Office Chair Screw Allocation
The screw allocation for office chairs varies depending on the brand and structural design, but the screw specifications and quantities for common parts can be referred to as follows:
Connection between the base and the backrest: This part typically uses M8x30 screws (8mm in diameter and 30mm in length). For example, the NetEase S9 PRO model is equipped with three M8x30 screws in this area. These screws provide sufficient strength to ensure a stable connection between the base and the backrest, capable of withstanding the leaning force exerted by the human body in a seated position, preventing backrest wobbling or detachment due to loose connections.
Connection between the base and the seat frame: Commonly, M6x25 screws (6mm in diameter and 25mm in length) are used. For instance, the NetEase S9 PRO uses four M6x25 screws, and the 205/206 office chairs also use four M6*25mm screws to connect the armrests to the backrest. These screws ensure connection strength while being relatively small in size, not occupying excessive space, and facilitating easy installation and removal, making them suitable for parts like the base and seat frame that require frequent adjustments or maintenance.
Connection between the headrest and the back frame: Typically, M6x20 screws (6mm in diameter and 20mm in length) are used, although the 205/206 office chairs use two M6*30mm screws to install the headrest. The variation in screw specifications for this part among different brands and models mainly depends on the design and weight of the headrest. Longer screws provide deeper thread engagement, enhancing connection stability and ensuring the headrest does not loosen or shift during use.
Fixing the tray to the cushion: Four relatively short screws, usually of M6 or M8 specifications, are used. The 205/206 office chairs use four M6*20mm screws to install the tray. The connection between the tray and the cushion needs to ensure the cushion's stability and firmness. Short screws can meet connection requirements while avoiding interference with the cushion's internal structure due to excessive screw length.
Connection between the armrests and the seat frame: Some models use M6 series screws, with lengths varying according to the thickness of the armrests. The 205/206 office chairs use two M6*20mm screws with washers to install the upper and lower parts of the armrests. The thickness of the armrests determines the required screw length. Appropriate screw lengths ensure a tight connection between the armrests and the seat frame, while washers increase connection stability and reduce friction and wear between the screws, armrests, and seat frame.
Connection between the base and the gas lift: Typically, four screws are used, with specifications generally being M8 or M10. The connection between the base and the gas lift is a crucial part of an office chair, needing to withstand the weight of the human body and forces generated by various movements. Therefore, larger-specification screws are required to ensure connection firmness and safety.
