Standard setting, process upgrading: Round welding nuts embark on a new stage of high-quality development.

In the precise connection system of automotive manufacturing and heavy machinery, there is a type of nut that can be permanently fixed through welding without requiring any space for a wrench - the round welding nut. With its unique advantages of compact structure and high connection strength, it has become a core component in the welding assembly process. With the upcoming implementation of new industry standards in the automotive sector, this specialized field is entering a new stage of standardized and high-quality development. 
What is a round welding nut? "Welding" means "permanent fixation"
A round welding nut is a type of fastener with a circular or circular flange shape, which is fixed to a metal sheet through welding. Unlike traditional nuts that require a wrench to tighten, the round welding nut achieves a secure and permanent connection by fusing the nut and the base material through resistance welding or arc welding. 
"The core value of this technology lies in 'welding as fixation' - there is no need to reserve space for a wrench, and after welding, the bolts can be directly inserted to complete the assembly," an industry technician explained. "This connection method not only significantly improves the assembly efficiency, but its circular design also enables it to adapt to installation scenarios with limited space. It is particularly widely used in thin plate connection parts such as car bodies and chassis." 
New standards have been released, accelerating the process of industry standardization.
In December 2025, the Ministry of Industry and Information Technology officially issued the automotive industry standard QC/T 1254-2025 "Automotive B-Type Welded Round Nut". It will come into effect on July 1, 2026. This standard stipulates the type and size, technical conditions, and product number of automotive B-type welded round nuts with thread specifications ranging from M5 to M12, mechanical performance grades of 8 and 10, and product grades of A. 
Before this, the industry mainly referred to the QC/T 867-2011 "Welding Round Nuts" standard, which was applicable to automotive welding round nuts with thread specifications ranging from M4 to M12 and performance level 8. The introduction of the new standard has included level 10 high-performance products in the regulations, imposing stricter requirements on technical conditions, marking the development of round welding nuts towards higher strength and greater standardization. 
The product features are outstanding, meeting diverse connection requirements.
The round welding nuts have distinctive characteristics in the product design. Their circular shape makes them particularly suitable for installation scenarios where space is limited and wrenches cannot be used; after being connected through welding, the nuts form a permanent bond with the substrate, and their anti-loosening performance is superior to that of traditional threaded connections. 
The common round welding nuts available in the market currently have thread specifications ranging from M5 to M12, and mechanical performance grades covering 8 and 10. The surface treatment options include natural color or galvanization. Custom processing can also be provided according to customer requirements. In automotive manufacturing, these nuts are widely used in key areas such as body panel connection and chassis component fixation. 
The application scope of the layout is continuously expanding, and the automotive industry is the main battlefield.
The application of round welding nuts is centered around automotive manufacturing and radiates to multiple fields. In the automotive industry, it is widely used in thin plate welding connection parts such as body panels, chassis structural components, and seat frames. In addition, in the fields of home appliance manufacturing, construction machinery, and rail transportation equipment, round welding nuts have also gained increasingly widespread application due to their reliable welding fixation. 
The market has broad prospects, and the industry is moving towards high performance.
Data from market research institutions shows that with the rapid development of the automotive industry, especially in the field of new energy vehicles, the demand for high-strength and highly reliable fastening and connecting components continues to increase. The round welding nuts, as key components of the welding assembly process, have seen a steadily expanding market size. 
Looking to the future, the round welding nut industry is evolving towards higher performance, standardization, and greenification. On one hand, the implementation of new standards will promote the widespread application of high-strength products such as grade 8 and grade 10; on the other hand, with the increase in the demand for automotive lightweighting, higher requirements have been put forward for the material performance and welding process compatibility of welding nuts. At the same time, the integration of automated welding production lines and intelligent manufacturing systems will bring about a dual improvement in efficiency and quality for the production and manufacturing of round welding nuts. 
This tiny nut, which is "permanently fixed" through welding, is playing an increasingly important role in the precise connection system of automotive manufacturing and high-end equipment.