Comprehensive Guide to Schedule 40 Pipe Dimensions

SCH 40 is a standard pipe wall thickness grade, representing Schedule 40. It is commonly used to describe the wall thickness of steel pipes (such as carbon steel and stainless steel) and other materials.

SCH 40 is defined by the standards ANSI/ASME B36.10 (for carbon steel pipes) and ANSI/ASME B36.19 (for stainless steel pipes).

SCH 40 is a common wall thickness grade suitable for medium pressure and temperature applications. The wall thickness increases as the pipe’s outer diameter increases.

Schedule 40 Pipe Dimensions Chart

ANSI Schedule 40 Steel Pipes-Dimensions
Based on ASTM A53, Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded, and Seamless.

Pipe Size (in)	Diameter (in) (mm)		Nominal Thickness	Transverse Areas (in²) mm²			Length of Pipe (ft perqs. foot of surface)		Volume (ft³/ft)	Weight		Number of Threads per inch of Screw
Pipe Size (in)	External	Internal	(in) (mm)	External	Internal	Steel	External Surface (ft)	Internal Surface (ft)	Volume (ft³/ft)	(Ib/ft)	(kg/m)	Number of Threads per inch of Screw
1/8	0.405 10.3	0.27 6.86	0.07 1.78	0.13 83.9	0.06 38.7	0.07 45.2	9.43	14.20	0.0004	0.24	0.36	27
1/4	0.540 13.7	0.36 9.14	0.09 2.29	0.23 148	0.10 64.5	0.13 83.9	7.07	10.49	0.0007	0.42	0.63	18
3/8	0.675 17.1	0.49 12.4	0.09 2.29	0.36 232	0.19 123	0.17 110	5.66	7.75	0.0013	0.57	0.84	18
1/2	0.840 21.3	0.62 15.7	0.11 2.79	0.55 355	0.30 194	0.25 161	4.55	6.14	0.0021	0.85	1.26	14
3/4	1.050 26.7	0.82 20.8	0.11 2.79	0.87 561	0.53 342	0.33 213	3.64	4.64	0.0037	1.13	1.68	14
1	1.315 33.4	1.05 26.7	0.13 3.3	1.36 877	0.86 555	0.49 316	2.90	3.64	0.0060	1.68	2.50	11 1/2
1 1/4	1.660 42.2	1.38 35.1	0.14 3.56	2.16 1394	1.50 968	0.67 432	2.30	2.77	0.0104	2.27	3.38	11 1/2
1 1/2	1.900 48.3	1.61 40.9	0.15 3.81	2.84 1832	2.04 1316	0.80 516	2.01	2.37	0.0141	2.72	4.04	11 1/2
2	2.375 60.3	2.07 52.6	0.15 3.81	4.43 2858	3.36 2168	1.08 697	1.61	1.85	0.0233	3.65	5.43	11 1/2
2 1/2	2.875 73	2.47 62.7	0.20 5.08	6.49 4187	4.79 3090	1.70 1097	1.33	1.55	0.0333	5.79	8.62	8
3	3.500 88.9	3.07 78	0.22 5.59	9.62 6206	7.39 4768	2.23 1439	1.09	1.25	0.0513	7.58	11.27	8
3 1/2	4.000 102	3.55 90.2	0.23 5.84	12.56 8103	9.89 6381	2.68 1729	0.95	1.08	0.0687	9.11	13.56	8
4	4.500 114	4.03 102	0.24 6.1	15.90 10258	12.73 8213	3.17 2045	0.85	0.95	0.0884	10.79	16.06	8
5	5.563 141	5.05 128	0.26 6.6	24.30 15677	20.00 12903	4.30 2774	0.69	0.76	0.1389	14.61	21.74	8
6	6.625 168	6.07 154	0.28 7.11	34.47 22239	28.89 18639	5.58 3600	0.58	0.63	0.2006	18.97	28.23	8
8	8.625 219	7.98 203	0.32 8.13	58.42 37690	50.02 32271	8.40 5419	0.44	0.48	0.3552	28.55	42.49	8
10	10.750 273	10.02 255	0.37 9.4	90.76 58555	78.85 50871	11.90 7677	0.36	0.38	0.5476	40.48	60.24	8
12	12.750 324	11.94 303	0.41 10.4	127.64 82348	111.90 72193	15.74 10155	0.30	0.32	0.7763	53.60	79.77	8
14	14.000 356	13.13 334	0.44 11.2	153.94 99316	135.30 87290	18.64 12026	0.27	0.28	0.9354	63.00	93.75	8
16	16.000 406	15.00 381	0.50 12.7	201.05 129709	176.70 114000	24.35 15710	0.24	0.25	1.2230	78.00	116.08	8
18	18.000 457	16.88 429	0.56 14.2	254.85 164419	224.00 144516	30.85 19903	0.21	0.23	1.5550	105.00	156.26	8
20	20.000 508	18.81 478	0.59 15	314.15 202677	278.00 179354	36.15 23323	0.19	0.20	1.9260	123.00	183.05	8
24	24.000 610	22.63 575	0.69 17.5	452.40 291870	402.10 259419	50.30 32452	0.16	0.17	2.7930	171.00	254.48	8

1 in² = 645.2 mm² = 6.452 cm² = 6.452×10-4 m²
1 in = 25.4 mm
1 ft (foot) = 0.3048 m

Common Materials: Schedule 40 pipes are typically carbon steel, stainless steel, or PVC.

