Questions about delivery, returns and complaints
The delivery time for small quantities of HAHN standard gas springs is approximately 1 week. For larger ordered quantities and custom-made items, the delivery time can be significantly longer. Please ask your contact partner at HAHN Gasfedern
No, since HAHN manufactures gas springs to order, it is unfortunately not possible to return functioning gas springs.
If you have any technical complaints or discover defects with the products we supply, please contact our Customer Service Team. Please do not send us the affected parts until you are given authorization so that we can analyze them ourselves.
Our customer order numbers are consecutive due to the variety of gas springs that we offer. A new customer order number is assigned for each order. You can find the customer order number on your gas spring.
No, gas springs do not require CE marking and are not covered by the Machinery Directive 2006/42/EC.
Hahn Gasfedern can always serve the individual needs of both private and industrial customers. There is no minimum order size.
Questions about installation and maintenance
Gas tension springs, gas pressure springs, and dampers must always be installed with the piston rod pointing downwards. If gas springs are installed incorrectly, then the seal is not in the oil, which increases the risk of a slip-stick effect and thus increases the chance
of the gas spring failing more quickly. In addition, a gas pressure spring that is installed in the wrong direction has no end position damping. One way to get around this is to use a gas spring with a grease chamber. Here, it can be installed in either direction, but in this situation as well
there is no end position damping of the gas pressure spring. You can find details about this in our technical specifications.
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No, gas springs are maintenance-free. To ensure the unrestricted functionality of the spring, you can remove dirt from the piston rod using clean water.
It is not mandatory, but in extremely dirty conditions it is advisable to install the gas spring with a scraper or protective tube. These allow you to extend the service life of the gas spring. A scraper prevents dirt from getting into the gas spring. In particularly harsh conditions, such as
with street sweepers, you can protect the piston rod from external influences and thus from possible damage using a protective tube.
Gas springs should not be stored as stock items. If you nevertheless need to store your gas springs, the procedure is the same as for installation. Compression gas springs must be stored with the piston rod pointing downwards, and tension gas springs with the piston rod pointing upwards. For
more information, see our technical specifications.
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If stored as directed, no pressure losses should occur, but the products should not be stored for longer than one year. When the gas springs are operated for the first time after a long period of rest, a sticking effect, the so-called slip-stick effect, can occur. In this case, higher forces
are required to extend or retract the piston rod. If stored improperly, the seal may stick to the piston rod, causing the seal to be damaged when the gas spring is actuated.
Yes, especially after a long period of storage, this slip-stick effect can occur when the piston rod is operated for the first time. This effect can occur whenever the static friction is greater than the sliding friction.
Yes, gas pressure springs, gas tension springs, and dampers may be used as end stops if the nominal force +30% is not exceeded. Mechanical stops should be additionally installed, especially in the case of high forces, to prevent compression or overstretching of the product.
Yes, the tolerance for piston rods and cylinder tubes is +/- 2 mm.
In most cases, repair is not possible. If you have any complaints, please contact our Customer Service Team.
Questions about the product and how it works
Gas springs work by compressing gas (nitrogen) in a cylinder. You can find more information here
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HAHN gas springs are filled with nitrogen to prevent oxidation.
The weight of a gas spring varies between 20 g and 10 kg, depending on the size and model.
Progression refers to the increase in the extension force caused by the compression of the gas when the piston rod is retracted. It depends on the diameter of the piston rod and the volume of the cylinder.
Yes. Contact between the seal and the piston rod and the piston on the inside of the pressure tube creates a frictional force. This frictional force counteracts the direction of movement of the piston rod. That means when extended, the gas spring force is reduced by the friction. To insert the
piston rod, a force increased by the friction must be applied.
The temperature range for which a gas spring is suitable depends on its seal. HAHN has gas springs suitable for use from -40° to +200°C. You can find more information about NT (Low Temperature) gas springs and HT (High Temperature) gas springs from HAHN in our HT/NT gas springs flyer (pdf).
Yes, our gas springs are both RoHS and REACH compliant. We are also certified in accordance with ISO 9001, ISO 14001, and ISO 45001.
HAHN supplies gas springs with extension forces ranging from 5 to 10,000 N, depending on the series.
Yes. For special applications, e.g., in medical technology, the chemical and food industries, as well as ship and yacht building, HAHN manufactures gas springs from high-quality stainless steel. These springs are rustproof and chemical resistant. Optionally, we can use an oil that complies with
FDA regulations.
The maximum stroke varies depending on the series. The standard strokes can be found in our catalogues and flyers; individual adjustments are possible on request.
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Depending on the series, the pressure is approved up to a certain maximum value. The filling pressure ranges from 10 to 160 bar in the HAHN Gasfedern product range.
Our standard gas springs are painted black. Our gas springs are also available in other colors upon request. You can also get the cylinder tubes galvanized in steel or stainless steel (V2A (AISI 304) and V4A (AISI 316)) upon request. And if you want a totally customized solution, you can give
your gas springs a very special look with our DipPrint process.
