Brubaker NPT Taps-2-11-1/2-NPTF
These general purpose taps are suitable for tapping most materials. The chips are retained in the flutes during use. Assembly of NPT threads requires a sealant such as Teflon tape or pipe joint compound. Nominal tap size is based upon the fitting size, not the actual size of the tap. A variety of surface treatments are available to improve performance.