Alpha HSS Tap UNC Bottoming 5/16x18 UNCHB5165 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: 5 16mm Pitch: 18mm Overall length: 53mm Shaft Diameter: 6mm Drive Square: 4. 9mm Tapping Drill Size: 6. 60mm Weight (gr) 25. 00
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