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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 .
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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Refer to this table to determine the tap drill sizes for National Pipe Threads (both NPT - National Pipe Taper & NPS - National Pipe Straight).
This tap and clearance drill chart shows tap and clearance drill sizes for standard threads. There is also a printable version that has both metric and inch threads.
Screw SizeMajor DiameterThreads Per InchTap Drill ...(75% Thread For Aluminum, Brass, & Plastics)11.0002061/6411.0001215/1611.00087/815/16.93752057/64Pipe Thread Drilled Hole Sizes. Drill sizes given are the ‘closest’ drill size.
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4-1/4 Drill Bit. Only Sold Individually. Our most popular NPT Tap Sets: 5 Piece Carbon Steel NPT Pipe Tap Set, 1/8", 1/4", 3/8", 1/2" and 3/4" in Plastic Pouch Case. 6 Piece Carbon Steel NPT Pipe Tap Set, 1/8", 1/4", 3/8", 1/2", 3/4" and 1" in Wooden Case.