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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 .
NPT - Briggs Standard Pipe threads - Taps and Drill Sizes. 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:
UNIFIED NATIONAL FORM (60o) * Taper pipe threads of improved quality are obtained when the tapping hole is pre-formed using Sutton Taper Pipe Reamers.
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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).
Drill This Hole Size. Imperial has made a concerted effort to provide accurate information in its catalog and on its web site, however Imperial assumes no responsibility for the accuracy of the information.
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Tap/Drill Size Chart - Unified & Metric. UNIFIED. TAP SIZE. DRILL SIZE. 0-80. 3/64 (.0469) 1-64. 53 (.0595)