Self-tapping screws without a tip find particular application in pass-through positions, where the screw protrudes from the fixed plates and you want to avoid the risk of accidental injuries caused by the tip coming out. They are therefore of an accident prevention nature as they reduce the possibility of accidental cuts with the tip even during various maintenance operations.
The large head favors a wider sealing surface as well as the possible covering of through holes in case of sandwich coupling between two sheets, while the low profile and without edges makes them particularly suitable for "visible" applications. This screw has wide fields of application ranging from the mechanical sector to the household appliance, from the auto motive to the aluminum window frame.
The washer that seems pre-assembled adds a further aesthetic value.
The length of the screw is measured from the tip to the underhead.