Alpha HSS Tap UNF Bottoming 1/2x20 UNFHB121 2x20 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: 1 2mm Pitch: 20mm Overall length: 70mm Shaft Diameter: 9mm Drive Square: 7mm Tapping Drill Size: 11. 50mm Weight (gr) 50. 00
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