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: 3/8mm
- Pitch: 24mm
- Overall length: 63mm
- Shaft Diameter: 7mm
- Drive Square: 5.5mm
- Tapping Drill Size: 8.50mm