Gas Spring


Chair gas springs are designed especially for variable and comfortable seat height adjustment of office swivel chairs, task & executive chairs. This is made possible by the patented double cylinder system, consisting of a pressure tube and a guide tube. The self-supporting pressure tube is designed to allow bending moments, for example if the load on the seat is not centered.

Read more about Gas Spring Technical Function

Gas springs are hydro pneumatic adjustment elements. The gas spring is filled with non-toxic nitrogen under high pressure. This produces a charging pressure that acts on the cross-sectional area of the piston rod. This generates the extension force. If the extension force of the gas spring is higher than the force of the counterweight, the piston rod extends. If the extension force is lower, then the piston rod retracts. The flow cross-section in the damping system determines how quickly the extension occurs. In addition to nitrogen, there is a defined amount of oil in the interior for lubrication and end position damping. The suspension comfort of a gas spring can be determined as needed and for the respective task.

Gas spring

Properties and Advantages of Swivel Chair Gas Springs from WinWorld

flashAvailable in different classes based on customer request

flashAvailable in different lengths and strokes

flashSwiveling and non-swiveling versions

flashComplete columns with different outer tube versions (Black or Chrome electroplated)

flashDifferent conic length adopted with your bases and mechanisms

Gas spring Pressure

As can be seen from the graphic, the spring characteristic represents the force progression of the gas spring over the stroke, from the extended to the compressed state and back. In the process, the spring characteristic value represents the force ratio F2/F1. When designing a gas strut, the force F1 is the most important criterion in addition to the dimensions. The force F1 is measured 5 mm before the end of the extension movement, thus defining the value of the spring force. The force FR resulting from the friction is created between the force lines in the compressed and extension direction. The extension speed is divided into two types of damping: With the standard gas spring, the extension speed is controlled via a pneumatic and hydraulic range. When installing the gas strut with piston rod facing down, the piston first moves through the gas-filled part (pneumatic area), then through the oil-filled part of the pressure tube (hydraulic area). The piston rod is braked by the oil.
If desired, the damping can also occur dynamically. For this purpose, a longitudinal groove is provided in the pipe, which allows for a positionally-independent damping of the gas spring.

Pressure-Displacement diagram

Gas spring class

Gas springs are mainly selected by their manufacturing class. Different metal thicknesses in main body and cover and its strength against exerted moments cause to provide different solutions. Here are mainly points to be remarked when ordering.

Class 1: 1.2 mm spindle pipe and 1 mm spindle guide. (Not recommended!)
Class 2: 1.5 mm spindle pipe and 1 mm spindle guide. (Standard)
Class 3: 2.0 mm spindle pipe and 1.5mm spindle guide. (Heavy duty)
Class 4: 2.5 mm spindle pipe with QPQ treatment and 1.5mm spindle guide. (Super Heavy duty)

Type of ending joints


Formed metal


Displacement stroke:

Based on the chair height standard and its specification, different strokes are recommended. Usually following rules are considered
Stroke 60 mm: Heavy managerial/executive chairs
Stroke 80 mm: Normal managerial chairs
Stroke 100-120 mm: Staff chairs
Stroke 150-210 mm: Counter chairs
Stroke 260 mm: Bar chairs

Some additional useful information about packing and container arrangements

Depending on type of packing (wrapped by Kraft paper or polybag and sizes of the cartons), Different calculations are available, but following instruction may provide an idea for us:


Our advantages:

flashF2 pressure is customer-ordered

flashStandard tube diameter: 28 mm & 50 mm and also non-standard outer tube diameter: 38 mm, 40 mm, 50.8 mm

flashGas spring dimensions may be customized per request

flashSamples for free

flash3-5 years warranty

flashSGS, BIFMA X5.1, TUV, EN1335, DIN4550, LGA, ISO9001:2008 Certified

flashHigh quality ABS protection shell

flash100000 times fatigue test

flashGas spring are stored for over 7 days to ensure the quality before delivery