Introduce the standard of American bolts in detail

Although the American bolt standard is not a general standard in our country, it is also very important to many people in the industry. In order to help everyone understand the American bolt standard in more detail, China Standard Parts Network summarizes the detailed explanation of the American bolt standard according to relevant materials for reference.

　　American bolt standards are divided into many categories in the standard system, including American standard ANSI, American military standard MIL, American machine standard ASME, etc., and some directly adopt international standard ISO.

　　 There are two major sizes of American bolts, one is the metric system and the other is the imperial system. For countries that adopt the metric system, the nominal size of metric bolts is the same. For example, the commonly used metric bolts are: M4, M5, M6, M8, M10, M12, M16, etc.

　　 my country is a country that adopts the metric system. Therefore, the size of metric bolts in the United States can be directly compared to the national standard (or ISO standard), but pay attention to the differences in certain specific structural details, materials and mechanical properties.

　　The difference between the American-made bolt standard and the national standard is that they have different opposite sides and thickness. The other 1/2 specifications have different tooth diameters. The American-made bolts have 13 threads and the British-made bolts have 12 threads. (Guide: Introduction to the causes of brittle fracture of high-strength bolts)

　　 The most commonly used standards in our daily 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 Standards are many in our country One of the standards, in addition to industry standards, professional standards and departmental standards.

　　The national standards are divided into GB (mandatory standards), GB/T (recommended standards) and GBn (national internal standards). What we usually see like GB30, GB5783, etc. are all mandatory standards.

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