Office Chair Screws
There are various types of screws commonly used in office chairs, including 12.9-grade black hexagon socket set screws, M8*20 black zinc 8.8-grade anti-slip hexagon socket screws with both internal and external hexagons, and furniture screws with semi-circular heads, internal hexagons, washers, and embossed patterns.
The 12.9-grade black hexagon socket set screw is a common type in office chairs. With a strength grade of 12.9, it is a high-strength screw capable of withstanding significant tensile and shear forces, ensuring the structural stability of the office chair. Its black color usually results from surface treatment, providing both rust resistance and an aesthetically pleasing appearance. The internal hexagon design allows for easy installation and removal using an Allen wrench, with minimal risk of slippage. Common sizes include M3 and M4, with different sizes suitable for various parts of the office chair, such as the connection between the chair legs and seat, and the fixation of the chair back.
The M820 black zinc 8.8-grade anti-slip hexagon socket screw with both internal and external hexagons is also frequently used in office chairs. Its 8.8-grade strength meets the daily usage requirements of office chairs. The black zinc surface treatment not only provides rust resistance but also enhances the screw's appearance. The anti-slip teeth design increases the friction between the screw and the connected part, preventing loosening during use. The structure with both internal and external hexagons offers flexibility in tool selection, allowing the use of either an Allen wrench or an external hexagon wrench. The M820 size indicates a nominal diameter of 8 millimeters and a length of 20 millimeters, suitable for parts requiring significant connection force, such as the connection between the chair legs and the five-star base.
Furniture screws with semi-circular heads, internal hexagons, washers, and embossed patterns are also applied in office chairs. The semi-circular head design ensures a tight fit between the screw head and the surface of the connected part, minimizing damage to the surface. The internal hexagon structure facilitates installation and removal. The washer design increases the contact area between the screw and the connected part, distributing pressure and improving connection stability. The embossed pattern further enhances the screw's anti-slip performance. Common sizes include M6 and M8, suitable for connecting parts such as the chair seat and backrest in office chairs.
