Wooden Office Chair Screws
The commonly used screw sizes for wooden office chairs are coarse-thread screws with diameters of 4mm (M4), 5mm (M5), and 6mm (M6), with lengths typically ranging from 20mm to 50mm. For solid wood office chairs, a common size is a diameter of 6mm and a length of 30mm, with specific sizes varying depending on the design, brand, and model.
Screws of different diameters serve different functions in wooden office chairs, and their selection should be based on the specific usage scenario and load-bearing requirements:
M4 Screws: With a smaller diameter, they are suitable for lightly loaded parts. For example, at the connection between the chair back and the seat, and the fixing of armrests to chair legs. These areas usually do not need to bear significant weight. The thin diameter design of M4 screws can meet the connection needs while avoiding wood cracking due to overly thick screws, and facilitating installation and adjustment.
M5 Screws: They have relatively strong load-bearing capacity and are suitable for moderately loaded parts. For example, at the connection between chair legs and the seat, and the reinforced fixing of the chair back to the legs. These areas need to bear part of the human body's weight or the stress generated by frequent activities. The diameter and thread design of M5 screws can provide a firmer connection, reduce the risk of loosening, and extend the chair's service life.
M6 Screws: They have the strongest load-bearing capacity and the best stability, suitable for heavily loaded or core support parts. For example, at the central support of the seat and the connection between chair legs and the ground. These areas directly bear the main weight of the human body or need to remain stable for a long time. The thick diameter and long threads of M6 screws can penetrate deep into the wood, forming a more reliable mechanical fixation and ensuring the overall structural stability of the chair.
In addition, the selection of screw length should match the thickness of the wood. If the screw is too short, it may not fully penetrate the wood, resulting in an insecure connection; if it is too long, it may penetrate the wood surface, affecting aesthetics or damaging other components. Therefore, before installation, measure the wood thickness and select a screw with a length slightly greater than the total wood thickness (usually leaving an embedding allowance of 2mm to 5mm) to ensure that the screw can be firmly fastened in place without protruding.
