Self-drilling screw is a screw that can tap its own hole as it is driven into the material. For hard substrates such as metal or hard plastics, the self-drilling ability is often created by cutting a gap in the continuity of the thread on the screw, generating a flute and cutting edge similar to those on a tap. Thus, whereas a regular machine screw cannot tap its own hole in a metal substrate, a self-drilling one can (within reasonable limits of substrate hardness and depth).
Self-drilling screws, also known as TEK® screws, are available in a wide variety of head styles and finishes to fit the demands of nearly any application. These screws are usually used to join materials like sheet metal.
Advantages:
◈Teks Drill Point
Non walking, cutting edges, pigtail reduction
Engages material faster, drills with less effort, safer installation

◈Load bearing area
Selectively hardened to retain strength and ductility performance similar to a Grade 5 bolt
Resists shear failure due to loading and different expansion coefficients in dissimilar metals

◈Installs faster
Drills and taps faster with fewer stalls
Reduces installation time and money

◈Climaseal ACR
Coating provides long life protection
Fewer replacements