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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 .
Tap Drill Charts | National Pipe ... 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. ...
The NPT - National Pipe Taper Threads - is based on the Briggs Standard Pipe Thread. Drill sizes for Briggs Standard Pipe taps for direct tapping without reaming are indicated below:
An NPT Tap Drill Chart is a handy reference tool that tells you exactly what size drill bit to use when preparing a hole for NPT (National Pipe Thread) tapping. It's like a recipe book for creating perfect pipe threads every time.
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.
National Pipe Threads Tap Drill Chart. NPT and NPS threads share similarities in thread angle, shape and pitch (TPI – threads per inch). However, they differ in their design: NPT threads are tapered, while NPS threads are straight (parallel). Both types feature a 60° included angle.
Find the complete standard NPT tap drill sizes chart, including decimal equivalents for accurate conversions. Easily reference tap drill sizes from 1/16 to 3 inches for precise machining and threading applications.