Office Chair Screws
There are various types of screws commonly used in office chairs, including socket head cap screws, hexagon socket screws with external drive, and star-shaped rubber-head screws. Different types of screws vary in material, strength, and application, and the specific choice should be determined based on the installed components and design requirements.
The type of screws used in office chair installation is closely related to their functional requirements. Socket head cap screws are one of the common types. For example, 12.9-grade black socket head cap screws in M3 and M4 sizes with recessed ends are typically used to secure components that require concealment or precise connections, such as the connection between the chair back and the seat panel. Their high strength (12.9-grade) and black coating enhance wear resistance and rust prevention, while the recessed end design facilitates a flush fit with the component surface, avoiding protrusions that could affect comfort.
Hexagon socket screws with external drive focus more on versatility and load-bearing capacity. For instance, supplied M8*20 black zinc-plated 8.8-grade hexagon socket screws with external drive are commonly used in components that need to withstand significant pressure, such as chair legs and armrests. The black zinc coating provides good corrosion protection, the 8.8-grade strength is suitable for medium-load scenarios, and the dual hexagon structure allows installation with either a hex key or a regular wrench, improving construction convenience.
Star-shaped rubber-head screws (such as M8 star-shaped rubber-coated bolts) combine functionality with aesthetics. Their rubber-coated design prevents the screws from scratching the component surface while providing some cushioning, making them suitable for parts that require frequent operation, such as chair wheels and adjustment mechanisms. The star-shaped head design avoids the issue of slippage common with regular cross-recessed heads, enhancing installation stability.
Additionally, some office chair installation guides mention classifications like Screw C, Screw D, Screw E, but without specifying exact sizes. These screws are usually customized based on the thickness of the components and the connection method. For example, short screws may be used for chair wheel installation, while long screws are needed for connecting the chair back to the seat panel. During actual installation, refer to the product manual or template to ensure that the screw length and diameter match the hole positions, avoiding looseness or damage due to non-compliant specifications.
When selecting screws, strength grade is a key indicator. High-strength screws (such as 12.9-grade) are suitable for parts that require long-term load-bearing, while regular screws (such as 4.8-grade) are used for light-load scenarios. Meanwhile, the coating type (such as black zinc, nickel-plated) affects rust prevention performance and should be chosen based on the usage environment (such as humid or dry conditions).
