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Pipe Schedules for Steel and Metal

The internal diameter of a pipe is a critical dimension, also known as nominal bore (NB). The pipe wall thickness can also play a significant role, as it affects the pipe's strength and the kind of technology that can be applied to that pipework. Wall thickness is expressed in "schedules", referred to as pipe schedules.

Please see the table below, which will help you calculate wall thickness based on Pipe Schedule and Nominal Bore.

The following abbreviations have been used: NB - nominal bore, STD - Standard, EH - Extra Heavy, DBL EH - Double Extra Heavy, OD - Outside Diameter.

		Pipe Schedule Pipe Wall Thickness (inches)
Nominal	OD Inches	5s	5	10s	10	20	30	40s & Std	40	60	80s & EH	80	100	120	140	160	DBL E.H.
1/8	.405		.035	.049	.049			.068	.068		.095	.095
1/4	.540		.049	.065	.065			.088	.088		.119	.119
3/8	.675		.049	.065	.065			.091	.091		.126	.126
1/2	.840	.065	.065	.083	.083			.109	.109		.147	.147				.187	.294
3/4	1.050	.065	.065	.083	.083			.113	.113		.154	.154				.218	.308
1	1.315	.065	.065	.109	.109			.133	.133		.179	.179				.250	.358
1 1/4	1.660	.065	.065	.109	.109			.140	.140		.191	.191				.250	.382
1 1/2	1.900	.065	.065	.109	.109			.145	.145		.200	.200				.281	.400
2	2.375	.065	.065	.109	.109			.154	.154		.218	.218				.343	.436
2 1/2	2.875	.083	.083	.120	.120			.203	.203		.276	.276				.375	.552
3	3.500	.083	.083	.120	.120			.216	.216		.300	.300				.437	.600
3 1/2	4.000	.083	.083	.120	.120			.226	.226		.318	.318					.636
4	4.500	.083	.083	.120	.120			.237	.237	.281	.337	.337		.437		.531	.674
4 1/2	5.000							.247			.355						.710
5	5.563	.109	.109	.134	.134			.258	.258		.375	.375		.500		.625	.750
6	6.625	.109	.109	.134	.134			.280	.280		.432	.432		.562		.718	.864
7	7.625							.301			.500						.875
8	8.625	.109	.109	.148	.148	.250	.277	.322	.322	.406	.500	.500	.593	.718	.812	.906	.875
9	9.625							.342			.500
10	10.750	.134	.134	.165	.165	.250	.307	.365	.365	.500	.500	.593	.718	.843	1.000	1.125
11	11.750							.375			.500
12	12.750	.156	.165	.180	.180	.250	.330	.375	.406	.562	.500	.687	.843	1.000	1.125	1.312
14	14.000	.156		.188	.250	.312	.375	.375	.437	.593	.500	.750	.937	1.093	1.250	1.406
16	16.000	.165		.188	.250	.312	.375	.375	.500	.656	.500	.843	1.031	1.218	1.437	1.593
18	18.000	.165		.188	.250	.312	.437	.375	.562	.750	.500	.937	1.156	1.375	1.562	1.781
20	20.000	.188		.218	.250	.375	.500	.375	.593	.812	.500	1.031	1.280	1.500	1.750	1.968
24	24.000	.218		.250	.250	.375	.562	.375	.687	.968	.500	1.218	1.531	1.812	2.062	2.343
26	26.000				.312	.500		.375			.500
28	28.000				.312	.500	.625	.375
30	30.000	.250		.312	.312	.500	.625	.375			.500
32	32.000				.312	.500	.625	.375	.688		.500
34	34.000				.312	.500	.625	.375	.688
36	36.000				.312		.625	.375	.750		.500