Pipe Wall Thickness Charts by Schedule (WT)

Quick Reference

Pipe wall thickness is designated by Schedule (Sch). Common schedules: 5, 10, 40 (STD), 80 (XS), 160, XXS. For same NPS, higher schedule = thicker wall. ASME B36.10: carbon/alloy steel. ASME B36.19: stainless/nickel alloy. Tolerance: ±12.5% nominal WT. Full size charts: ASME B36.10/B36.19.

Pipe schedule charts, extracted from the ASME B36.10 and ASME B36.19 specifications, are useful in the engineering and design of piping systems across various industries. These charts provide standardized wall thickness dimensions for carbon, alloy, stainless steel pipes, facilitating the selection and specification process for engineers, designers, and industry professionals. Understanding these charts and their applications is crucial for ensuring that piping systems are designed and constructed to meet the required standards for safety, efficiency, and reliability.

Pipe Schedule Charts

Pipes Wall Thickness in Inches (by NPS/Schedule)

This article focuses on the standard wall thickness sizes (in inches and in millimeters) of carbon, alloy, stainless/duplex, and nickel alloy pipes. The wall thickness is expressed according to a special designation, called “Schedule”.

Pipe Sizes (OD, WT=SCH, ID)Learn more about the concept of Pipe Schedule.

To view the dimensions and weights (in Lbs/ft and Kg/m) of steel pipes, consult the broader ASME B36.10M and ASME B36.19M pipe sizes charts.

Carbon and Alloy Steel Pipes (ASME B36.10M)

The table shows the wall thickness in inches for combinations of pipe NPS (nominal pipe size) and SCH (pipe schedule) – for carbon/alloy steel ASTM grades (according to the ASME B36.10M Specification):

NPS	OD (inches)	Sch 5	Sch 10	Sch 20	Sch 30	Sch 40	Sch Std	Sch 60	Sch 80	Sch XS	Sch 100	Sch 120	Sch 140	Sch 160	Sch XXS	NPS
1/8	0.405		0.049			0.068	0.068		0.095	0.095						1/8
1/4	0.54		0.065			0.088	0.088		0.119	0.119						1/4
3/8	0.675		0.065		0.073	0.091	0.091		0.126	0.126						3/8
1/2	0.84	0.065	0.083		0.095	0.109	0.109		0.147	0.147				0.188	0.294	1/2
3/4	1.05	0.065	0.083		0.095	0.113	0.113		0.154	0.154				0.219	0.308	3/4
1	1.315	0.065	0.109		0.114	0.133	0.133		0.179	0.179				0.25	0.358	1
1 1/4	1.66	0.065	0.109		0.117	0.14	0.14		0.191	0.191				0.25	0.382	1 1/4
1 1/2	1.9	0.065	0.109		0.125	0.145	0.145		0.2	0.2				0.281	0.4	1 1/2
2	2.375	0.065	0.109		0.125	0.154	0.154		0.218	0.218				0.344	0.436	2
2 1/2	2.875	0.083	0.12		0.188	0.203	0.203		0.276	0.276				0.375	0.552	2 1/2
3	3.5	0.083	0.12		0.188	0.216	0.216		0.3	0.3				0.438	0.6	3
3 1/2	4	0.083	0.12		0.188	0.226	0.226		0.318	0.318					0.636	3 1/2
4	4.5	0.083	0.12		0.188	0.237	0.237		0.337	0.337		0.438		0.531	0.674	4
5	5.563	0.109	0.134			0.258	0.258		0.375	0.375		0.5		0.625	0.75	5
6	6.625	0.109	0.134			0.28	0.28		0.432	0.432		0.562		0.719	0.864	6
8	8.625	0.109	0.148	0.25	0.277	0.322	0.322	0.406	0.5	0.5	0.594	0.719	0.812	0.906	0.875	8
10	10.75	0.134	0.165	0.25	0.307	0.365	0.365	0.5	0.594	0.5	0.719	0.844	1	1.125	1	10
12	12.75	0.156	0.18	0.25	0.33	0.406	0.375	0.562	0.688	0.5	0.844	1	1.125	1.312	1	12
14	14	0.156	0.25	0.312	0.375	0.438	0.375	0.594	0.75	0.5	0.938	1.094	1.25	1.406		14
16	16	0.165	0.25	0.312	0.375	0.5	0.375	0.656	0.844	0.5	1.031	1.219	1.438	1.594		16
18	18	0.165	0.25	0.312	0.438	0.562	0.375	0.75	0.938	0.5	1.156	1.375	1.562	1.781		18
20	20	0.188	0.25	0.375	0.5	0.594	0.375	0.812	1.031	0.5	1.281	1.5	1.75	1.969		20
22	22	0.188	0.25	0.375	0.5		0.375	0.875	1.125	0.5	1.375	1.625	1.875	2.125		22
24	24	0.218	0.25	0.375	0.562	0.688	0.375	0.969	1.219	0.5	1.531	1.812	2.062	2.344		24
26	26		0.312	0.5			0.375			0.5						26
28	28		0.312	0.5	0.625		0.375			0.5						28
30	30	0.25	0.312	0.5	0.625		0.375			0.5						30
32	32		0.312	0.5	0.625	0.688	0.375			0.5						32
34	34		0.312	0.5	0.625	0.688	0.375			0.5						34
36	36		0.312	0.5	0.625	0.75	0.375			0.5						36
NPS	OD (inches)	Sch 5	Sch 10	Sch 20	Sch 30	Sch 40	Sch Std	Sch 60	Sch 80	Sch XS	Sch 100	Sch 120	Sch 140	Sch 160	Sch XXS	NPS

