This standard specifies the technical requirements for surface-hardened and tempered self-extruding screws. Self-extruding screws that meet this standard can extrude a variety of common threads, and the nominal diameter of the thread is 2-12MM, which is used for mechanical and electrical products. GB/ T 3098.1 does not apply to screws manufactured to this standard.
GB/T 3098.7-2000 history
2000GB/T 3098.7-2000 Mechanical properties of fasteners-Thread rolling screws