Hex Head Bolt Full Thread

Fastener Application
Fastener is a kind of mechanical parts used for fastening connection and widely used. In all kinds of machinery, equipment, vehicles, ships, railways, bridges, buildings, structures, tools, instruments, meters and supplies, etc., you can see a variety of fasteners. It is characterized by a wide variety of specifications, different performance uses, and standardization, serialization, generalization of the species is also high. Therefore, some people have national standards for a class of fasteners known as standard fasteners, or referred to as standard parts. Fasteners are widely used mechanical basic parts. With China's accession to the WTO in 2001 and into the ranks of international trade powers. A large number of China's fastener products are exported to all countries in the world, and fastener products from all over the world are also pouring into the Chinese market. Fasteners, as one of the products with large import and export volume in China, have important practical and strategic significance to promote Chinese fastener enterprises to the world and promote fastener enterprises to fully participate in international cooperation and competition. Due to the specifications, dimensions, tolerances, weight, performance, surface conditions, marking methods, and acceptance inspections, marking and packaging of each specific fastener product.
Common testing instruments for fasteners
The important link in the development and design of fasteners is quality control. There are several key points from feeding to finished product delivery. These key points have different inspection methods. First of all, the feed is related to appearance, size, elements, performance, harmful substance detection, etc. The process is more about appearance, size, percussion test and forging streamline. Heat treatment is more about appearance, hardness, torque, tensile force, metallography, etc. Surface treatment is more about hydrogen embrittlement test, coating, salt spray, etc., including a harmful substance detection for shipment. In terms of size and appearance detection, the common ones are secondary dimension, contour measuring instrument, three-coordinate measuring instrument and image sorting machine (this is a full selection machine). In mechanical and chemical testing, there are mainly hardness machines (Luo and Vickers), tensile machines and metallographic microscope. In material testing, there is a spectrum analyzer and salt spray testing machine.

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