Fasteners are a type of mechanical component used to fasten and connect various machines, equipment, vehicles, ships, railways, bridges, buildings, structures, tools, instruments, and supplies. They are characterized by a wide variety of sizes and specifications, diverse performance and uses, and a high degree of standardization, serialization, and generalization. Therefore, some people refer to a class of fasteners that already have national standards as standard fasteners, or simply as standard parts. Fasteners are the most widely used mechanical components. China’s fastener products are exported in large quantities to countries around the world, and fastener products from various countries are also constantly flowing into the Chinese market. As one of the products with a relatively large import and export volume in China, the realization of international standards for fasteners is of great practical and strategic significance for promoting Chinese fastener enterprises to go global, and promoting comprehensive participation of fastener enterprises in international cooperation and competition.
Thread definition
1. A thread is a shape with a uniform helix protruding on the cross section of the outer or inner surface of a solid.
2. Thread classification
According to their structural characteristics and uses, they can be divided into three categories:
Ordinary threads: with a triangular tooth shape, used for connecting or fastening parts. Ordinary threads are divided into coarse and fine threads according to the pitch, and the connection strength of fine threads is higher.
Transmission threads: with trapezoidal, rectangular, sawtooth, and triangular tooth shapes, etc.
Sealing threads: used for sealing connections, mainly pipe threads, tapered threads, and tapered pipe threads.
For a detailed understanding of automotive standard parts, please refer to the automotive standard “Automotive Standard Parts Product Numbering Rules” (QC/T 326-2013). This concludes today’s knowledge and content sharing , tomorrow there will be more infomation about fasteners.
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Post time: Jun-28-2023
