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See Chinese contents: GB/T 15856.5-2023 GB/T 15856.5-2023: Hexagon washer head drilling screws with tapping screw thread
This document specifies the types and dimensions, technical conditions, marks and labels, and marking of hexagon washer head drilling screws with tapping screw thread. This document is applicable to hexagon washer head drilling screws with tapping screw thread with thread specifications of ST 2.9 ~ST 6.3, made of steel, and of product grade A.
