatic locking for secure positioning.
- Manual or automatic locking for secure positioning
- Ideal for hatches, heavy lids or adjustable equipment
Standard Product Range and Technical Specifications
The tables below summarise Newtone’s standard traction gas spring range, covering rod diameters from 6mm to 14mm and tube diameters from 18mm to 40mm, together with the available damping, locking, valve and material options for each size.
Types
| Rod (mm) | Tube (mm) | Max. Force (N) | Without Damping | With Damping | Locking |
|---|---|---|---|---|---|
| 6 | 18 | 400 | ✓ | ✓ | |
| 8 | 22 | 750 | ✓ | ✓ | |
| 8 | 28 | 600 | ✓ | ||
| 10 | 28 | 1500 | ✓ | ✓ | ✓ |
| 14 | 40 | 2500 | ✓ | ✓ | ✓ |
Options
| Rod (mm) | Tube (mm) | Max. Force | Side Valve | Top Valve | Stainless Steel |
|---|---|---|---|---|---|
| 6 | 18 | N | ✓ | ||
| 8 | 22 | N | ✓ | ✓ | ✓ |
| 8 | 28 | N | ✓ | ||
| 10 | 28 | N | ✓ | ✓ | ✓ |
| 14 | 40 | N | ✓ | ✓ |
Traction Gas Spring Specifications
| Rod / Tube | Stroke [mm] | Std. L.ext [mm] | Special Seal Pack | Side Relieve | Fill Valve | Threaded Ends (M × b) | F1 [N] [min–max] |
|---|---|---|---|---|---|---|---|
| 6 / 18 | 10–200 | stroke + 64 | +25 | +20 | – | M6×1.0×7 | 50–200 |
| 8 / 22 | 10–300 | stroke + 85 | +25 | +20 | – | M8×1.25×9 | 50–400 |
| 8 / 28 | 10–300 | stroke + 82 | +25 | +20 | – | M8×1.25×9 | 50–500 |
| 10 / 28 | 10–600 | stroke + 97 | +25 | +20 | – | M10×1.5×9 | 150–1500 |
| 14 / 40 | 10–1000 | stroke + 116 | standard | standard | – | M14 | 300–4000 |
Application Information That Helps Us Recommend the Right Solution
Every traction gas spring application is unique. Even mechanisms that appear similar may require different force characteristics because of changes in geometry, mounting position or operating conditions. Customers do not always need to provide detailed engineering documentation — photographs, sketches or basic dimensional information often provide enough data to begin assessing the project.
| Information | Why It Is Helpful |
|---|---|
| Weight of the moving component | Helps determine the required pulling force. |
| Required movement | Determines the appropriate stroke length. |
| Opening or closing geometry | Allows evaluation of the required mounting arrangement. |
| Installation space | Determines suitable extended and compressed lengths. |
| Operating environment | Supports material and sealing system selection. |
| Existing gas spring or part number | Can simplify replacement or redesign projects. |
Common Specification Mistakes
Many performance issues are caused by selecting a traction gas spring based only on the required force. While force is important, installation geometry, mounting positions and stroke length have an equally significant influence on how the mechanism behaves in real operating conditions.
Selecting an incorrect stroke, unsuitable mounting points or inappropriate overall dimensions may lead to excessive operating effort, limited movement or unnecessary stress on hinges and mechanical components.
Installation Guidelines and Service Life
Correct installation is essential for achieving the expected performance from a traction gas spring. Unlike conventional compression gas springs, traction gas springs operate by generating a controlled pulling force. As a result, mounting geometry, bracket alignment and operating angles have a significant influence on both the movement of the mechanism and the overall service life of the product.
When properly installed, a traction gas spring provides smooth, predictable movement while reducing unnecessary loads on hinges, pivots and surrounding mechanical components. Poor alignment or incorrect bracket positioning may introduce side loading, increase friction and reduce the operating life of both the gas spring and the equipment itself.
