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See Chinese contents: GB/T 9074.1-2018 GB/T 9074.1-2018: Bolt or screw and washer assemblies with plain washers
This Part of GB/T 9074 specifies the type size, technical conditions and marks for bolt or screw and washer assemblies with plain washers. This Part applies to bolt or screw and washer assemblies with plain washers of which the thread specifications are M2~M12, there is a flat bearing surface, the performance levels of bolt or screw are levels 8.8, 9.8 and 10.9, the hardness level of plain washer is 200 HV or 300 HV.
