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  1. Machinist Metric ISO Screw Thread Tap - Drill Size Chart. The following is a ANSI Standard Pipe Thread Recommended Tap size and Drilled Pilot Hole for Taper. National Pipe Thread Taper ( NPT ) is a U.S. standard for tapered threads used on threaded pipes and fittings .

  2. Pipe Thread Drilled Hole Sizes. Drill sizes given are the ‘closest’ drill size.

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  3. Refer to this table to determine the tap drill sizes for National Pipe Threads (both NPT - National Pipe Taper & NPS - National Pipe Straight).

  4. Feb 1, 2021 · A rule of thumb is that the right tap drill is around 85% for coarse threads and 90% for fine threads which feature a higher number of threads per axial distance. In our case, the correct tap drill would be the closest to 3.4 mm from below, and that is the 3.3 mm or 0.13-inch tap drill.

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  6. Apr 15, 2021 · Selection Criteria and Wizards. Size Chart For Cutting Threads. April 15, 2021 by Charles Kolstad. Figure 1: Tap and die set. A tap drill chart determines what size hole to drill before tapping female threads and what size pipe is needed for male threads.

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  8. Drill sizes for Briggs Standard Pipe taps for direct tapping without reaming are indicated below: TPI = threads per inch. 1 inch = 25.4 mm. Withworth Threads - ISO 7 and ISO 228 - Taps and Drill Sizes. Related Topics. Dimensions of Pipes and Tubes. Pipe, tube and fittings sizes and dimensions. Inside and outside diameters, weights and more.

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