Alpha HSS Tap UNC Bottoming 7/16x14 UNCHB7167 16x14 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: 7 16mm Pitch: 14mm Overall length: 70mm Shaft Diameter: 8mm Drive Square: 6. 2mm Tapping Drill Size: 9. 40mm Weight (gr) 40. 00
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