Alpha HSS Tap UNC Taper 1/4x20 UNCHT141 4x20 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 4mm Pitch: 20mm Overall length: 50mm Shaft Diameter: 6mm Drive Square: 4. 9mm Tapping Drill Size: 5. 20mm Weight (gr) 15. 00
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