Alpha HSS Tap UNF Bottoming 3/8x24 UNFHB383 8x24 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: 3 8mm Pitch: 24mm Overall length: 63mm Shaft Diameter: 7mm Drive Square: 5. 5mm Tapping Drill Size: 8. 50mm Weight (gr) 40. 00
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