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See Chinese contents: GB/T 2672-2017 GB/T 2672-2017: Hexalobular socket pan head screws
This Standard specifies the type and dimension, technical conditions, and marking of hexalobular socket pan head screws. This Standard is applicable to the hexalobualr socket pan head screws with Thread Specification M2~M10, Property Class 4.8, A2-70, A3-70, CU2 and CU3, and Product Grade A.
