Steel Frame Office Chair Accessories

The accessories for steel-frame office chairs mainly include four categories: basic structural components, connecting parts, functional components, and decorative parts, as detailed below:

1. Basic Structural Components

• Chair Base: Typically a five-claw star-shaped steel structure with five wheels (casters or fixed wheels) installed at the bottom, providing mobility and stability.
• Gas Lift Cylinder: The core component connecting the chair base to the seat cushion, enabling height adjustment of the seat through gas pressure regulation. It must comply with safety standards (e.g., BIFMA certification).
• Backrest Steel Tube: The steel frame supporting the chair back, connecting to the backrest and headrest brackets, requiring sufficient strength to withstand human body pressure.

2. Connecting Parts

• Screws: Including specifications such as M630, M640, and M830, used to secure components like the seat cushion, armrests, and backrest steel tube. For example, an M630 screw may be used to fix the armrest to the seat cushion, while an M8*30 screw connects the backrest steel tube to the chair base.
• Washers: 6mm and 8mm washers are used to distribute screw pressure, preventing direct metal-to-metal contact that could cause wear and enhancing connection stability.
• Headrest Bracket Connector: A specialized part connecting the headrest to the backrest steel tube, requiring compatibility with headrest angle adjustment functions.

3. Functional Components

• Seat Cushion: Typically wrapped in foam, fabric, or leather, connected to the gas lift cylinder at the bottom, providing a comfortable seating experience.
• Armrests: Fixed or adjustable, connected to the seat cushion or backrest steel tube via screws, with some models supporting height and angle adjustments.
• Headrest: An optional accessory, fixed to the top of the backrest steel tube via a bracket connector, providing neck support.

4. Decorative Parts

• Decorative Covers: Cover screws or connection points, enhancing aesthetics while preventing dust from entering the internal structure.

Supplementary Universal Accessories
Some steel-frame office chairs may borrow universal accessories from office desk steel frames, such as desk frame snap-fit connectors (for quick assembly) and steel frame insert connectors (to enhance structural stability), but these must be adapted according to the specific model. Additionally, welded accessories (e.g., metal fasteners) are rarely used in office chairs and are more common in beds or heavy-duty furniture.

Precautions
Accessory specifications must strictly match the model (e.g., screw length and washer thickness for the M56C model), as mismatches may lead to installation failures or safety hazards. For repairs, it is recommended to prioritize using original manufacturer parts to ensure compatibility and safety.