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See Chinese contents: GB/T 2673.2-2020 GB/T 2673.2-2020: Hexalobular socket high countersunk head screws
This Part of GB/T 2673 specifies the type dimensions, technical conditions and markings of hexalobular socket high countersunk head screws, as well as gauge size that controls the height of the head. This Part is applicable to hexalobular socket high countersunk head screws with the thread specification of M3 ~ M10, the performance grade of 4.8, 8.8 and 10.9, and the product grade of Grade-A.
