Nominal Pipe Size (inch)	Number of threads per inch	Outside Diameter (inch)	Outside Diameter (mm)	Pitch of thread		Depth of thread		Truncation, max.”**		Pitch diameter at plane of hand-tight engagement		Length from end of pipe to plane of hand-tight engagement		Length of useful thread		Length of washout thread		Pitch Diameter at Beginning of External Thread Start (inch)	Effective Thread, External Diameter (inch)
				P		h		l		E		L1		L2
				in	mm	in	mm	in	mm	in	mm	in	Threads	in	Threads	in	Threads
1⁄16	27	0.3125	7.938	0.03704	0.941	0.02963	0.753			0.28118		0.16		0.2611		0.1285	3.47	0.27118	0.28750
1/8"	27	0.405	10.287	0.03704	0.941	0.02963	0.753	0.00360	0.091	0.37360	9.489	0.162	4.36	0.2639	7.12	0.1285	3.47	0.36351	0.38000
1/4"	18	0.540	13.716	0.05556	1.411	0.04444	1.129	0.00490	0.124	0.49163	12.487	0.228	4.10	0.4018	7.23	0.1928	3.47	0.47739	0.50250
3/8"	18	0.675	17.145	0.05556	1.411	0.04444	1.129	0.00490	0.124	0.62701	15.926	0.240	4.32	0.4078	7.34	0.1928	3.47	0.61201	0.63750
1/2"	14	0.840	21.336	0.07143	1.814	0.05714	1.451	0.00560	0.142	0.77843	19.772	0.320	4.48	0.5337	7.47	0.2478	3.47	0.75843	0.79179
3/4"	14	1.050	26.670	0.07143	1.814	0.05714	1.451	0.00560	0.142	0.98887	25.117	0.339	4.75	0.5457	7.64	0.2478	3.47	0.96768	1.00179
1"	11.5	1.315	33.401	0.08696	2.209	0.06957	1.767	0.00630	0.160	1.23863	31.461	0.400	4.60	0.6828	7.85	0.3017	3.47	1.21363	1.25630
1-1/4"	11.5	1.660	42.164	0.08696	2.209	0.06957	1.767	0.00630	0.160	1.58338	40.218	0.420	4.83	0.7068	8.13	0.3017	3.47	1.55713	1.60130
1-1/2"	11.5	1.900	48.260	0.08696	2.209	0.06957	1.767	0.00630	0.160	1.82234	46.287	0.402	4.83	0.7235	8.32	0.3017	3.47	1.79609	1.84130
2"	11.5	2.375	60.325	0.08696	2.209	0.06957	1.767	0.00630	0.160	2.29627	58.325	0.436	5.01	0.7565	8.70	0.3017	3.47	2.26902	2.31630
2-1/2"	8	2.875	73.025	0.12500	3.175	0.10000	2.540	0.00780	0.198	2.76215	70.159	0.682	5.46	1.1375	9.10	0.4337	3.47	2.71953	2.79062
3"	8	3.500	88.900	0.12500	3.175	0.10000	2.540	0.00780	0.198	3.38850	86.068	0.766	6.13	1.2000	9.60	0.4337	3.47	3.34062	3.41562
3-1/2"	8	4	101.600	0.12500	3.175	0.10000	2.540	0.00780	0.198	3.88881	98.776	0.821	6.57	1.2500	10.00	0.4337	3.47	3.83750	3.91562
4"	8	4.5	114.300	0.12500	3.175	0.10000	2.540	0.00780	0.198	4.38712	111.433	0.844	6.75	1.3000	10.40	0.4337	3.47	4.33438	4.41562
5"	8	5.563	141.300	0.12500	3.175	0.10000	2.540	0.00780	0.198	5.44929	138.412	0.937	7.50	1.4063	11.25	0.4337	3.47	5.39073	5.47862
6"	8	6.625	168.275	0.12500	3.175	0.10000	2.540	0.00780	0.198	6.50597	165.252	0.958	7.66	1.5125	12.10	0.4337	3.47	6.44609	6.54062
8"	8	8.625	219.075	0.12500	3.175	0.10000	2.540	0.00780	0.198	8.50003	215.901	1.630	8.50	1.7125	13.70	0.4337	3.47	8.43359	8.54062
10"	8	10.750	273.050	0.12500	3.175	0.10000	2.540	0.00780	0.198	10.62094	296.772	1.210	9.58	1.9250	15.40	0.4337	3.47	10.54531	10.66562
12"	8	12.750	323.850	0.12500	3.175	0.10000	2.540	0.00780	0.198	12.61781	320.493	1.360	10.88	2.1250	17.00	0.4337	3.47	12.53281	12.66562
14"	8	14	355.600	0.12500	3.175	0.10000	2.540	0.00780	0.198	13.87262	352.365	1.562	12.50	2.2500	18.00	0.4337	3.47	13.77500	13.91562
16"	8	16	406.400	0.12500	3.175	0.10000	2.540	0.00780	0.198	15.87575	403.244	1.812	14.50	2.4500	19.60	0.4337	3.47	15.76250	15.91562
18"	8	18	457.200	0.12500	3.175	0.10000	2.540	0.00780	0.198	17.87500	454.025	2.000	16.00	2.6500	21.20	0.4337	3.47	17.75000	17.91562
20"	8	20	508.000	0.12500	3.175	0.10000	2.540	0.00780	0.198	19.87031	504.706	2.125	17.00	2.8500	22.80	0.4337	3.47	19.73750	19.91562
24"	8	24	609.600	0.12500	3.175	0.10000	2.540	0.00780	0.198	23.68094	606.066	2.375	19.00	3.2500	26.00	0.4337	3.47	23.71250	23.91562