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NPT THREAD SIZES

Pipe sizes do not refer to the actual size of the pipe. The outside diameter of a pipe or fitting must be measured and compared to a table for size identification. For instance, a 1/2" pipe has an outside diameter of .84".

Nominal

Pipe Size
(inches)

Threads per Inch
TPI - pitch

Nominal Outside Pipe Diameter
OD
(inches)

Tap Drill
(inches)

1/16"

27

0.313

1/8"

27

0.405

R

1/4"

18

0.540

7/16

3/8"

18

0.675

37/64

1/2"

14

0.840

23/32

3/4"

14

1.050

59/64

1"

11-1/2

1.315

1-5/32

1-1/4"

11-1/2

1.660

1-1/2

1-1/2"

11-1/2

1.900

1-47/64

2"

11-1/2

2.375

2-7/32

2-1/2"

8

2.875

2-5/8

3"

8

3.500

3-1/4

3-1/2"

8

4.000

3-3/4

4"

8

4.500

4-1/4

4 1/2"

8

5.000

4-3/4

5"

8

5.563

5-9/32

6"

8

6.625

6-11/32

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