Precise H.S.S. Combined Tap & Drill, 5/16-18 NC – 404-266

Drill & tap in one step.
25 degree Helix provides proper cutting action for both drlling and tapping.
118 degree self-centering helical point eliminates the need for center punching or center drilling.
Reduces the thrust required. H-2 pitch diameter for 4-40 NC, all other are H-3

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