A punch rivet for joining two workpieces, has a head and a shank. The shank is hollow with a shank internal diameter (D3), a shank external diameter (D1) and a shank end face. On the shank end face is a ring cutting edge with diameter (D4) that is smaller than the external diameter (D1) but greater than the internal diameter (D3). The ring cutting edge is radially spaced both from the shank external diameter (D1) and from the shank internal diameter (D3) by at least 20% of the radial shank wall thickness (M5). And the ratio D3/D1 of shank internal diameter D3 to shank external diameter D1 is smaller than 0.6. And the external diameter (D1) merges into an external circumference of the head by a second profile, which defines an underhead radius (R1), and the ratio of R1 to D1 (R1/D1) is smaller than 0.13.

A punch rivet for joining two workpieces, has a head and a shank. The shank is hollow with a shank internal diameter (D3), a shank external diameter (D1) and a shank end face. On the shank end face is a ring cutting edge with diameter (D4) that is smaller than the external diameter (D1) but greater than the internal diameter (D3). The ring cutting edge is radially spaced both from the shank external diameter (D1) and from the shank internal diameter (D3) by at least 20% of the radial shank wall thickness (M5). And the ratio D3/D1 of shank internal diameter D3 to shank external diameter D1 is smaller than 0.6. And the external diameter (D1) merges into an external circumference of the head by a second profile, which defines an underhead radius (R1), and the ratio of R1 to D1 (R1/D1) is smaller than 0.13.

A fastener for securing at least a first component and a second component together, the fastener comprising: a securing portion adapted to be secured to the first and/or the second component, and a guiding portion adapted to be guided by a manipulator or a tool in order to set the securing portion in the first and/or the second component, wherein the securing portion and the guiding portion form a one-piece element made of one unique aluminium alloy having a composition between 0.03 and 0.55 wt % Scandium.

A cavity (20) provided for a die body (2) at one side thereof in an axial direction includes a cavity bottom surface (21), on which a protrusion (40) jutting toward the one side in the axial direction is formed. A tip end face (41) of the protrusion (40) is configured as a flat surface extending in a direction substantially orthogonal to the axial direction and having a predetermined width (W1) in a radial direction. The predetermined width (W1) of the tip end face (41) is set to be 10% or more of a diameter (Di1) of the cavity (20) at an open end thereof.

A cavity (20) provided for a die body (2) at one side thereof in an axial direction includes a cavity bottom surface (21), on which a protrusion (40) jutting toward the one side in the axial direction is formed. A tip end face (41) of the protrusion (40) is configured as a flat surface extending in a direction substantially orthogonal to the axial direction and having a predetermined width (W1) in a radial direction. The predetermined width (W1) of the tip end face (41) is set to be 10% or more of a diameter (Di1) of the cavity (20) at an open end thereof.

Self-piercing rivet joint and self-piercing rivet for producing a joining connection between at least two components comprising a rivet head and a rivet shank having a central shank bore comprising a base, the rivet shank comprises a cylindrical shank outer surface and a shank inner surface limiting the central shank bore, the rivet shank comprises an annular piercing end facing away from the rivet head, the shank outer surface has a first diameter (Ds), the central shank bore comprises a bore depth (T) between the base of the central shank bore and the annular piercing end, wherein a ratio of the first diameter (Ds) to the bore depth (T) is in the range of 0.50Ds/T0.67.

A self-piercing rivet (SPR) joint includes a top layer including at least one steel material or at least one aluminum material, a middle layer including at least one magnesium material, and a bottom artificial aluminum layer including at least one aluminum material.

A method for joining at least two structural parts includes a fitting step in which a joining element is driven into the first structural part while a residual material thickness is maintained, and a joining step in which the joining element driven into the first structural part is connected to the second structural part. The joining element has a hollow element shaft, which is driven into the first structural part, and an element head, which is welded or adhesively bonded to the second structural part.

A fastener comprises a head end and a tail end. A shaft joins the head end and the tail end. An extension extends axially from the shaft

A fastener comprises a head end and a tail end. A shaft joins the head end and the tail end. An extension extends axially from the shaft