Alpha HSS Tap UNC Intermediate 1/4x20 UNCHI141 4x20 INTERMEDIATE taps have a lead of four threads and are used in most general purpose applications. Alpha Intermediate taps can be identified by the two rings 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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