How many threads per Inch does National Pipe Thread have?

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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Title: How many threads per Inch does National Pipe Thread have?
Description: This is a chart that shows the pitch of National Pipe Threads.
Published: 11/6/2007
Last Edited: 12/29/2022

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