Sheet Metal Screws and Self Drilling Screws

Sheet Metal Screws, or Self-Tapping Screws, are thread cutting fasteners designed to be driven into untapped holes. They generally require a pre-drilled pilot hole (drill size dependent on the screw diameter and material thickness). They are available with a variety of points and thread styles in order to acomodate different material thicknesses.

Self-Drilling Screws, often called TEK Screws, are specially designed to drill, tap and - when used with a bonded neoprene washer - seal, all at the same time in one driving operation. They are similar to Self-Tapping Sheet Metal Screws but have a drill-shaped point designed to cut through the substrate, eliminating the need to drill a pilot hole.