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Full reference for National Pipe Thread (NPT): Drawings, Symbols, Formulas, Dimensions, Charts, Tolerances and explanations.
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.
NPT Thread Chart for basic dimensions of general purpose NPT pipe threads (inch) according to ANSI/ASME B1.20.1 standard.
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: Size Taps
Outside of North America US pipe threads are not as common as British Standard Pipe (BSP) threads. Achieving a tight, leak-free joint relies on sharply angled threads. NPT seal is accomplished via metal-to-metal wedging. To ensure a proper seal, thread sealant or tape is typically necessary.
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 .
The tap size chart provides a list of standard size taps, specifying the diameter and thread spacing, for fractional, metric, and screw sizes. The decimal equivalents of the diameters are shown in both English and Metric units.
