A gas strut consists of a piston rod which moves in a closed cylinder under pressure. The piston rod has a piston at the end which prevents it from sliding out of the tube and which guides the piston rod. The distance that the piston travels in the cylinder from the piston rod during a back and forth motion is called stroke. The force of the gas strut is calculated by multiplying the cross-section of the piston rod times by the pressure in the tube. The higher the gas pressure, the higher the force of the tube.
Filling the gas strut with non-flammable nitrogen has the advantage that the relatively large gas molecules can be better prevented from escaping from the tube by the seal. Oil present in the tube serves for sealing and lubrication.
The piston has a pre-set throttle nozzle that allows the nitrogen to pass from one side of the piston to the other.
The tube contains a small amount of oil to lubricate the rod and to control damping at the end of the stroke. Gas struts should always be mounted with the rod downwards to prolong their service life. However, the throttle setting can only be changed in large series.
Our range of gas struts includes gas struts with welded ends, brackets, end fittings and locking tubes for gas struts, as well as traction gas struts.
Gas Strut Applications
Gas struts are often used in the automotive industry. Do you need a suitable gas strut for the tailgate of your car? Since a considerable number of cars and vehicles and their variations exist, we cannot, unfortunately, directly assign gas struts. Please enter the following data in our table to find the gas strut you are looking for or an alternative with possibly a slightly shorter length so that the hood or tailgate opens a few degrees less:
- Piston rod diameter with corresponding thread
- Tube diameter
- Extended length / stroke
- Compressive force in Newton or specification in kg all usually engraved on the tube
- Mounting thread / end piece
If you would like to order end fittings, please note the dimension in mm of the connection (ball) attached to the vehicle.
Gas struts are also used for balancing doors, flaps and hoods and also for supporting muscle power to close doors, flaps and hoods in a controlled manner. Further, gas struts are used for RV beds and windows, as well as in the furniture industry, for shipbuilding, agriculture, food technology and medical technology.
Mounting a Gas Strut
The piston rod of the gas strut should normally be at the bottom when at rest, as the oil present in the cylinder on the seal and the guide ensures a longer service life. The minimum angle to the horizontal should be 30° with the piston rod pointing downwards. This also applies to the storage of gas struts. On request, we are able to supply gas struts for series which allow horizontal installation of the gas strut due to special grease fillings. Gas struts are suitable for usage in temperatures between -30°C to +80°C and have a different force depending on the temperature (gas expansion). Radial forces (transverse to the piston rod) must be avoided. Do not lubricate the outer piston rod with grease or oil. Keep the piston rod free of dirt and dust. Do not use oils or solvents for cleaning. Only 90% of the complete stroke should be used in order not to continually move the quantities of grease and oil at the end of the stroke.