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How many threads per Inch does National Pipe Thread have?
Article Title: How many threads per Inch does National Pipe Thread have?
Article Summary: This is a chart that shows the pitch of National Pipe Threads.
Article Date: 11/6/2007
Article ID: 737
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American Standard Pipe Thread Taper

Pipe Size

(inches)

Threads per inch

TPI  - pitch

Outside Diameter

OD

(inches)

1/16”

27

0.313”

1/8”

27

.405”

1/4”

18

.540”

3/8”

18

.0675”

1/2”

14

.840”

3/4”

14

1.050”

1”

11-1/2

1.315”

1-1/4”

11-1/2

1.660”

1-1/2”

11-1/2

1.900”

2”

11-1/2

2.375”

2-1/2”

8

2.875”

3”

8

3.500”

3-1/2”

8

4.00”

4”

8

4.500”

5”

8

5.563”

6”

8

6.625”

8”

8

8.625”

10”

8

10.750”

12”

8

12.750”

14”

8

14.000”

16”

8

16.000”



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