The self-drilling screws are mainly used for screwing on metal sheets and laminates without the need for pre-drilling thanks to their tip that allows you to drill and thread in a single operation, ensuring a high reduction in assembly times and labor used. The ability to drill even important thicknesses is given by the length of the tip. In order to correctly discharge the chips, the thickness of the material to be drilled should be at least 1-1.5mm less than the size of the bit.
Compared to the cross recess, the hexagonal head guarantees the possibility of applying a higher tightening torque without the risk of the insert coming out. It is particularly suitable for diameters from 4.8 upwards.
The particular length of the tip and the thread with helical cuts make them suitable for heavy carpentry, favoring the screwing on plates and bearing structures where the thicknesses to be drilled can reach even 12mm.
The length of the screw is measured from the tip to the underhead.