BOTTOMING taps have a lead of two threads and are used when tapping blind holes. Usually preceded by a taper or intermediate tap. Alpha bottoming taps can be identified by their plain shaft, they have no rings on the shaft near the driving square.
Diameter: 16mm
Pitch: 2mm
Overall length: 80mm
Shaft Diameter: 12mm
Drive Square: 9mm
Tapping Drill Size: 14.00mm