Material identification of high strength nut

Plain color, blackened, galvanized are generally common carbon steel nuts. The nuts are generally of performance grade. Stainless steel is generally A2-70. When distinguishing between carbon steel nut and stainless steel nut, we can know that stainless steel nut will not be attracted by magnet. Stainless steel products are generally bright silver.
Nut is the nut, and the bolt or screw together used to tighten the parts, all production machinery must use a component. According to the different materials, it can be divided into carbon steel, stainless steel, non-ferrous metals (such as copper) and other types. According to the attributes, there are national standard (GB), German standard (DIN), international standard (ISO), Japanese standard (JIS), American Standard (ASTM / ANSI), etc.
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