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See Chinese contents: GB/T 818-2016 GB/T 818-2016: Pan head screws with cross recess
This Standard specifies the type and dimension, technical conditions and markings of pan head screw with cross recess. This Standard is applicable to the Type H and Type Z pan head screws with cross recess for Thread Specification M1.6~M10, Property Class 4.8, A2-50, A2-70, CU2, CU3 and AL4, Product Grade A.
