Alpha HSS Tap UNC Taper 1x8 UNCHT11x8 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: 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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