NPT & NPTF NPS & NPSF Drill Size* Pitch Drill Size (TPI ...

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NPT & NPTF

NPS & NPSF

Pipe Tap Size

Pitch (TPI)

1/16

27

1/8

27

1/4

18

3/8

18

1/2

14

3/4

14

1

11-1/2

1-1/4

11-1/2

1-1/2

11-1/2

2

11-1/2

2-1/2

8

3

8

3-1/2

8

4

8

*Without taper reamer

Drill Size* (inch)

0.242 (C) 0.332 (Q)

7/16 9/16 45/64 29/32 1-9/64 1-31/64 1-23/32 2-7/32 2-5/8 3-1/4 3-3/4 4-1/4

Pitch (TPI)

27 18 18 14 14 11-1/2 11-1/2 11-1/2 11-1/2 8 8 8 8

Drill Size (inch)

0.348 (S)

29/64 19/32 47/64 15/16 1-3/16 1-33/64 1-3/4 2-7/32 2-21/32 3-9/32 3-25/32 4-9/32

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