Published on in Series Basics of Drill Bits
Coatings are used for improving the physical properties of drill bits. Black oxide Black oxide coated HSS drill bits have better corrosion resistance. They last longer than basic HSS bits and work well on a variety of materials, including metal, hardwood, softwood, PVC and fiberglass. Titanium Titanium coated HSS drill bits produce less friction and have high heat limit. They’re tougher than basic HSS bits and stay sharp longer. These drill bits can cut a broad variety of materials such as steels, irons, wood and plastic.