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See Chinese contents: GB/T 9074.18-2017 GB/T 9074.18-2017: Tapping screw and washer assemblies with plain washers
This Part of GB/T 9074 specifies type and dimension, technical conditions and marking of tapping screw and washer assemblies with plain washers. This Part is Applicable to the tapping screw and washer assemblies with plain washers for Thread Specification ST 2.2 ~ ST 9.5, flat supporting surface, and the mechanical properties conforming to GB/T 3098.5.
