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See Chinese contents: GB/T 846-2017 GB/T 846-2017: Cross-recessed countersunk (flat) head tapping screws
This Standard specifies the type and dimension, technical conditions and marking of cross-recessed countersunk (flat) head tapping screws. This Standard is applicable to the cross-recessed countersunk (flat) head tapping screws with Thread Specification of ST 2.2 ~ ST 9.5, and Product Grade A.
