Office Chair Cylinder Classification

The international standard for office chair cylinders classifies them into four levels, from 1 to 4, with higher numbers indicating stronger safety performance. The specific characteristics of each classification are as follows:

Level 1 cylinders have a relatively small adjustment range, typically allowing height adjustments only within a limited range. Their design is primarily aimed at seating scenarios that require only basic height adjustments, such as simple office or home chairs. These cylinders have a relatively simple structure and lower cost, but their functional limitations are evident, meeting only the most basic usage needs and performing generally in terms of safety. They are suitable for environments with low requirements for chair functionality.

Level 2 cylinders offer a larger adjustment range than Level 1, allowing users to adjust within a wider height range. They are suitable for chairs with certain height adjustment needs, such as office chairs or computer chairs used for extended periods. However, Level 2 cylinders have lower safety levels. With the industry's increasing safety standards, they have largely been phased out or are only suitable for basic usage scenarios with low safety requirements.

Level 3 cylinders are the mainstream choice in the market, meeting the daily office needs of the vast majority of users and providing good safety assurance. They must pass at least 24,000 lift-cycle fatigue tests to ensure stability and reliability during long-term use. The cylinder wall thickness is typically around 2.5 millimeters, often in stainless steel color, and can usually support normal usage weights of up to 150 kilograms, suitable for most office scenarios and people of average weight.

Level 4 cylinders are currently recognized as the safest level, with the strongest explosion-proof performance and the longest service life. They must pass more than 50,000 lift-cycle fatigue tests and more stringent pressure tests, such as 120,000 pressure tests without leakage, to ensure safety under extreme usage conditions. The cylinder wall thickness is usually ≥3 millimeters, often black (after reinforcement treatment), and can withstand greater weights, typically supporting over 200 kilograms. They operate with less vibration and better stability, suitable for scenarios with extremely high safety and stability requirements, such as high-end office chairs or special work environments.