Office Chair Screw Set

The office chair screw set includes various types of screws, each with unique structural and functional characteristics suitable for different installation scenarios.

1. 12.9-grade Black Hexagon Socket Set Screw M3 High-Strength Fastener
   This type of screw is made of 12.9-grade high-strength steel with a black surface treatment for corrosion resistance. The hexagon socket design requires a hexagon socket wrench for installation. The set screw structure (headless) can be embedded inside components for concealed fixation. The M3 size is suitable for small-scale connections, such as the initial fixation of office chair armrests to the chair body or the fastening of internal structural parts. Its high strength allows it to withstand significant loads, preventing loosening after long-term use.

2. M8*20 Black Zinc 8.8-grade Screw with Anti-Slip Teeth, Internal and External Hexagon
   The screw has a specification of M8 (8mm diameter) * 20 (20mm length), with a moderate 8.8-grade strength. The black zinc coating enhances rust resistance. The internal and external hexagon design offers flexibility: the external hexagon can be operated with a regular wrench, while the internal hexagon can be used with a hexagon socket wrench to increase torque. The anti-slip teeth structure enhances friction with the connected parts, preventing rotational loosening. It is commonly used for connecting the office chair base to the gas lift or fixing the chair legs to the chair body, ensuring structural stability.

3. Five-Star Rubber-Capped Screw M8 Torx-Head Bolt with Rubber Coating
   This type of screw has a five-pointed star-shaped head covered with a rubber layer, providing both anti-slip and aesthetic functions. The M8 size is suitable for larger-scale connections, such as the adjustment mechanisms of office chair headrests or the height adjustment of armrests. The rubber layer reduces direct metal contact, minimizing noise and providing a comfortable feel. The five-pointed design requires a specialized tool for operation, preventing non-professional disassembly and is suitable for scenarios that require frequent adjustment but need to prevent accidental operations.

4. L-Shaped Adapter Nut (90° or 98°)
   The L-shaped adapter nut is used for vertical connections, with angles of 90° or 98° (to accommodate different design requirements). Its function is to fix two vertical components (such as the chair back and the chair body) with screws, forming a stable right-angle structure. The material is usually steel or alloy, with a zinc or nickel coating for rust prevention. It is commonly used in the frame connections of office chairs, ensuring the perpendicularity of the chair back and the seat surface and enhancing overall load-bearing capacity.

5. Universal Accessory Screw Set
   This includes tray screws, armrest screws, headrest screws, etc., covering various sizes (such as M4, M6, M8) and lengths to meet the installation requirements of different components. For example, tray screws are used to connect the chair seat to the gas lift, armrest screws fix the armrests to the chair body, and headrest screws adjust the height of the headrest. These screws usually feature a standard hexagon or cross-recess design for easy installation and replacement. The materials are mostly carbon steel or stainless steel, balancing strength and cost.

The selection of an office chair screw set should be based on a comprehensive consideration of component materials, load-bearing requirements, and installation scenarios to ensure structural safety and user comfort.