Wondering what size gas struts you need for your project? Whether you’re replacing worn-out gas struts or working on a completely new application, choosing the correct size is crucial. Using the wrong gas strut can lead to performance issues, damage to your installation, or even safety hazards. Luckily, figuring out the right size doesn’t have to be complicated, especially with the tools and tips we provide.
Why the right gas strut size matters
A gas strut that’s too strong may damage your lid or door. One that’s too weak won’t keep things open. The correct size determines how far the strut opens, how much weight it can support, and how it fits into your setup. The wrong dimensions or force can cause problems like slamming, jamming, or even early failure.
That’s why it’s essential to calculate or confirm the size before you order. Not sure where to start? We’ll walk you through it step by step.
What measurements do I need to choose gas struts?
To answer the question “what size gas struts do I need?”, you’ll need to gather some key information first:
- Extended length: the full length of the gas strut from centre to centre of the end fittings when open.
- Compressed length: the length when fully closed.
- Stroke: the difference between extended and compressed lengths.
- Force in Newtons (N): either printed on the gas strut or calculated based on your application.
- Mounting points: where and how the struts will be attached.
Once you have these details, you’re ready to use one of our online tools.
Use our free tools to calculate the correct size
We’ve made it easy for anyone to find the perfect gas strut size using one of our three tools , each designed for different needs.
Gas spring calculator tool
This is the go-to tool for new projects. Not sure what force or length you need? Simply enter parameters like dimensions, weight, angles, and mounting points. Our gas spring calculator will do the hard work and recommend the ideal gas strut for your application.
Gas spring replacement tool
Already have a gas strut but don’t know the specs? Just enter (part of) the product number into our replacement tool and we’ll show you compatible options. Perfect if your old strut’s label is still legible.
Gas spring configurator tool
Know what you’re doing? Use our gas spring configurator to customise your gas struts by choosing the exact length, force, mounting and material. You can even view your custom gas strut in 3D before placing the order.
Real example: selecting the right struts for a storage hatch
A customer contacted us asking: “What size gas struts do I need for my garden storage box?” They didn’t know the weight but had rough dimensions. Using the calculator, they entered the lid length, estimated weight and angle. The tool recommended 2x 8/19 gas struts with 400N each. We shipped them the same day, and they installed the struts successfully using our step-by-step guide.
Common gas strut sizes and applications
Here are some typical gas strut sizes to give you a reference:
- 6/15 (M3) – Small struts for furniture, cabinets and lightweight lids.
- 8/19 (M6) – Ideal for small hatches, toolboxes and access panels.
- 10/22 (M8) – Medium duty use like car boots or equipment covers.
- 14/28 (M10-M14) – Heavy-duty applications like machinery, doors or hatches.
Each size is available in different lengths and force ranges, so make sure to calculate or replace based on your exact specs.
Mounting tips for best performance
Even the right gas strut can perform poorly if mounted incorrectly. Here are some tips:
- Always mount the gas strut rod-down to keep the seal lubricated.
- Maintain an installation angle of less than 60° from vertical for optimal damping.
- Use appropriate brackets or ball joints for a secure and lasting fit.
You can find all compatible mounting parts in our product section.
Need help? We’re here for you
Still unsure what size gas struts you need? Don’t worry, we’re happy to help. Just send us the dimensions of your lid or hatch, along with photos if possible. Our support team will check your design and recommend the correct size, force, and configuration.
Frequently asked questions
How do I know what size gas struts I need?
You’ll need to measure the extended and compressed length of your current gas strut and determine the required force in Newtons. If you’re not sure, use our gas spring calculator to calculate it.
Can I replace gas struts with a different size?
Sometimes, yes. As long as the mounting points, stroke and force match. But it’s always safest to find a direct replacement using our replacement tool.
What if I don’t know the force I need?
No problem! Use our calculator tool and enter the weight, dimensions and opening angle. The tool will recommend a force in Newtons.
Are gas struts adjustable in size or force?
No, gas struts are not adjustable once pressurised. You need to select the correct size and force before installation. Our configurator helps you do this with ease.
What’s the best mounting position for gas struts?
Gas struts should always be mounted rod-down, and the mounting angle should not exceed 60° from vertical. This ensures smooth operation and prolongs lifespan.
