Common sizes include ST 3.5, ST 4.2, ST 4.8, ST 5.5, and ST 6.3.
Measured from the base of the flange to the top of the hex head. din 7504 k standard pdf
While the German DIN standard remains widely used, it has been largely superseded by the international equivalent, . Technical Specifications and Dimensions Common sizes include ST 3
The standard specifies the requirements for self-drilling tapping screws with a hexagonal head and an integrated flange (stamped washer) . Often referred to as "Tek screws," these fasteners are engineered to drill, tap, and fasten in a single operation, eliminating the need for pre-drilled pilot holes in metal substrates. Common sizes include ST 3.5