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: 8mm
- Pitch: 36mm
- Overall length: 45mm
- Shaft Diameter: 4.5mm
- Drive Square: 3.4mm
- Tapping Drill Size: 3.50mm