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Tap Drill Sizes

The Tap Drill Sizes Reference Guide included in the Web Machinist program (below) provides the Tap Drill Sizes for Standard Inch Cutting Taps #0-80 to 2.5-4, Inch Roll Forming Taps #0-80 to 3/4-16, Metric Cutting Taps M1 x .25 to M68 x 6, Metric Roll Forming Taps M1.6 x .35 to M10 x 1.5, Straight Pipe Taps 1/16 x 27 to 6.0 x 8, Tapered Pipe Taps 1/16 x 27 to 6.0 x 8.

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