Fasteners are also known on the market as standard parts and are mechanical components that can be mechanically secured or bonded together by two or more elements. It is characterized by a wide variety of specifications, performance uses vary, and standardization, serialization, the degree of generalization is very high. Fasteners are the most widely used mechanical base pieces and are in great demand. Fasteners can also be used to keep containers (such as bags, boxes) closed, which may be kept in close contact with the opening of the component and the lid on the container. There are also specially designed components like a bobbin that do not permanently enclose the container and the user can still open the container without destroying the fastener. Fasteners, fasteners are used for fastening and the use of a very wide range of mechanical parts, widely used in a variety of machinery, equipment, vehicles, ships, railways, bridges, construction, structure, tools, instruments, chemicals, And supplies and so on, you can see a wide range of fasteners.
Fasteners are a class of mechanical parts that are used for fastening connections and are widely used. Various types of fasteners can be seen in a variety of machinery, equipment, vehicles, ships, railways, bridges, buildings, structures, tools, instruments, meters and supplies. It is characterized by a wide variety of specifications, performance purposes vary, and standardization, serialization, generalization of the species is also very high. Therefore, some people have a national standard of a class of fasteners called standard fasteners, or simply referred to as standard parts.
Fasteners are the most widely used mechanical foundation pieces. With China's accession to the WTO in 2001 and entered the ranks of international trade power. China's fasteners a large number of products exported to countries around the world, the world's fastener products are also constantly influx of the Chinese market. Fasteners as one of China's large imports and exports of products, to achieve international standards, to promote China's fastener enterprises to the world, to promote the full participation of fastener enterprises in international cooperation and competition, have a significant practical significance and Strategic significance. Due to the specifications, size, tolerances, weight, performance, surface conditions, marking methods, and acceptance requirements for inspection, marking and packaging of each specific fastener product, it is specified in several national (industry) standards , Such as the British standard, German standard and American standard.
1, fastener product size standards: the specific provisions of the basic dimensions of the product content; threaded products, including the basic size of the thread, thread tail, shoulder distance, undercut and chamfer, the end of the external thread parts Size and other aspects of content.
2, fasteners products technical conditions of the standard. Including product tolerances, mechanical properties, surface defects, surface treatment, product testing standards and the corresponding specific aspects of the content.
3, the screw product acceptance inspection, marking and packaging standards: the specific provisions of the product factory inspection and inspection items qualified quality level and sampling programs, as well as product labeling methods and packaging requirements of the content.
4, standard parts, fasteners, screws, screws, marking the standard method: the provisions of the product complete labeling method and simplified mark method aspects.
5, other aspects of fasteners standards: such as the terms of fasteners terms, fasteners, the weight of the product standards.