Guhring - M16x1.50 Metric Fine 6HX D10/D11 Thread Limit Bottoming Thread Forming Tap - Solid Carbide, TiAlN Finish, 100mm OAL, Series 1581

Bottoming chamfers are used for threading blind holes to the bottom. They have 1 to 2 threads.

Titanium aluminum nitride (TiAlN) has a higher hardness than TiN and TiCN. It is extremely-heat resistant and commonly used for high-speed applications on stainless steels, nickel and titanium alloys.

Solid carbide provides better rigidity than high speed steel. It is extremely heat resistant and used for high speed applications on cast iron, nonferrous materials, plastics and other tough-to-machine materials.