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Fastener National Standard
Oct 24, 2017

Fasteners are a class of mechanical parts that are used for fastening connections and are widely used. Fasting, widely used in industries such as energy, electronics, electrical, mechanical, chemical, metallurgy, mold, hydraulic, etc., in various machinery, equipment, vehicles, ships, railways, bridges, construction, structures, tools , Chemical, instrumentation and supplies, etc., can see a wide range of fasteners, is the most widely used mechanical base pieces. It is characterized by a wide variety of specifications, performance purposes vary, and standardization, serialization, the degree of generalization 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

application

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 particular fastener product.

Commonly used detection equipment

Fastener development and design of the most important part of the quality control, from the feed to the finished product shipments have several mark, these several mark have different test methods. The first part of the feed is related to the appearance, size, elements, performance, detection of harmful substances, etc.; process is more appearance, size, percussion experiment, forging line; heat treatment is more appearance, hardness, torque, , Metallographic and so on; surface treatment is more of some hydrogen embrittlement testing, coating, salt spray, etc., including the shipment of a hazardous substance detection. In the size, appearance detection, the common is the second element, contour measuring instrument, coordinate measuring instrument, image sorting machine (this is a machine); mechanical and chemical testing, the main hardness machine (Luo and Vickers ), Rally, metallographic microscope; material detection, there is a spectral analyzer, salt spray test machine

National 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 fasteners terms in terms of standards, fastener product weight standards





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