Tension gas springs, also known as traction gas springs or pulling gas springs, are designed to provide controlled pulling force instead of outward pushing force. This article explains what tension gas springs are, how they work, how they differ from compression gas springs, and how to choose the right specification for applications that require closing, returning, or tensioning motion.
What Are Tension Gas Springs?
Tension gas springs are a type of gas spring designed to generate pulling force rather than pushing force. Unlike standard compression gas springs, which extend outward to lift or support a load, a tension gas spring usually stays retracted at rest and provides inward force when the piston rod is pulled out by an external load. This makes it suitable for applications where a part needs to be pulled back, closed smoothly, returned to position, or kept under controlled tension.
As a professional gas spring manufacturer, GASTAC provides standard and custom tension gas springs for applications that require controlled pulling force, smooth return motion, and reliable motion control. Products can be customized based on your required force, stroke, length, end fittings, and installation needs.
How Do Tension Gas Springs Work?
Inside a tension gas spring, the pressure tube, piston rod, piston, seals, and nitrogen gas work together to create controlled inward movement. At rest, the rod stays inside the cylinder. When the rod is pulled outward, internal gas pressure increases and creates resistance. Once the external force is reduced, the stored pressure pulls the rod back smoothly into the cylinder.
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Internal structure: A typical tension gas spring includes a pressure tube, piston rod, piston, seals, nitrogen gas, and end fittings.
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Rod movement: The rod is pulled outward by the connected component during operation.
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Gas pressure: The internal gas pressure helps resist sudden movement and creates the return force.
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Controlled return: When the external force decreases, the rod is pulled back inward smoothly.
Tension Gas Springs vs Compression Gas Springs
Tension gas springs work in the opposite direction of standard compression gas springs. A compression gas spring pushes the rod outward to lift, open, or support a component, while a tension gas spring pulls the rod back inward to close, return, or tension a component. This makes tension gas springs more suitable for applications where the design requires controlled pulling force instead of outward pushing force.
| Comparison Item | Tension Gas Springs | Compression Gas Springs |
|---|---|---|
| Force Direction | Pulling force / inward force | Pushing force / outward force |
| Rod Position at Rest | The piston rod normally stays retracted inside the cylinder. | The piston rod normally stays extended outside the cylinder. |
| Reaction to External Force | The rod is pulled outward, then returns inward when the external force is reduced. | The rod is pushed inward, then extends outward when the external force is reduced. |
| Main Funtion | Closing, returning, pulling, or tensioning. | Lifting, opening, supporting, or holding. |
Common Applications of Tension Gas Springs
As a professional gas spring manufacturer, GASTAC provides tension gas springs for applications that need controlled pulling force, inward return motion, or smooth closing assistance.
Bottom-hinged doors and access panels that need controlled pulling force during opening or closing.
Covers and lids that must be pulled open, pulled shut, or returned smoothly.
Mechanical assemblies that require stable tension, controlled return movement, or force compensation.
Belt drive systems where the spring works as a tensioner to help maintain proper belt tension.
- Custom industrial mechanisms that need a pulling force instead of an outward pushing force.
Key Specifications and Selection Tips
When selecting a tension gas spring, confirm the pulling force, stroke, length, material, end fittings, and working environment. These factors affect installation fit, pulling performance, and motion control. If you are unsure which model is suitable, share your application details with us, and our team can help recommend the right solution.
| Specification | Why It Matters |
|---|---|
| Pulling Force | Ensures proper closing, return, or tensioning force. |
| Stroke | Defines the movement distance of the rod. |
| Length | Helps confirm installation space. |
| Rod and Tube Size | Affects strength, stability, and durability. |
| Material | Depends on corrosion resistance and working conditions. |
| End Fittings | Affect mounting and connection compatibility. |
| Working Environment | Temperature, humidity, vibration, and corrosion affect selection. |
Custom Tension Gas Springs from GASTAC
As a professional gas spring manufacturer, GASTAC can provide different custom options for tension gas springs according to your application requirements. Available options may include the following. Contact us to discuss your custom tension gas spring needs.Steel or stainless steel material options
Custom pulling force based on the required load
Different stroke lengths for specific movement ranges
- Extended length and retracted length adjustment
- Rod and tube size combinations according to strength and space requirements
- Various end fittings, such as ball sockets, eyelets, clevises, or custom connectors
- Surface treatment options for durability and corrosion resistance
- Custom designs for compact or restricted mounting spaces
- Support for special applications that require smooth closing, inward return, or tensioning motion
FAQ About Tension Gas Springs
A tension gas spring is a gas spring designed to provide pulling force instead of pushing force. It is used when a part needs to be pulled inward, returned smoothly, or kept under tension.
A tension gas spring usually stays retracted at rest. When the piston rod is pulled outward, internal gas pressure creates a controlled force that pulls the rod back inward.
Tension gas springs pull inward, while compression gas springs push outward. Tension types are used for pulling, closing, returning, or tensioning.
Yes. Tension gas springs can be customized by pulling force, stroke, length, material, end fittings, and application requirements.
Ian Martin
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