Difference Between Self-Tapping And Self-Drilling Screws

Self-tapping and self-drilling screws are two types of screws that are used in metal building and general construction, as well as in different industries. However, the two terms are not interchangeable.

The differences between a self-tapping screw and a self-drilling screw are:

Screws that have sharp threads and that can carve into materials are known as self-drilling screws. In contrast, self-tapping screws require an initial pilot hole before the fastening process can begin.

Self-drilling screws work as both a drill bit and a fastener. The self-drilling screws do not need a pilot hole because of the drill bit end. Self-tapping screws tap their own thread and thus they need a pilot hole that is smaller than the diameter of the screw.

Self-tapping screws are used for securing thinner sheet metals and other substrates that cut their own threads. Self-drilling screws self-drill through various gauges of metal materials without any pre-drilling.

Self-tapping screws are used to fix metal brackets into ply and timber. Self-drilling screws are used for cladding and metal roofing.