R4 screw with countersinking cutters creates its own
countersink hole and can be used for any material without
The screw has 6 cutting pockets which also work as
supporting edges for the head. When using the screw
the cutting pockets create the countersinking and cut
into the material. At the same time the supporting edges
have a stabilizing effect. When fastening fittings,
these supporting edges rest on the pre-formed countersunk
holes and avoid material damage.
The six self countersinking cutting pockets act
like a circular saw blade.
They transport the "drill-dust" away
from the edge of the screw hole.
They also widen the countersink hole only around
the head shape.
The screw head top closes the hole exactly leaving
no damaged fibers around the head.
The countersink cutting screw can be used in all woodworking
and plastic applications and because the head is 90
degrees angle at the underside, the screw fits perfectly
into the pre-countersunk holes of hardware fittings
such as hinges or locks. Stocking of different screws
is no longer necessary. It makes the R4 a very versatile
The countersinking gets even better the harder the
material. No build up occurs around the countersinking
area as the ribs push abraded material away from below
the screw head and the material can be compacted tightly
together into the space between the cutting-edges.