Non-standard parts specification
Release time：
2023-08-04
Fasteners are the most widely used basic mechanical parts. With my country's accession to the WTO in 2001, it has entered the ranks of international trade powers. A large number of fastener products of non-standard parts manufacturers in my country are exported to countries all over the world, and fastener products from all over the world are also pouring into the Chinese market. As one of the products with a large import and export volume in my country, fasteners are in line with international standards, which is of great significance and significance for promoting Chinese fastener companies to go global and promoting fastener companies to fully participate in international cooperation and competition. strategic significance. Fasteners are a general term for a class of mechanical parts used to fasten two or more parts (or components) into a whole. Also known as standard parts in the market.
Non-standard parts are norms, and each country and department has its own standards. At present, the most commonly used standards in our usual business are as follows: GB-Chinese National Standard (National Standard) ANSI-American National Standard (American Standard) DIN-German National Standard (German Standard) ASME-American Society of Mechanical Engineers Standard JIS-Japanese National Standard (Japanese Standard) BSW-British National Standard GB-National Standard is one of many standards in my country, and there are also industry standards, professional standards and departmental standards. National standards are divided into: GB (mandatory standard), GB/T (recommended standard) and GBn (national internal standard). We usually see such as GB30, GB5783, etc. are mandatory non-standard parts manufacturers. In addition to the differences in some basic dimensions of the above non-standard parts manufacturers’ standards, such as the difference between the head’s opposite side and the head’s thickness, the most important thing is the difference in the threaded part. The threads of GB, DIN, JIS, etc. are all in MM (millimeters), collectively referred to as metric threads. Threads like ANSI, ASME, etc. are in inches and are called American standard threads. In addition to metric threads and American threads, there is also a BSW-British standard, whose threads are also in inches, commonly known as Whitworth threads. The metric thread of non-standard parts manufacturers is in MM (mm), and its cusp angle is 60 degrees. Both American and British threads of non-standard parts manufacturers are in inches. American threads also have a cusp angle of 60 degrees, while British threads have a cusp angle of 55 degrees. Due to the different units of measurement, the representation methods of various threads are also different. For example, M16-2X60 represents a metric thread. His specific meaning means that the nominal diameter of the screw is 16MM, the tooth pitch is 2MM, and the length is 60MM. Another example: 1/4-20X3/4 means the inch thread, and his specific meaning is the nominal diameter of the screw. It is 1/4 inch (one inch=25.4MM), there are 20 teeth on one inch, and the length is 3/4 inch. Manufacturers of non-standard parts usually add UNC and UNF after the British screws if they want to indicate American screws, so as to distinguish whether they are American-made coarse threads or American-made fine threads. In the usual domestic sales business, the standards we most often encounter are GB (National Standard) and DIN (German Standard).
In terms of non-standard products, there are mainly the following standards: GB30; GB5783; GB5782; GB52; GB6170; GB818; GB819; GB845; GB846; GB70; DIN912; DIN933; At present, GB30 (old national standard) has been replaced by GB5783 (new national standard) in the standard book. GB52 (old national standard) has been replaced by GB6170 (new national standard) in the standard book. In 1986, our country formulated new standards for standard parts of non-standard parts manufacturers, which are generally called new standards in business, and the most used ones are mainly GB5780, GB5781, GB5782, GB5783, and GB5784. GB5780 is a hexagonal head thick shank half-thread screw, and its precision grade is a C-grade product, which can be replaced by GB5782 (GB5782 is a hexagonal head thick shank full-thread screw, and its accuracy is grade A and B.) GB5781 is a hexagonal head full-thread screw. Tooth screw, precision grade is C grade product. It can be replaced by GB5783 (GB5783 is a hexagonal head full-thread screw, and its precision grade is grade A and grade B). GB5784 is a hexagonal screw with a thin rod and half thread. 2. Product knowledge of fasteners Fasteners are a type of mechanical parts used for fastening connections and are widely used. The characteristics of fasteners from non-standard parts manufacturers: there are many varieties and specifications, different performances and uses, and standardized, series The degree of generalization and generalization is extremely high. Therefore, some people also refer to a class of fasteners with existing national (industry) standards as standard fasteners, or standard parts for short. Due to the specifications, dimensions, tolerances, weight, performance, surface conditions, marking methods, and specific requirements for acceptance inspection, marking, and packaging of each specific fastener product, they are stipulated in several national (industry) standards. , such as Imperial, German and American.
Fasteners are the most widely used basic mechanical parts. With my country's accession to the WTO in 2001, it has entered the ranks of international trade powers. A large number of fastener products of non-standard parts manufacturers in my country are exported to countries all over the world, and fastener products from all over the world are also pouring into the Chinese market. As one of the products with a large import and export volume in my country, fasteners are in line with international standards, which is of great significance and significance for promoting Chinese fastener companies to go global and promoting fastener companies to fully participate in international cooperation and competition. strategic significance. Fasteners are a general term for a class of mechanical parts used to fasten two or more parts (or components) into a whole. Also known as standard parts in the market.
