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DDX HSS Spiral Point Tap, UNC, ANSI Standard
DDX taps feature a special O.D. and P.D. relief and increased back taper for use in through hole applications where a free cutting action is desirable. No.4 - 3/8" are 'necked' for deep hole applications. Steam oxide reduces wear and prevents chip welding when through hole tapping in abrasive or harder ferrous materials.
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