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See Chinese contents: GB/T 70.1-2008 GB/T 70.1-2008: Hexagon socket head cap screws
This part specifies the hexagon socket head cap screws of thread specifications for the M1.6 ~ M64, performance level of 8.8, 10.9, 12.9, A2-50, A2-70, A3-50, A3-70, A4-50, A4-70, A5-50, A5-70, CU2 and CU3, AND the product grade A.
