These rivets achieve with a single element a stable, secure and permanent type of union between panels or parts to be joined of various materials and thicknesses. They consist of a pin and a shank with expanding teeth and a convex head. The pressure exerted on the pin inserted into the shank expands, through mutual interference, the shank previously press-fitted into the hole exerting compression against the parts to be joined by securing them securely and stably. They are available in different versions and sizes, also pre-planted for faster application.