A Practical User's Guide to Carbide Taps
North American Tool offers carbide taps in UN and Metric sizes as well as straight and NPT/F Pipe and STI Standards. A wide range of styles and features, including straight flute, spiral flute, spiral point, and forming taps are available, as well as a full line of surface coatings such as TiN, TiCN, and TiALN for increased performance and life.
So, why carbide? Or more to the point, when carbide?
Let's consider hard or difficult materials. Where high speed steel taps have a practical top limit