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Pipe Threads

  American Standard British Standard
Nominal OD Threads per Inch Nominal Outside Pipe Diameter (inches) Approximate Length of Thread (inches) Approximate Total Thread Makeup (inches) NPT Straight NPS Threads per Inch Drill
Drill with Tapered Reamer Drill w/o Tapered Reamer
1/16 27 0.313     15/64 D 1/4 28 G
1/8 27 0.405 3/8 1/4 21/64 R S 28 11/32
1/4 18 0.540 5/8 3/8 27/64 7/16 29/64 19 15/32
3/8 18 0.675 5/8 3/8 9/16 37/64 19/32 19 39/64
1/2 14 0.840 3/4 7/16 11/16 23/32 47/64 14 3/4
5/8 -   -   - - - 14 53/64
3/4 14 1.050 3/4 1/2 57/64 59/64 15/16 14 31/32
7/8 -   -   - - - 14 1-7/64
1 11.5 1.315 7/8 9/16 1-1/8 1-5/32 1-3/16 11 1-7/32

 

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