Selecting Suitable End Fittings and Mounting Hardware
The performance of a traction gas spring depends not only on the gas spring itself but also on the components used to connect it to the application. Newtone offers a wide range of mounting options, including ball sockets, eyelets, clevis fittings and customised connection solutions for OEM projects.
| Mounting Component | Purpose |
|---|---|
| Ball Socket End Fittings | Allow controlled angular movement while accommodating minor alignment changes during operation. |
| Eyelet End Fittings | Provide a simple and durable mounting solution for industrial applications. |
| Clevis End Fittings | Suitable where a secure pivot connection is required. |
| Custom Mounting Solutions | Available for specialised OEM applications requiring unique installation geometries. |
Factors That Influence Service Life
The durability of a traction gas spring depends on much more than its internal construction. Operating conditions, installation quality and application design all contribute to long-term performance.
| Factor | Effect on Performance |
|---|---|
| Correct Mounting Geometry | Helps minimise side loading and ensures smooth movement throughout the operating cycle. |
| Suitable End Fittings | Reduce unnecessary stress on both the gas spring and the surrounding mechanism. |
| Operating Temperature | Temperature changes influence internal gas pressure and therefore the pulling force. |
| Environmental Conditions | Dust, humidity, chemicals and corrosive environments should be considered when selecting materials and sealing systems. |
| Operating Frequency | Applications performing frequent operating cycles require appropriate engineering consideration during product selection. |
| Mechanical Alignment | Proper alignment reduces wear and contributes to consistent long-term performance. |
Maintenance Recommendations
Traction gas springs are sealed mechanical components that normally require very little routine maintenance. However, periodic inspection of mounting brackets, end fittings and moving components is recommended to ensure reliable operation throughout the product’s service life.
The piston rod should always remain clean and free from scratches, corrosion or mechanical damage. Any contamination on the rod surface may affect sealing performance and reduce operating life. Traction gas springs should never be disassembled, heated or modified, as they contain high-pressure nitrogen gas.
Custom Traction Gas Springs for OEM Manufacturers
Unlike standard compression gas springs, traction gas springs are often developed for specialised engineering applications where conventional products cannot provide the required movement. Because every mechanism behaves differently, OEM manufacturers frequently require custom-designed traction gas springs that match the geometry, operating conditions and force requirements of the equipment.
At Newtone Gas Springs, we work closely with equipment manufacturers to develop traction gas springs tailored to each project. Rather than adapting the application to fit a standard product, we engineer the gas spring around the actual operating conditions, helping achieve smoother movement, improved reliability and consistent long-term performance.
Engineering Support from Concept to Production
Every engineering project begins with understanding how the mechanism operates. Our engineers review the movement of the application, the direction of the required pulling force, available installation space, stroke requirements and mounting geometry before recommending an appropriate solution.
Customers may provide engineering drawings, CAD models, photographs, existing samples or even basic dimensional sketches. In many cases, this information is sufficient for our engineering team to begin developing a suitable traction gas spring for prototype evaluation.
Available Customisation Options
Traction gas springs can be customised in numerous ways to meet the specific requirements of each application. Depending on the project, virtually every key operating parameter can be adapted to optimise performance.
| Customisation Option | Description |
|---|---|
| Pulling Force | Engineered according to the mechanical requirements of the application. |
| Stroke Length | Designed to provide the required movement while maintaining smooth operation. |
| Extended and Compressed Length | Adapted to suit the available installation space. |
| End Fittings | Available with a wide variety of standard or custom connection options. |
| Tube and Rod Dimensions | Selected according to force requirements and installation constraints. |
| Surface Finish and Materials | Material options are available for demanding industrial or corrosive environments. |
| Customer Identification | Special markings, labels and customer-specific part numbers can be supplied where required. |
Prototype Development and Replacement Projects
Many traction gas spring projects begin with prototype quantities before progressing to serial production. Prototype testing allows engineers to validate movement, pulling force and installation geometry under actual operating conditions before finalising the production design.
We also support replacement projects where an existing traction gas spring is no longer available or no longer provides the desired performance. By reviewing the application rather than simply copying the original part, we can often recommend an improved solution that better suits the equipment and its operating conditions.
