Nuts, also known as screw nuts, are core matching fasteners of bolts. As internal thread accessories, they work with bolts to form a complete fastening assembly, undertaking the key locking and fixing function in industrial connection. Without standard matching nuts, bolt fastening will lose stability and is prone to loosening and falling off.
There are diverse types of industrial nuts with clear functional divisions. The most commonly used hex nuts are standard matching parts for hex bolts, featuring simple structure, convenient installation and strong versatility, which are the mainstream products in hardware fastening industry.
In view of anti-loosening demand in special scenarios, specialized functional nuts have been derived, including flange nuts, lock nuts, nylon insert lock nuts and thickened nuts. Nylon lock nuts are equipped with nylon rings inside, which can produce friction locking force, effectively prevent loosening caused by equipment vibration, and are widely used in automobiles, electromechanical equipment and transportation facilities. Flange nuts have a gasket integrated base, with large bearing area, which can disperse pressure, protect the installation surface and avoid structural damage.
Same as bolts, nuts have complete strength grade standards and surface treatment processes. Conventional nuts match 4.8/8.8 grade bolts, while high-strength 10.9/12.9 grade nuts are specially customized for high-load engineering scenarios to ensure consistent bearing capacity with bolts. Surface treatments such as electro-galvanizing and hot-dip galvanizing can effectively improve the rust and corrosion resistance of nuts, adapting to different indoor, outdoor and marine working environments.
The core judgment standard of high-quality nuts lies in thread precision and dimensional accuracy. Qualified nuts have neat internal threads, smooth rotation with bolts without jamming, uniform overall size, no deformation, and good bearing and compression resistance. In construction, machinery, electric power, automobile, hardware and other industries, nuts are small in size but decisive in role, which is an indispensable key part to ensure the stable operation of industrial equipment.