Frequently Asked Questions

Gas struts are pressurised using nitrogen and oil. The struts are completely sealed to keep the gas and oil from leaking out. The struts reach a maximum point of extension under no load (or the weight it was intended to support).

When pressed down, the nitrogen compresses, and the oil acts as a dampener to smooth out the movement of the strut. When removing the load, the strut will return to its maximum point of extension. That allows you to hold hoods and trunk lids open, adjust your seat height, or slow down the speed at which a door closes.

Gas struts are loaded with gas (i.e. nitrogen) to a specific pressure. Gas struts tend to fail over time from bad seals and general use.

However, there are times when the struts will fail instantaneously, either losing the ability to support the load or blow apart. While neither scenario is preferred, a slow leak is generally easier to manage and fix.

Struts can fail due to several reasons, including pressure loss due to poor design or bad seals, improper use and overloading, or corrosion and wear.

To determine the length of the gas strut, use the following formula (length of door x 0.60 (60%)). In this scenario, a door of 1000mm in length would need a strut with a length of 600mm.

To determine the force required by the strut use this formula ((dead weight of door x half the length of door) / mounting distance from the hinge) + (15% divided by the # of gas struts needed). It's a little more complex than the previous formula, but it works. In most cases, you can find the information for your existing strut on the strut itself.

Over time, gas struts can lose pressure. There are two primary reasons why this happens. One is normal wear and use, while the other is damage. Quality gas struts will take years to lose enough pressure to become an issue.

However, damaged struts can fail at any time. If the gas strut is damaged, it probably will need to be replaced. However, gas struts can be regassed if they aren't damaged. Plus, regassed struts will work for many more years when used properly.

As gas struts are subjected to high pressures, it's best to have a professional handle the replacement. However, you can replace them on your own if you desire.

To replace a gas strut, you will need to support the load you are working on (i.e. door, hood, chair) so that it does not fall on you when it is disconnected. Once you have the tools needed to remove the gas strut, it's a simple process of removal and replacement. You will need to have the proper measurements (i.e. length, diameter, pressure) and the installation is the reverse of the removal.

Again, gas struts are highly pressurised and dangerous. Installed improperly and they can fail. While it is possible to do this on your own, it's highly recommended that you let a professional handle this for you.