Download Pipe Schedule Chart ASME B36.10

STAINLESS/DUPLEX STEEL & NICKEL ALLOY PIPES (ASME B36.19M)

The table shows the wall thickness in inches for combinations of pipe NPS (nominal pipe size) and SCH (pipe schedule) – for stainless steel, duplex/super duplex steel, and nickel alloy ASTM grades (according to the ASME B36.19M Specification):

NPS	OD (in Inch.)	5S	10S	40S	80S	NPS
1/8	0.405		0.049	0.068	0.095	1/8
1/4	0.54		0.065	0.088	0.119	1/4
3/8	0.675		0.065	0.091	0.126	3/8
1/2	0.84	0.065	0.083	0.109	0.147	1/2
3/4	1.05	0.065	0.083	0.113	0.154	3/4
1	1.315	0.065	0.109	0.133	0.179	1
1 1/4	1.66	0.065	0.109	0.14	0.191	1 1/4
1 1/2	1.9	0.065	0.109	0.145	0.2	1 1/2
2	2.375	0.065	0.109	0.154	0.218	2
2 1/2	2.875	0.083	0.12	0.203	0.276	2 1/2
3	3.5	0.083	0.12	0.216	0.3	3
3 1/2	4	0.083	0.12	0.226	0.318	3 1/2
4	4.5	0.083	0.12	0.237	0.337	4
5	5.563	0.109	0.134	0.258	0.375	5
6	6.625	0.109	0.134	0.28	0.432	6
8	8.625	0.109	0.148	0.322	0.5	8
10	10.75	0.134	0.165	0.365	0.5	10
12	12.75	0.156	0.18	0.375	0.5	12
14	14	0.156	0.188	0.375	0.5	14
16	16	0.165	0.188	0.375	0.5	16
18	18	0.165	0.188	0.375	0.5	18
20	20	0.188	0.218	0.375	0.5	20
22	22	0.188	0.218			22
24	24	0.218	0.25	0.375	0.5	24
30	30	0.25	0.312			30
NPS	OD (in Inch.)	5S	10S	40S	80S	NPS

Download Pipe Schedule Chart ASME B36.19

Pipes Wall Thickness in Millimeters (by DN/Schedule)

Carbon and Alloy Steel Pipes (ASME B36.10M)

The table shows the wall thickness in millimeters for combinations of pipe DN (nominal diameter) and SCH (pipe schedule) – for carbon/alloy steel ASTM grades (according to the ASME B36.10M Specification):

