Punch rivet and die

A punch rivet with a rivet head and a rivet shank with a central shank hole that have a common central axis X, wherein

• the rivet head has an essentially cylindrical head outer face of a specified head diameter dK,
• the rivet shank has an essentially cylindrical shank outer face of a specified shank outer diameter dN and an essentially cylindrical shank inner face of a specified shank inner diameter di delimiting the central shank hole,
• the head outer face and the shank outer face are connected by means of a conical or slightly curved underhead chamfer and an underhead radius R4, which radius merges tangentially both into the underhead chamfer and into the shank outer face, and
• the shank outer face and the shank inner face are connected at the rivet foot end via a radially outer first radius R1 and a radially inner second radius R2 that merge into one another tangentially, wherein the common tangent Tan encloses an angle α with a radial plane of the punch rivet,
• wherein the first radius R1 merges tangentially into the shank outer face or is replaced by a chamfer of corresponding length, and the second radius R2 is connected to the shank inner face via a third radius R3, which radius merges tangentially both into the second radius R2 and into the shank inner face, and
• wherein the following value ranges hold true for the first radius R1, the second radius R2, the third radius R3, and the angle α:
• R1=0.3±0.2 mm
• R2=(0.7 to 1.2)(dN−di)/2
• R3=0.8±0.4 mm
• α=5°±10°.