GB/T 22028-2008 Hot-dip galvanized screw threads-On internal screw threads there is the clearance for accommodating the hot-dip galvanized coat (English Version)
General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
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GB/T 22028-2008
Scope
This standard specifies the profile, diameter and pitch series, basic dimensions, tolerances, markings and limit dimensions of threads on internal threads to accommodate galvanized coatings. This standard applies to hot-dip galvanized threaded fasteners. There is a hot-dip galvanized layer on the surface of the external thread, and the internal thread is tapped after plating.