Alpha HSS Tap UNF Bottoming 9/16x18 UNFHB9169 16x18 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: 9 16mm Pitch: 18mm Overall length: 70mm Shaft Diameter: 11mm Drive Square: 9mm Tapping Drill Size: 12. 90mm Weight (gr) 70. 00
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