What are the national standard sizes of hexagon socket head screws?

The size of the socket head cap screws ranges from M4 to M 100, and the length ranges from 10mm to1000 mm. Theoretically, there are infinite specifications of socket head cap screws, but the actual specifications are always tens of thousands. In order to find the answer, you need to know exactly the type and specification of hexagon socket head bolts you need.

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