Pipe Taper and Straight Thread Dimensions

Pipe Taper and Straight Thread Dimensions

•National Pipe Taper and Straight Thread Dimensions

NPT Size	Threads Per Inch	Dim "A" (In.)	Dim "B" (In.)
1/16	27	.312	.261
1/8	27	.405	.264
1/4	18	.540	.402
3/8	18	.675	.408
1/2	14	.840	.534
3/4	14	1.050	.546
1	111/2	1.315	.683
11/4	111/2	1.660	.707

 

Nominal Thread Size	Threads Per Inch		Major Diameter	W	H	L
	Coarse (UNC)	Fine (UNF)
0	-	80	0.0600
1	64	72	0.0730
2	56	64	0.0860
3	48	56	0.0990
4	40	48	0.1221
5	40	44	0.1250
6	32	40	0.1380
8	32	36	0.1640
10	24	32	0.1900
12	24	28	0.2160
1/4	20	28	0.2500	7/16	11/64	0.750
5/16	18	24	0.3125	1/2	7/32	0.875
3/8	16	24	0.3750	9/16	1/4	1.000
7/16	14	20	0.4375	5/8	19/64	1.125
1/2	13	20	0.5000	3/4	11/32	1.250
9/16	12	18	0.5625	13/16	3/8	1.375
5/8	11	18	0.6250	15/16	27/64	1.500
3/4	10	16	0.7500	11/8	1/2	1.750
7/8	9	14	0.8750	15/16	37/64	2.000
1	8	12	1.0000	11/2	43/64	2.250
11/8	7	12	1.1250	111/16	3/4	2.500
11/4	7	12	1.2500	17/8	27/32	2.750
13/8	6	12	1.3750	21/16	29/32	3.000
11/2	6	12	1.5000	21/4	1	3.250

 

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