Stainless Steel Phillips Pancake Head Self Drilling Screws
410 Stainless Steel Low Profile Drill Point Self Tapping Screws
Phillips pancake head self drilling screws are made of 410 stainless steel and have a sheet metal thread with a self driller cutting (TEK) point to pierce through 20 to 14 gauge metals. The higher the TEK number the larger the drill point to pierce heavier gauge metals. The heads use a Phillips driver #2. These screws are used in the exterior elements as the 410 stainless steel is corrosion resistant.
Harder than 18-8 stainless but with less corrosion resistance, 410 stainless is commonly used to make roofing screws, siding screws and self tapping (or self drilling) screws, because it is a harder material than the metal being fastened in these types of applications.