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See Chinese contents: GB/T 70.2-2015 GB/T 70.2-2015: Hexagon socket button head screws
This Part of GB/T 70 specifies the type and dimension, technical conditions and markings of hexagon socket button head screws with Thread Specification M3~M16, Property Class 08.8, 010.9, 012.9, 012.9, A2-70, A2-80, A3-70, A3-80, A4-70, A4-80, A5-70 and A5-80, Product Grade A, and the carrying capacity is reduced as per Table 3.
