Office Chair Components Description

The core components of an office chair include gas lift rods, bases, chair legs, wheels, and other auxiliary structures. The functions and characteristics of each component are as follows:

1. Gas Lift Rod (Gas Spring/Pneumatic Spring)
The gas lift rod is the core component for adjusting the height of an office chair. It operates by changing the volume of high-pressure nitrogen gas inside the cylinder, combined with manual or electric control to achieve seat elevation. Safety is a key indicator: Legitimate products must pass international certifications such as SGS and BIFMA and be equipped with explosion-proof steel plates to prevent parts from flying in the event of cylinder rupture. Some low-end products may pose risks of gas leakage or explosion due to poor cylinder sealing or inferior materials, so it is essential to verify certification marks when selecting.

2. Base
The base is located beneath the seat cushion and serves as the "central hub" connecting the gas lift rod, backrest, and five-star chair legs. Its core functions include:

• Fixing and Connecting: Securing various components with bolts or clips to ensure overall stability;
• Reclining Adjustment: Internal springs or torsion springs provide the force for the backrest to recline. High-end bases (such as synchronous tilting bases) enable linked support between the seat cushion and backrest, meaning the front of the seat cushion tilts upward when reclining to fit the body's curves;
• Functional Expansion: Some bases are equipped with locking mechanisms (to fix the reclining angle) or tension adjustment knobs (to control reclining resistance) to accommodate users of different weights.

3. Chair Legs (Five-Star Legs)
Chair legs are the foundational components supporting the body's weight. Common materials and their characteristics are as follows:

• Nylon Legs: Lightweight and quiet when moving, but with relatively weak load-bearing capacity (usually ≤100kg), suitable for light office settings;
• Steel Legs: Strong load-bearing capacity (up to 150kg or more), but attention should be paid to the quality of the electroplated layer to prevent rusting;
• Aluminum Alloy Legs: Combining lightweight design with high strength, these offer the best load-bearing performance (usually ≥150kg) but are more expensive and mostly used in high-end models.

4. Wheels (Casters)
Wheels are paired with five-star legs to enable 360-degree rotation and movement. The material is primarily nylon, with surface smoothness affecting movement fluidity. Some wheels are wrapped with soft materials (such as PU) on the outer layer to protect the floor. Note: Hard wheels should be used on carpets, while soft wheels should be used on hard floors (such as tiles or wooden floors) to avoid scratching the surface or increasing movement resistance.

5. Other Components

• Backrest and Seat Cushion: These form the main body of the seat. Some high-end models are equipped with lumbar supports (to support the lumbar spine) or mesh designs (for better breathability);
• Swivel Chair Components: Including gas rods (note that thermal expansion and contraction may cause elevation jams) and chair leg decorative pieces (such as wooden legs, which enhance aesthetics but have weaker load-bearing capacity).

The component configurations of different types of office chairs (such as executive chairs and staff chairs) may vary, but the core structures revolve around the above components. When selecting, it is essential to consider usage scenarios, body weight, and budget comprehensively.