How does a Gas Spring or gas strut work?

Gas springs, also known as gas struts, are versatile devices that provide support and motion control in various applications, from automotive to furniture. These components function by utilising compressed gas, contained within a cylinder and compressed by a piston, to exert a force. This force is typically used to support the weight of an object, making it easier to lift or sustain in an open position. The key to their operation lies in the balance between the gas pressure and the mechanical parts of the strut, allowing for smooth and controlled movement. Gas springs can be designed to provide different levels of resistance, making them suitable for a wide range of uses.

How a gas Spring / gas strut works!


A gas strut or gas spring is a sealed energy source containing an inert gas (nitrogen) and oil. Being self-contained units, these useful devices require no power source or maintenance.


Nitrogen is forced under pressure into the cylinder of the unit. The internal pressure exceeds atmospheric pressure and generates an outward force on the rod, making the rod of the unit extend.


With the pressure being equal on both sides of the piston, there is more force acting in direction ‘B’ than in direction ‘A’. This forces the rod of the gas spring out.


When the rod is compressed into the cylinder, the internal pressure and the output force increase according to the volume displaced by the rod. On extension or compression, gas is metered from one side of the piston to the other via a small orifice.


Gas Springs showing End Fittings

What type of gas Spring / gas Strut do I Need?

Find the perfect gas spring for your needs with our information guide. Whether you're looking for smooth motion control in automotive, furniture, or industrial applications, our comprehensive resource explains the various types of gas springs available and how to choose the right one. Click here to learn more about selecting the ideal gas spring for your specific requirements. 

What Size gas Spring / gas Strut do I Need?

Explore our essential guide to finding the right size gas spring for your project. Understanding the correct specifications is crucial for optimal performance, whether it's for vehicles, medical equipment, or any other application. Click here to read our detailed resource on choosing the appropriate gas spring size for your needs.

Speak to our experts

To help with selecting the right gas spring for your application please call to speak to one of our experts on +44 1623 551 800 or submit the form below. Our team is always happy to help you find the best gas spring for your application and give you any additional information you require.