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Tap Drill Size For Pipe Threads


Nominal Tap Size Drill Size
1/16-27 NPT(F)  w/o Reamer C
1/16-27 NPT(F)  w/Reamer A
1/16-27 NPSC 1/4
1/16-27 NPSF D
1/8-27 NPT(F)  w/o Reamer Q
1/8-27 NPT(F)  w/Reamer 21/64
1/8-27 NPSM T
1/8-27 NPSC 11/32
1/8-27 NPSF R
1/4-18 NPT(F)  w/o Reamer 7/16
1/4-18 NPT(F)  w/Reamer 27/64
1/4-18 NPSM 15/32
1/4-18 NPSC 7/16
1/4-18 NPSF 7/16
3/8-18 NPT(F)  w/o Reamer 9/16
3/8-18 NPT(F)  w/Reamer 9/16
3/8-18 NPSM .603
3/8-18 NPSC 37/64
3/8-18 NPSF 37/64
1/2-14 NPT(F)  w/o Reamer 45/64
1/2-14 NPT(F)  w/Reamer 11/16
1/2-14 NPSM 19mm
1/2-14 NPSC 23/32
1/2-14 NPSF 45/64
3/4-14 NPT(F)  w/o Reamer 29/32
3/4-14 NPT(F)  w/Reamer 57/64
3/4-14 NPSM 61/64
3/4-14 NPSC 59/64
3/4-14 NPSF 59/64
1 - 11-1/2 NPT(F)  w/o Reamer 1-9/64
1 - 11-1/2 NPT(F)  w/Reamer 1-1/8
1 - 11-1/2 NPSM 1-13/64
1 - 11-1/2 NPSC 1-5/32
1 - 11-1/2 NPSF 1-5/32
1-1/4 - 11-1/2 NPT(F)  w/o Reamer 1-32/64
1-1/4 - 11-1/2 (F)  w/Reamer 1-15/32
1-1/4 - 11-1/2 NPSM 1-35/64
1-1/4 - 11-1/2 NPSC 1-1/2
1-1/2 - 11-1/2 NPT(F)  w/o Reamer 1-23/32
1-1/2 - 11-1/2 NPT(F)  w/Reamer 1-45/64
1-1/2 - 11-1/2 NPSM 1-25/32
1-1/2 - 11-1/2 NPSC 1-3/4
2 - 11-1/2 NPT(F)  w/o Reamer 2-3/16
2 - 11-1/2 NPT(F)  w/Reamer 2-11/64
2 - 11-1/2 NPSM 2-1/4
2 - 11-1/2 NPSC 2-7/32

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