Office Chair Thread Specifications

The common specifications of threads for office chairs mainly involve two parts: screws and universal wheels, as detailed below:

I. Hardware Screw Specifications for Office Chairs Office chairs utilize a variety of hardware screw specifications, with common ones including M3, M4, M8, etc. Some high-strength screws even cover a wide range from M1.4 to M12.

1. Internal and External Hexagonal Screws: Among the internal and external hexagonal screws supplied for office chairs, there is a specification of M8×20, meaning the thread diameter is 8 millimeters and the length is 20 millimeters. These screws are typically used in areas requiring high connection strength, such as the fixation of chair legs to the seat.
2. Semi-Round Head Internal Hexagonal Screws with Washers and Embossing: These screws commonly come in specifications of M6 and M8. Their design combines the aesthetic appeal of a semi-round head, the convenience of internal hexagonal installation, and the anti-loosening function of washers, making them suitable for scenarios requiring stable connections, such as chair backs or armrests.
3. 12.9-Grade High-Strength Cup Head Internal Hexagonal Screws: These screws have a specification range from M1.4 to M12, covering the fixation needs from tiny components to large structures. The 12.9 grade indicates extremely high tensile strength, making them suitable for core components of office chairs that bear heavy loads, such as the connection between the gas lift and the seat.

II. Thread Specifications for Office Chair Universal Wheels The thread diameter of universal wheels directly affects their compatibility with chair legs, with common specifications being M8 and M10:

1. M8 Threads: These have a standard diameter of 8 millimeters with minimal tolerance, suitable for most standard chair legs. They offer high stability and easy installation, making them a common choice for small to medium-sized office chairs.
2. M10 Threads: These actually measure between 9 to 10 millimeters in diameter, with a tolerance of about 1 millimeter. This specification is typically used for large office chairs or industrial chairs that require higher load-bearing capacity, helping to distribute pressure and enhance durability.

III. Key Factors in Specification Selection

1. Load-Bearing Requirements: High-strength screws (such as 12.9 grade) and M10 universal wheels are suitable for heavy-duty office chairs, while ordinary screws and M8 universal wheels meet daily use needs.
2. Installation Compatibility: It is necessary to select matching thread specifications according to the aperture of the chair legs to avoid looseness or inability to install due to excessive tolerance.
3. Usage Scenarios: Office chairs that are frequently moved are recommended to use M10 universal wheels to enhance stability, while fixed office chairs can prioritize M8 to reduce costs.

By reasonably selecting thread specifications, the structural safety and usage comfort of office chairs can be ensured.