Head

Standard
Rounded shape means that surface does not need to be perfectly flush.
Standard design.

Countersunk
Gives perfectly flush assembly following countersinking into the workpiece.

Stem

The BOLTOFIX™ stem has the following specific features:
- it is fluted in shape, which transmits the force applied by the riveting tool
- its head is designed to fit closely to the inside wall of the workpiece after riveting - thus forming a double body
- BOLTOFIX™ is a structural rivet. With this kind of rivet, the head of the stem participates in the mechanical resistance of the assembled system.