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See Chinese contents: GB/T 2670.2-2017 GB/T 2670.2-2017: Hexalobular socket countersunk head tapping screws
This Part of GB/T 2670 specifies the type and dimension, technical conditions, and marking of hexalobular socket countersunk head tapping screws. This Part is applicable to the hexalobular socket countersunk head tapping screws with Thread Specification of ST 2.9 ~ ST 6.3, Product Grade A.
