Scope and field of application
This standard specifies dimensions, requirements and test methods for heat-treated self-drilling tapping screws ('tapping screws', for short). These screws have a drill point with which they form a pilot hole during assembly, followed by a threaded section with which they form their mating thread, either in a forming or in a cutting operation. See the relevant DIN Standards and ISO Standards for head styles and threads of self-drilling screws.
The specifications of this standard are intended to ensure that tapping screws are capable of performing the above functions without their own thread fracturing or becoming deformed. To that end, requirements have been specified for surface hardness, drilling and thread forming capability and torsional strength.