Abstract: A headless rivet is disclosed as made from steel or suitable material that provides superior compressive strength compared to conventional rivets and to that of a material to be riveted together and of a height or axial thickness equal to the sum of the materials to be riveted, the rivet having flat end surfaces and a shoulder interposed therebetween with curved neck portions extending from said shoulder to said flat ends. The curved neck portions have a predetermined radius and a predetermined depth of concavity determined according to the height of the rivet. Another embodiment discloses a rivet having ridges interposed between the shoulder and the flat ends including respective neck portions extending from said shoulder to said ridges to said flat ends.

Abstract: A self-piercing riveting system comprising a headless rivet made from steel or a suitable material that provides compressive strength superior to that of the materials to be riveted together and of a height or thickness equal to the sum of the materials to be riveted, the said rivet having flat end surfaces and its body being peripherally concaved between its ends, a die having an opening therethrough of the size and shape of the piercing end of the rivet, and a punch for driving the rivet through the materials to be fastened, the said die and punch each being provided with staking lugs for engaging the margins of the pierced opening through the said materials so as to cause the materials to flow radially against the concaved body of the rivet.