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Reference >>Pipe Tap Drill Chart

Pipe Tap Drill Chart

April 5, 2012, 11:13 pm

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Eldar Gerfanov (Admin)

April 5, 2012, 11:13 pm

November 26, 2021, 12:17 am

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by Eldar Gerfanov (Admin)

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Wed April 2, 2025, 8:05 pm

Wed April 2, 2025, 8:05 pm
icon_tap_p.png

- American Standard British Standard
Size Threads
per inch		 NPT NPS Threads
per inch		 Drill size
1/16 27 D 1/4 28 G
1/8 27 R S 28 11/32
1/4 18 7/16 29/64 19 15/32
3/8 18 37/64 19/32 19 39/64
1/2 14 23/32 47/64 14 3/4
5/8 - - - 14 53/64
3/4 14 59/64 15/16 14 31/32
7/8 - - - 14 1-7/64
1 11.5 1-5/32 1-3/16 11 1-7/32

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