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Tap Drill Charts | National Pipe Threads NPT & NPTF NPS & NPSF Pipe Tap Size Pitch (TPI) Drill Size* (inch) Pitch (TPI) Drill Size (inch) 1/16 27 0.242 (C) - - 1/8 27 0.332 (Q) 27 0.348 (S) 1/4 18 7/16 18 29/64 3/8 18 9/16 18 19/32 1/2 14 45/64 14 47/64 3/4 14 29/32 14 15/16 1 11-1/2 1-9/64 11-1/2 1-3/16 1-1/4 11-1/2 1-31/64 11-1/2 1-33/64
National Standard Taper Pipe (NPT) Threads Size Chart 1/16 0.3125 27 0.16 0.2611 1/8 0.405 27 0.18 4½ 2½ 0.26 ... Threads per inch Hand tight turns. Title: National Standard Taper Pipe (NPT) Threads Size Chart Author: Pyromation Inc Subject: NPT Threads Size Created Date:
Each thread size has a defined number of threads per inch - TPI, or pitch. The 3/4” NPT pipe thread has 14 threads per inch. Both the TPI and OD of the thread are required for positive identification of thread size because more than one size have the same TPI.
Drill sizes given are the ‘closest’ drill size.
Tap Drill Charts | ISO Metric Metric Metric Fine Ø Pitch Drill Size Pitch Drill Size. Created Date: 12/12/2018 11:37:53 AM
National Pipe Tapered Tap and Drill Sizing Chart (sized for 75% depth of thread) To Tap This Size Pipe: Use This Drill Bit: Ltr.R 7 16" 37 64" 45 64" 59 64" 1 5 32" 1 1/2" 1 47 64" 2 7 32" (Closest Fractional:) Decimal Inches:
NPT Threaded Connections According to ANSI/ASME B1.20.3 O.D. 1˚47’ angle I.D. Seal is made by the threads. The seal requires either pipe tape or pipe dope (sealing compound) to be used. The use of such provides lubrication to prevent galling of the metal and assists in sealing. 60˚ Flat truncations of root and crest
