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Self-tapping screws are mainly used for screwing onto metal sheets and laminates through simple drilling, without threading or tapping operations. These screws are not particularly suitable for use on die-cast materials and plastics. For safe and stable screwing, particular attention must be paid to the diameter of the hole to be drilled. A small hole in which the screw "forces" to enter is certainly not synonymous with greater guarantee in fixing. Please note, among other things, that the existing tables are empirical and only give an indication of drilling, but are not a certain rule, as the fixing must be verified from time to time according to the technical-mechanical conditions of the part that will be made. squeeze.

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 length of the screw should be measured from the tip to the underhead.