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See Chinese contents: GB/T 16824.1-2023 GB/T 16824.1-2023: Hexagon washer head tapping screws
This document specifies the type and dimensions, technical conditions, marks and labels, and marking of hexagon washer head tapping screws. This document is applicable to hexagon washer head tapping screws with thread specifications of ST 2.2~ST 8, made of steel and stainless steel, and of grade A.
