Rivet for use in conjunction with high-strength steel has rivet head with rounded lower surface having small and large radii

摘要

A half-hollow punch rivet (4) has a head (6) with a rounded lower face (7) transition to a shaft (8). The rounded lower face has a first small radius (R1) that makes a transition to a second larger radius (R2) towards the rivet head (6). The second radius is three to ten times larger than the first.