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Hexagonal bolts are also called differently, such as hexagonal bolts, hexagonal bolts, and hexagonal bolts, all of which have the same meaning. It's just that the personal name is different.
Ordinary hexagon bolts are divided into three types: A, B, and C. The first two are refined bolts. Generally speaking, ordinary hexagon bolts refer to C-level ordinary hexagon bolts. There are half teeth and full teeth. The performance grade label of the hexagonal bolt is composed of two numbers, which respectively indicate the nominal tensile strength value and the yield ratio of the hexagonal bolt material. Ordinary hexagon bolts are generally 4.8 grades. High-strength hexagonal bolts are generally 8.8, 10.9, and 10.9S. There are 12.9 grades of alloy steel hexagon bolts.
Ordinary hexagon bolts can be reused, and high-strength bolts cannot be reused (Class 10.9, 10.9S). Stainless steel screws are divided into: ordinary stainless steel outer hexagon, 304 stainless steel outer hexagon, 316 stainless steel outer hexagon, 316L stainless steel outer hexagon and so on. Standards include: National Standard (GB), German Standard (DIN), International Standard (ISO), Japanese Industrial Standard (JIS), American National Standard (ANSI/ASME), etc.
Strictly, all fasteners must be produced in accordance with standards, so they are also called standard hexagon bolts. The so-called non-standard parts are based on relatively no existing standards or are different from existing standards, but they need to be produced according to drawings.
The application range of hexagonal screws is very wide, like: electronics manufacturing, mechanical equipment industry, chemical industry, valve industry, medical equipment industry, automobile industry, aviation industry, etc.