self-clinching studs, also known as pressure riveting screws or pressure riveting bolts, 

is a fastener used in sheet metal or sheet metal turning out of the lathe.

In use process need to cut a small opening on the substrate, the pressure riveting screw 

into the hole, the riveting pressure equipment parallel uniform platen of the head, because

of the pressure riveting screw under the head of toothed embossed, when pressed into the 

matrix deformation around the pressure riveting screws, and indented occlusion occurs, thus 

forming a strong external thread.