Office Chair Universal Screws
The commonly used types and specifications of universal screws for office chairs mainly include hexagon socket screws, semi-round head knurled furniture screws, and screws with metal washers, with M6 and M8 being the most common specifications for hexagon socket screws. Here is a detailed description of these screw types:
Hexagon socket screws are one of the most frequently used connectors in office chairs. Their heads are designed in a hexagonal shape and require a hexagon socket wrench for installation and removal. This design allows the screw heads to be fully embedded into the chair structure, resulting in a flat and aesthetically pleasing surface that is less likely to be accidentally loosened by external forces. M6 and M8 are the mainstream specifications for hexagon socket screws in office chairs. M6 is suitable for connecting lighter or smaller components, such as fixing the chair back to the seat panel. M8 is more commonly used for heavier-duty structures, such as connecting the five-star base to the gas lift or reinforcing the connection between the seat and the chassis. When selecting, it is necessary to determine the specification based on the thickness and load-bearing requirements of the specific component to avoid unstable connections due to overly thin screws or inability to fit into the reserved holes due to overly thick screws.
Semi-round head knurled furniture screws have a semi-circular head with a knurled texture on the surface. This design increases friction, facilitating manual tightening, and prevents the screws from loosening due to vibration during long-term use. They are typically used for components that require frequent disassembly or adjustment, such as the chair back angle adjustment mechanism and the connection between the armrests and the seat. Their specifications are usually indicated by diameter and length, for example, '4ร20' means a diameter of 4 millimeters and a length of 20 millimeters. The specific choice should be based on the thickness and hole diameter of the connected material.
Screws with metal washers have an additional metal washer below the screw head. The function of the washer is to distribute pressure and prevent damage or indentation to the material surface when the screw is tightened, making them particularly suitable for connections with wooden or soft materials (such as plastic or thin metal sheets). These screws are commonly found in scenarios such as fixing the armrests of office chairs and connecting the seat to the chassis. When selecting, it is necessary to consider the screw diameter, length, and washer size simultaneously to ensure that the washer can fully cover the connection surface and provide uniform support.
