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See Chinese contents: GB/T 819.1-2016 GB/T 819.1-2016: Countersunk flat head screws with cross recess -- Part 1: Property class 4.8
This Part of GB/T 819 specifies the type and dimension, technical conditions and markings of Property Class 4.8 of countersunk flat head screws with cross recess. This Part is applicable to the Type-H and Type-Z countersunk flat head screws with cross recess for Thread Specification M1.6~M10, Property Class 4.8, Product Grade A.
