This part of GB/T 3098 specifies the materials, technical requirements and test methods for self-tapping screws. This part applies to self-tapping screws made of carburized steel, with thread specifications ST 2.2~ST 9.5, and threads conforming to the provisions of GB/T 5280.
GB/T 3098.5-2016 Referenced Document
GB/T 3098.13-1996 Mechanical properties of fasteners--Torsional test and minimum torques for bolts and screws with nominal diameters 1mm to 10mm