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Find the recommended tap size and drilled pilot hole for taper pipe threads according to ANSI standard. Compare NPT and NPS sizes and see the conversion calculator for other units.
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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).
Feb 1, 2021 · This formula works for both metric and imperial units, and for all 60-degree threads (all ISO, DIN, UTS, UNC, UNS, and UNF bolts). The first tap drill chart below is in mm and the next in inches. Both are available as a printable tap drill chart PDF as well.
Pipe Thread Drilled Hole Sizes. Drill sizes given are the ‘closest’ drill size.
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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:
Thread milling requires the same predrill diameter as tapping. Easily find the diameter of drill your thread form and size require. Tap drill charts include UN, Metric (ISO), NPT, BSP and much more.
