Alpha HSS Tap UNF Taper 1/2x20 UNFHT121 2x20 TAPER taps have a lead of eight threads and are used as a starting tap in difficult or high precision holes. Alpha Taper taps can be identified by the single ring on the shaft near the driving square. Diameter: 1 2mm Pitch: 20mm Overall length: 70mm Shaft Diameter: 9mm Drive Square: 7mm Tapping Drill Size: 11. 50mm Weight (gr) 45. 00
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