From Small Batches to High-Volume OEM Production
Whether your project requires a small number of prototype samples or long-term serial production, Newtone supports customers throughout the complete product lifecycle. Consistent manufacturing processes, engineering support and application-focused design enable us to supply traction gas springs for both niche engineering projects and large-scale OEM production.
Frequently Asked Questions About Traction Gas Springs
What is a traction gas spring?
A traction gas spring is a gas-filled mechanical component designed to generate a controlled pulling force. Unlike a conventional compression gas spring, which pushes the piston rod outward, a traction gas spring keeps the rod retracted inside the cylinder and produces force in tension. This makes it suitable for applications where components need to be pulled, held closed or guided in a controlled manner.
What is the difference between a traction gas spring and a compression gas spring?
The primary difference is the direction of the force. A compression gas spring provides a pushing force, while a traction gas spring provides a pulling force. Although both products use compressed nitrogen gas, they are designed for different mechanical functions and cannot normally be used interchangeably without redesigning the application.
Are traction gas springs and tension gas springs the same product?
Yes. In most industries, the terms traction gas spring and tension gas spring describe the same type of product. Depending on regional terminology, they may also be referred to as traction gas struts, tension gas struts or pull type gas springs.
How is the pulling force determined?
The required pulling force depends on several factors, including the weight of the moving component, mounting geometry, stroke, opening or closing angle and the operating conditions of the mechanism. Engineering evaluation is generally recommended before selecting a traction gas spring.
Can traction gas springs be customised?
Yes. Traction gas springs can be manufactured with customised force values, stroke lengths, extended and compressed dimensions, end fittings and mounting configurations to match the specific requirements of each application.
Can a traction gas spring replace a compression gas spring?
Generally, no. Although both products belong to the same gas spring family, they operate in opposite directions. Replacing one with the other usually requires modifications to the mechanism and mounting geometry.
Which industries commonly use traction gas springs?
Traction gas springs are widely used in industrial machinery, railway equipment, medical devices, laboratory systems, defence applications, heavy equipment, machine guards and other specialised engineering applications where controlled pulling force is required.
Do traction gas springs require regular maintenance?
Traction gas springs are sealed components and generally require minimal maintenance. Periodic inspection of the mounting hardware, end fittings and piston rod is recommended. The piston rod should remain clean and free from corrosion, impact damage or contamination.
Can you manufacture prototype quantities?
Yes. Many projects begin with prototype quantities for design validation before progressing to serial production. We support customers throughout the development process, from prototype evaluation to high-volume OEM manufacturing.
What information is required to request a quotation?
Helpful information includes drawings, photographs, existing samples, dimensions, required stroke, estimated pulling force, operating environment and annual production quantity. If some of this information is unavailable, our engineering team can often assist by reviewing the application.
Can traction gas springs be manufactured in stainless steel?
Yes. Depending on the operating environment, traction gas springs can be manufactured using corrosion-resistant stainless steel materials for applications exposed to moisture, chemicals or outdoor conditions.
Does Newtone support OEM and replacement projects?
Yes. We work with OEM manufacturers developing new equipment as well as customers looking to replace existing traction gas springs, reviewing each application individually to recommend the most appropriate solution.
Related Technical Articles
If you would like to explore traction gas springs in greater detail, the following technical articles provide additional information on their working principles, applications, custom manufacturing and engineering considerations.
Related Products
Depending on your application, you may also be interested in the following Newtone product solutions designed for different motion control requirements.
Let’s Discuss Your Traction Gas Spring Application
Every traction gas spring application presents its own engineering challenges. Factors such as pulling force, stroke, installation geometry, operating environment and service life all influence the final product specification. Choosing the right solution at the beginning of a project can improve safety, reduce operating effort and contribute to long-term equipment reliability.
You are welcome to send us your technical drawings, CAD models, photographs, dimensions or even a sample of your existing gas spring. Our engineers will carefully evaluate the information provided and recommend the most appropriate traction gas spring for your application.
Need Engineering Support?
Our engineering team is available to assist with product selection, custom design, prototype development, OEM manufacturing and replacement projects. Contact us today to discuss your application or request a quotation.
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