DN (mm)	OD (mm)	Sch 5	Sch 10	Sch 20	Sch 30	Sch 40	Sch Std	Sch 60	Sch 80	Sch XS	Sch 100	Sch 120	Sch 140	Sch 160	Sch XXS
6	10.3		1.24			1.73	1.73		2.41	2.41
8	13.7		1.65			2.24	2.24		3.02	3.02
10	17.1		1.65		1.85	2.31	2.31		3.2	3.2
15	21.3	1.65	2.11		2.41	2.77	2.77		3.73	3.73				4.78	7.47
20	26.7	1.65	2.11		2.41	2.87	2.87		3.91	3.91				5.56	7.82
25	33.4	1.65	2.77		2.9	3.38	3.38		4.55	4.55				6.35	9.09
32	42.2	1.65	2.77		2.97	3.56	3.56		4.85	4.85				6.35	9.7
40	48.3	1.65	2.77		3.18	3.68	3.68		5.08	5.08				7.14	10.16
50	60.3	1.65	2.77		3.18	3.91	3.91		5.54	5.54				8.74	11.07
65	73	2.11	3.05		4.78	5.16	5.16		7.01	7.01				9.53	14.02
80	88.9	2.11	3.05		4.78	5.49	5.49		7.62	7.62				11.13	15.24
90	101.6	2.11	3.05		4.78	5.74	5.74		8.08	8.08					16.15
100	114.3	2.11	3.05		4.78	6.02	6.02		8.56	8.56		11.13		13.49	17.12
125	141.3	2.77	3.4			6.55	6.55		9.53	9.53		12.7		15.88	19.05
150	168.3	2.77	3.4			7.11	7.11		10.97	10.97		14.27		18.26	21.95
200	219.1	2.77	3.76	6.35	7.04	8.18	8.18	10.31	12.7	12.7	15.09	18.26	20.62	23.01	22.23
250	273	3.4	4.19	6.35	7.8	9.27	9.27	12.7	15.09	12.7	18.26	21.44	25.4	28.58	25.4
300	323.8	3.96	4.57	6.35	8.38	10.31	9.53	14.27	17.48	12.7	21.44	25.4	28.58	33.32	25.4
350	355.6	3.96	6.35	7.92	9.53	11.13	9.53	15.09	19.05	12.7	23.83	27.79	31.75	35.71
400	406.4	4.19	6.35	7.92	9.53	12.7	9.53	16.66	21.44	12.7	26.19	30.96	36.53	40.49
450	457	4.19	6.35	7.92	11.13	14.27	9.53	19.05	23.83	12.7	29.36	34.93	39.67	45.24
500	508	4.78	6.35	9.53	12.7	15.09	9.53	20.62	26.19	12.7	32.54	38.1	44.45	50.01
550	559	4.78	6.35	9.53	12.7		9.53	22.23	28.58	12.7	34.93	41.28	47.63	53.98
600	610	5.54	6.35	9.53	14.27	17.48	9.53	24.61	30.96	12.7	38.89	46.02	52.37	59.54
650	660		7.92	12.7			9.53			12.7
700	711		7.92	12.7	15.88		9.53			12.7
750	762	6.35	7.92	12.7	15.88		9.53			12.7
800	813		7.92	12.7	15.88	17.48	9.53			12.7
850	864		7.92	12.7	15.88	17.48	9.53			12.7
900	914		7.92	12.7	15.88	19.05	9.53			12.7
950							9.53			12.7
1000							9.53			12.7
1050							9.53			12.7
1100							9.53			12.7
1150							9.53			12.7
1200							9.53			12.7

STAINLESS/DUPLEX STEEL & NICKEL ALLOY PIPES (ASME B36.19M)

The table shows the wall thickness in millimeters for combinations of pipe NPS (nominal diameter) and SCH (pipe schedule) – for stainless steel, duplex/super duplex steel, and nickel alloy ASTM grades (according to the ASME B36.19M Specification):

DN (mm)	OD (mm)	Sch 5s	Sch 10s	Sch 40s	Sch 80s
6	10.3		1.24	1.73	2.41
8	13.7		1.65	2.24	3.02
10	17.1		1.65	2.31	3.2
15	21.3	1.65	2.11	2.77	3.73
20	26.7	1.65	2.11	2.87	3.91
25	33.4	1.65	2.77	3.38	4.55
32	42.2	1.65	2.77	3.56	4.85
40	48.3	1.65	2.77	3.68	5.08
50	60.3	1.65	2.77	3.91	5.54
65	73	2.11	3.05	5.16	7.01
80	88.9	2.11	3.05	5.49	7.62
90	101.6	2.11	3.05	5.74	8.08
100	114.3	2.11	3.05	6.02	8.56
125	141.3	2.77	3.4	6.55	9.53
150	168.3	2.77	3.4	7.11	10.97
200	219.1	2.77	3.76	8.18	12.7
250	273	3.4	4.19	9.27	12.7
300	323.8	3.96	4.57	9.53	12.7
350	355.6	3.96	4.78	9.53	12.7
400	406.4	4.19	4.78	9.53	12.7
450	457	4.19	4.78	9.53	12.7
500	508	4.78	5.54	9.53	12.7
550	559	4.78	5.54
600	610	5.54	6.35	9.53	12.7
750	762	6.35	7.92

Related Articles

• Pipe Sizes Charts (ASME B36.10/B36.19) - Complete dimensions and weights by schedule
• EN 10220/EN 1127 EU Pipe Sizes - European pipe dimension standards
• Pipes Terminology - Key terms: NPS, OD, WT, schedule, DN
• ASTM Materials for Carbon Steel Pipes - A53, A106, A333 specifications
• ASTM Materials for Stainless/Duplex Pipes - A312, A790 specifications