Applications: Commonly used for low- to medium-pressure liquid or gas transportation.

Advantages of SCH 40:

Wide Application: A widely used pipe wall thickness grade in industrial and construction fields.
Easy to Process: The medium wall thickness is convenient for welding, cutting, and installation.
Cost-Effective: More economical compared to thicker grades like SCH 80.

We offer SCH 40 pipes.

Pipe Type	Material Description	Typical Applications
SCH 40 304 Stainless Steel Pipe	ASTM 304 Stainless Steel, excellent corrosion resistance and strength.	Industrial piping, food processing, chemical equipment, etc.
SCH 40 TP304L Pipe	ASTM 304L low-carbon stainless steel, better weldability and reduced risk of intergranular corrosion.	Welded piping, pressure vessels, etc.
SCH 40 316 Stainless Steel Pipe	ASTM 316 Stainless Steel, with added molybdenum for better corrosion resistance, especially against chloride corrosion.	Chemical industry, marine environments, medical equipment, etc.
SCH 40 TP316L Pipe	ASTM 316L low-carbon stainless steel, enhanced resistance to intergranular corrosion after welding.	Welded piping, corrosion-resistant systems, etc.
Stainless Steel SCH 40 Square Pipe	Stainless steel square pipe, SCH 40 wall thickness, commonly used in structural or decorative applications.	Building structures, decorative projects, etc.
A335 P1 SCH 40 Pipe	ASTM A335 P1 alloy steel, suitable for high-temperature and high-pressure environments.	Power plants, petrochemical equipment, etc.
A335 P5 SCH 40 Pipe	ASTM A335 P5 alloy steel, containing chromium to improve heat resistance and oxidation resistance.	High-temperature steam piping, boiler piping, etc.
A335 P9 SCH 40 Pipe	ASTM A335 P9 alloy steel, high strength, high heat resistance.	Power plants, petroleum refining, etc.
A335 P11 SCH 40 Pipe	ASTM A335 P11 alloy steel, suitable for high-temperature and high-pressure systems.	Heat exchangers, furnaces, etc.
A335 P12 SCH 40 Pipe	ASTM A335 P12 alloy steel, resistant to high temperature and corrosion.	Petrochemical equipment, high-pressure piping, etc.
A335 P22 SCH 40 Pipe	ASTM A335 P22 alloy steel, resistant to high-temperature creep and high-pressure environments.	Boilers, thermal power plant piping, etc.
A335 P91 SCH 40 Pipe	ASTM A335 P91 alloy steel, ultra-high strength, and resistance to high-temperature creep.	Supercritical power plant boiler piping, etc.
ASTM A53 Grade B Schedule 40 Pipe	ASTM A53 Grade B carbon steel pipe, suitable for medium to low-pressure liquid and gas transmission.	Water pipes, gas pipelines, structural uses, etc.
ASTM A106 Gr B SCH 40 Pipe	ASTM A106 Grade B seamless carbon steel pipe, suitable for high-temperature and high-pressure systems.	High-temperature fluid or gas transmission.
ASTM A106 Grade C SCH 40 Pipe	ASTM A106 Grade C seamless carbon steel pipe, higher strength than Grade B.	High-temperature, high-pressure industrial piping.
ASTM A333 Grade 6 SCH 40 Pipe	ASTM A333 Grade 6 low-temperature carbon steel pipe, suitable for low-temperature pressure pipeline systems.	Low-temperature liquid transmission pipelines.
ASTM A333 Grade 1 SCH 40 Pipe	ASTM A333 Grade 1 low-temperature carbon steel pipe, suitable for extremely low-temperature environments.	Low-temperature pressure pipelines, chemical equipment, etc.
SCH 40 Inconel Pipe	Nickel-based alloy Inconel pipe, resistant to high temperatures and corrosion.	Aerospace, chemical, energy industries, etc.
SCH 40 Hastelloy Pipe	Nickel-based alloy Hastelloy pipe, excellent chemical corrosion resistance.	Chemical, marine environments, high-corrosion media, etc.
SCH 40 Monel Pipe	Nickel-copper alloy Monel pipe, excellent corrosion resistance and strength.	Marine engineering, chemical equipment, heat exchangers, etc.
SCH 40 Duplex Pipe	Duplex stainless steel pipe, combining strength and corrosion resistance.	Petrochemical equipment, marine pipelines, chemical installations, etc.
SCH 40 Super Duplex Pipe	Super duplex stainless steel pipe, offering higher strength and corrosion resistance.	Deep-sea pipelines, high-corrosion process systems, etc.
API 5L Grade B SCH 40 Pipe	API 5L Grade B carbon steel pipe, commonly used for oil and gas transmission.	Oil pipelines, gas pipelines, water pipes, etc.
SCH 40 API 5L X42 ~ X80 Pipe	API 5L pipes with grades X42 to X80, with higher strength as the grade number increases.	Long-distance oil and gas pipelines, high-pressure fluid transmission.
Schedule 40 Titanium Pipe	Titanium alloy pipe, offering excellent corrosion resistance and strength.	Chemical, aerospace, marine engineering, etc.

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