TEK, ZIP and Oval Self-Drilling, Self-Tapping Screws
Self-drilling screws have become a go-to for many roofing, sheet metal, wood and other industrial uses because they enable you to drill without first making a pilot hole. While self-drilling screws are often used for joining sheet metal and other materials, they have a variety of other applications based on shape, size and material.
Steel is one of the most common materials for self-drilling screws for sheet metal because it offers significant strength. The downside to pure steel is it trades corrosion resistance to secure that additional strength.
Stainless steel is best used when you need corrosion resistance because it incorporates chromium and nickel alloys. Different gradings denote different alloy compositions, so be sure to match your job with the right grade.
Self-Drilling Versus Self-Tapping
The debate over self-drilling vs. self-tapping screws is common because the terminology can be a bit confusing. Avoid such issues with this quick guide that highlights the differences between self-drilling vs. self-tapping screws.
Self-Drilling
Many people often wonder what is a self-drilling screw? Self-drilling screws, which often feature the TEK and ZIP brand names, have drill-bit points that assist the drill in biting into metal and other materials so you don’t need any pre-drilled holes. They’re typically designed to work in soft steel and metals, and will feature a number of 1 through 5. The larger the number, the thicker the material it can go through before you need a pilot hole.
