A Press nuts (also known as a press-in nut, self-clinching nut ) ,typically is a round body rather than the hexgone body , it is with knurling and undercut on the bottom of the fastener. self-clinching nuts can be press themselves in a metal panel.
Mainly use for attach thin metal assemblies

Upon installation, Press Nut provide permanent load-bearing threads to accept mating hardware in metal sheets too thin to be tapped or where extruded or stamped threads would be impractical. They become integral parts of an assembly, will not loosen or fall out (even when the mating thread is removed)
