- Specification: M3-M12

- Mechanical Property Class: 4.8-12.9

- Function: lt is widely applied to structural fastening connection of atuo interior and exterior structures. Commonly-used internal driving includes such types as cross groove, inner hexaon,inner-hexaonal plum blossm goove, inner 12 screw groove to ensure smooth assembly under complicated conditions. With proprietary intellectual property rights, efficient self-tapping screws (high strength auto triangular-tooth self-locking fasteners HY-SCPT2012TM) adopt surface hardening or partial inductive quench hardening to process counterparts to have interal threads that conform to certain required precision of threads and realize non-clearance thread coordination between workpieces so as to ensure fastening connection and anti-loosening effect in structure.