Alpha HSS Tap MC Bottoming-12x1.75 MCHB120BOTTOMING 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: 12mm Pitch: 1. 75mm Overall length: 75mm Shaft Diameter: 9mm Drive Square: 7mm Tapping Drill Size: 10. 20mm Weight (gr) 45. 00
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