Alpha HSS Tap UNC Bottoming 5/8x11 UNCHB585 8x11 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 8mm Pitch: 11mm Overall length: 80mm Shaft Diameter: 12mm Drive Square: 9mm Tapping Drill Size: 13. 50mm Weight (gr) 95. 00
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