Alpha HSS Tap UNC Bottoming-1x8 UNCHB1BOTTOMING 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: 1mm Pitch: 8mm Overall length: 110mm Shaft Diameter: 18mm Drive Square: 14. 5mm Tapping Drill Size: 22. 25mm Weight (gr) 260. 00
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