Selection of standards for bolts and nuts
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Bolts and nuts: the common standards include GB5172 and GB6170 for bolts, GB901 for bolts and GB41 for nuts; there is also HG20613 for bolts and nuts. Let’s discuss under what circumstances each of these should be used!
HG is the standard for the chemical industry, while the rest are marked with *. It mainly depends on the application scenario, the properties of the fluid, temperature, pressure, and so on; specific choices should be made based on these factors