Gas Strut Help
Gas Strut Dos And Don’ts
- Do store and install gas struts with the piston rod pointing down to ensure that the piston seal is kept lubricated.
- Do try to use ball joint fixings to help prevent side load forces.
- Do ensure the end fixings are in line to prevent side load forces.
- Do ensure the fixings are fully tightened onto the strut.
- Do provide physical stops to the struts limits – ie ensure the strut cannot be over extended or over compressed.
- Do avoid external side load forces on the gas strut or the end fittings.
- Do keep the piston rod clean from contaminate and debris.
- Do not lubricate a gas strut. They contain oil for damping and self-lubrication.
- Do not puncture or incinerate. SGS provides a disposal service at no cost.
- Do not grip, scratch, chip, bend or paint the rod.
- Gas struts are not designed to be cycled more than 15 times per minute.
- Gas struts should not be over-compressed or over-extended: provide physical stops to limit the strut’s extremes.
- Never attempt to re-gas/re-fill a strut. This is a hazardous operation.
Searching By OEM Part Number
Find the part number printed on the cylinder (the fatter part) of your old strut
- This is sometime blue text on black paint so can be faded and hard to read hard to read.
- Most struts have two part numbers, a force rating and a batch code printed on them.
- There are often multiple possible part numbers listed but you only need to match one number.
- When searching try removing all hypens '-' and spaces. If you still can't get a match try searching for just the start of the part number, or try replacing numbers and letters that could be confused eg the number '1' with the letter 'I'.
- For most gas struts we advise the use of ball joints to alleviate possible side load and uneven wearing of the piston rod / seals.
- Generally fit with the piston rod down and preferable within 60 degrees to the vertical and avoid having the gas strut travelling through a large arc. Install with the rod down for optimum lubrication of the guide and sealing system at all times.
- It is advisable to keep the strut in a single plane of movement to help prevent a reduced lifespan of the strut.
- Ensure that the end fittings are perfectly in line and that they are screwed all the way home. If the end fittings need aligning the piston rod of the gas strut can rotate inside the body (cylinder). Place and hold the piston end fixing on a firm, flat service, then grip the cylinder and firmly twist it until the end fittings are aligned correctly.
- If in any doubt as to the installation procedure please contact us.
- Gas struts lose force over a period of time; it is advisable to regularly check that they perform as originally intended. It is recommended that they are returned to the supplier for safe disposal at the end of their working life.
- To ensure safe and effective usage – and to enable long service life - gas struts must not be bent or subjected to any form of side-loading, by lateral forces or otherwise.
- No greasing or lubrication is required. Gas struts are entirely maintenance-free.
How to Adjust / Vent a Gas Strut
Please read before adjusting or mounting the gas struts. Failure to do so may invalidate your warranty.
Gas struts are filled with high pressure Nitrogen and under no circumstances should they be opened or subject to excessive heat.
- The internal pressure of a gas strut is very high and should be treated with caution.
- Using the allen key provided undo the grub screw until gas can be heard escaping. Then retighten the grub screw.
- Only release the gas in one second bursts to avoid releasing too much gas.
- Repeat the process until the gas strut is behaving as desired.
- In the case of multiple gas struts adjust them in an alternating order to keep them equal.
- Fit the gas strut with the cylinder uppermost. The adjustment valve located at the uppermost end of the cylinder.
- Gas strut must be upright with the valve at the top and the rod pointing down during adjustment to avoid excessive loss of oil.
- A small mist of oil may be ejected from the valve during adjustment – this is normal.
- Avoid excessive force when adjusting the grub screw as this may damage the grub screw.
- Under no circumstances should the grub screw be removed
Gas Strut Force Calculation
If you wish to fix gas struts to a new application then please see our free design service. We can specify the correct gas struts, mounting locations and brackets for your application. We also supply adjustable gas struts that allow you to vent gas from the strut (lowering it's force) once it has been mounted, until the exact force required is achieved. This is often a better option than using fixed force gas struts for a one-off application. See our adjustment instructions for further information.
Use the calculation below to work out the force needed in a gas strut.
(d) distance from the hinge is recommended at approximately 20% of the panel length.
(F) weight is the mass in Kg multiplied by 10.
- Gas struts are environmentally-friendly and low maintenance. However, they contain nitrogen gas at high pressure and thus must be fitted and used responsibly. A gas strut’s functional safety essentially comes from the smooth piston rod surface and the internal seal arrangement that seal gas inside the cylinder. Damage to the piston rod or seal will degrade the lifespan of the gas strut.
- Under no circumstances subject a gas strut to forces that put them under tensile stress or cause them to bend.
- Welding on to the gas strut, or modifying the gas strut without the proper equipment, is highly likely to cause failure and will void the warranty
- Chipping, scratching, denting, painting or heating of the piston rod must be avoided. Gas struts are self-lubricating: do not grease the rod or seals.