Phillips Pan Head Self Driller Screws
Pan Head Screws with a Self Drilling TEK Point
Phillips pan head self drilling screws 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 #1, #2 or #3 depending on the size of the screw. These screws are used in the exterior elements.
410 Stainless Steel
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.