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See Chinese contents: GB/T 70.4-2015 GB/T 70.4-2015: Hexagon socket button head screws with collar
This Part of GB/T 70 specifies the type and dimension, technical conditions and markings of hexagon socket button head screws with collar for Thread Specification M3~M16, Property Class 08.8, 010.9, Product Grade A, and the carrying capacity is reduced as per Table 3.
