Although traditional in design, modern technology and metallurgical advances have improved the traditional threadbox and tap and perfected its components. Bottoming Taps are for cutting threads to the bottom of a blind hole. Use them after a regular tap has gone as far as it can in your hole.
Bottoming Taps are for cutting threads to the bottom of a blind holeSteel tap is machined to close tolerances and designed to allow easy chip clearanceThe resulting wood thread is both tight fitting and strong