Chair Gas Lift Classes: Features, Load Capacities, and Differences

A gas lift is a gas spring installed between the chair mechanism and the base. It regulates seat height and ensures smooth raising and lowering of the chair. Gas lifts are used in children's, office, computer, and gaming chairs. Depending on their design and intended use, they vary in class and load-bearing capacity.
The gas lift class indicates the product's strength and structural design. Classes 1, 2, 3, and 4 are the most commonly used. Different classes are applied to chairs based on their intended use:

Class 1 — primarily children's chairs
Class 2 — children's chairs with a higher load capacity
Class 3 — office and computer chairs
Class 4 — heavy-duty office and gaming chairs

Important: The gas lift class is not a universal indicator of load capacity. The actual load capacity depends on the specific model and manufacturer.

•    Standard option for lightweight designs
•    Used primarily in children's chairs
•    Suitable for lighter users
•    Approximate load capacity: up to 80 kg
•    Provides smooth height adjustment
•    Ideal for lightweight children's models
For children's chairs, both the gas lift's load capacity and its height adjustment range are crucial. The range must accommodate the child's height and allow the chair to be correctly adjusted to the height of a writing or study desk.

Class 2 gas lift
•    Reinforced construction compared to Class 1
•    Used in children's chairs with a higher load capacity
•    Approximate load capacity: up to 100 kg
•    Suitable for regular home use
•    Ensures stable height adjustment
•    Provides greater structural durability for the chair
A Class 2 gas lift can be used in children's models designed for long-term use and a wider range of user weights.

•    One of the most common options for office and computer chairs
•    Approximate load capacity: up to 120 kg
•    Suitable for daily and prolonged use
•    Features a more robust construction and higher load capacity
•    Used in standard office and computer chair models
•    Ensures stable height adjustment during use
Class 3 is well-suited for most standard office chairs designed for regular work at a computer or desk.

•    Heavy-duty version for office and gaming chairs
•    Approximate load capacity: up to 150 kg
•    Designed for high loads
•    Used in heavy, robust chair designs
•    Suitable for intensive use
•    Offers a higher safety margin compared to lower-class gas lifts
Class 4 is commonly used in large office and gaming chairs that require superior structural strength.

Not entirely. The gas lift is just one of the structural components that determine load capacity. The maximum load is also influenced by:

the seat and backrest frame
the chair mechanism
the base
fasteners
casters
the seat structure

Therefore, a class 4 gas lift does not automatically mean that the chair can withstand 150 kg. If the manufacturer declares a maximum load of 120 kg for a specific model, then this indicator is decisive. When choosing an armchair, it is important to take into account not only the gas lift class, but also the maximum load of the entire structure declared by the manufacturer. It shows what user weight a specific model is designed for.