Office Chair Lifting Nut

Office chair lifting nuts vary in function and working principle depending on their type, mainly divided into two types: the large nut for pneumatic lifting chairs and the lead screw nut in functional chairs.

The Large Nut for Pneumatic Lifting Chairs

• Function: It serves as a crucial fastener connecting the pneumatic rod to the base or seat, utilizing the frictional force between threads to achieve self-locking and firmly securing the pneumatic rod between the load-bearing structures of the chair. Its tightening state directly affects the smoothness of chair lifting, the stability of the overall structure, and the safety of long-term use.
• Installation Method: The standard sequence is to first install the casters into the five-star base, then vertically place the pneumatic rod (with the thick end facing down) into the center hole of the five-star base for preliminary fixation. Next, attach the base to the seat using screws. Finally, align the seat (along with the base) vertically with the upper end of the pneumatic rod and insert it, and then use the large nut from the bottom of the chair for final tightening. When tightening, use an appropriate wrench and apply even force in a clockwise direction until the nut feels fully locked.
• Daily Inspection and Maintenance: Regularly check if the large nut is loose. During the inspection, use your hand or a tool to gently try to rotate the nut in the reverse (counterclockwise) direction. If it can be rotated, it means it has become loose, and you should immediately tighten it again in a clockwise direction. Conducting this inspection regularly (e.g., once every quarter) can effectively prevent structural instability caused by looseness.
• Adjustment Method: Adjusting the chair height is usually achieved by operating the lifting lever or knob on the side of the seat, rather than by turning the large nut at the bottom.

The Lead Screw Nut in Functional Chairs

• Function: Through a unique helical line matching design, it converts rotational motion into linear motion, enabling fine adjustments of the chair in multiple dimensions. In terms of height adjustment, the rotation of the lead screw drives the nut up and down, achieving flexible adjustment of the chair height. For tilt angle adjustment, by adjusting the precise position of the nut on the lead screw, the tilt of the chair back can be flexibly adjusted.
• Features: During the design and manufacturing process, stability and durability are fully considered. High-quality materials and precision manufacturing processes are used to ensure stable performance during frequent use, guaranteeing the long-lasting and reliable adjustment function of the functional chair.