Schedule 40 Seamless pipe Specifications

If you’re searching for Schedule 40 pipe specifications, seamless steel pipe dimensions, or ASME B36.10M standards, this comprehensive guide breaks down everything you need to know. Learn what Schedule 40 means, how it impacts pipe performance, and why it’s a top choice for industrial and plumbing applications.

What is the meaning of Schedule 40 pipe?

Schedule 40 (Sch 40) is a standardized pipe thickness classification under the ASME B36.10M and B36.19M codes. It defines the wall thickness and pressure capacity of pipes based on their Nominal Pipe Size (NPS). Unlike direct pressure ratings, the “Schedule” number correlates to a pipe’s ability to withstand stress, with Sch 40 being a common mid-range thickness for general-purpose use.

Key Features of Schedule 40 Pipes:

Suitable for seamless pipe and ERW (Electric Resistance Welded) steel pipes.

Balances durability, weight, and cost for HVAC, plumbing, and low/medium-pressure systems.

Wall thickness and inner diameter (ID) vary by NPS but maintain consistent outer diameter (OD).

Seamless pipe schedule 40 specifications

The table below outlines key dimensions for Schedule 40 carbon steel pipes. All measurements align with ASME B36.10M standards.

Sch40: indicates tensile strength, 40 kg pressure. It can be detected through standard thickness of 4.0mm. Tubes of different diameter, different pressures, different wall thickness.
Pipes schedule 40 chart, dimensions, weight and pipe wall thickness and Steel Metal Weight Calculator
Pipes schedule 40 chart gives dimensions of steel pipes schedule 40. The chart includes sizes in inches and in millimeters.

Nominal size [inches]	Outside diameter [inches]	Outside diameter [mm]	Wall thickness [inches]	Wall thickness [mm]	Weight [lb/ft]	Weight [kg/m]
1/8	0.405	10.3	0.068	1.73	0.24	0.37
1/4	0.54	13.7	0.088	2.24	0.42	0.84
1/2	0.84	21.3	0.109	2.77	0.85	1.27
3/4	1.05	26.7	0.113	2.87	1.13	1.69
1	1.315	33.4	0.133	3.38	1.68	2.5
1.25	1.66	42.2	0.14	3.56	2.27	3.39
1.5	1.9	48.3	0.145	3.68	2.72	4.05
2	2.375	60.3	0.154	3.91	3.65	5.44
2.5	2.875	73	0.203	5.16	5.79	8.63
3	3.500	88.9	0.216	5.49	7.58	11.29
3.5	4.000	101.6	0.226	5.74	9.11	13.57
4	4.500	114.3	0.237	6.02	10.79	16.07
5	5.563	141.3	0.258	6.55	14.62	21.77
6	6.625	168.3	0.28	7.11	18.97	28.26
8	8.625	219.1	0.322	8.18	28.55	42.55
10	10.75	273	0.365	9.27	40.48	60.31
12	12.75	323.8	0.406	10.31	53.52	79.73
14	14	355.6	0.375	11.13	54.57	94.55
16	16	406.4	0.5	12.7	82.77	123.3
18	18	457	0.562	14.27	104.67	155.8
20	20	508	0.594	15.09	123.11	183.42
24	24	610	0.688	17.48	171.29	255.41
32	32	813	0.688	17.48	230.08	342.91

Applications of Schedule 40 Seamless Pipes

Plumbing Systems: Water supply, drainage, and gas lines.

HVAC: Ductwork and refrigerant transport.

Industrial Use: Chemical processing, oil & gas (non-high-pressure).

Structural Projects: Handrails, scaffolding, and support frameworks.

Global Standards for Schedule 40 Pipes

ASME B36.10M: U.S. standard for welded/seamless wrought steel pipes.

ASTM A106/A53: Material specs for high-temperature Sch 40 carbon steel pipes.

ISO 65, GB/T 8163, HG 20553: International equivalents in Europe and Asia.

Schedule 40 pipes thickness in mm

Nominal size [inches]	Outside diameter [inches]	Outside diameter [mm]	Wall thickness [inches]	Wall thickness [mm]	Weight [lb/ft]	Weight [kg/m]
1/8 inches	0.405 inches	10.3 MM	0.068 inches	1.73 MM	0.24 lb/ft	0.37 kg/m
1/4 inches	0.540 inches	13.7 MM	0.088 inches	2.24 MM	0.42 lb/ft	0.84 kg/m
1/2 inches	0.840 inches	21.3 MM	0.109 inches	2.77 MM	0.85 lb/ft	1.27 kg/m
3/4 inches	1.050 inches	26.7 MM	0.113 inches	2.87 MM	1.13 lb/ft	1.69 kg/m
1 inches	1.315 inches	33.4 MM	0.133 inches	3.38 MM	1.68 lb/ft	2.50 kg/m
1 1/4 inches	1.660 inches	42.2 MM	0.140 inches	3.56 MM	2.27 lb/ft	3.39 kg/m
1 1/2 inches	1.900 inches	48.3 MM	0.145 inches	3.68 MM	2.72 lb/ft	4.05 kg/m
2 inches	2.375 inches	60.3 MM	0.154 inches	3.91 MM	3.65 lb/ft	5.44 kg/m
2 1/2 inches	2.875 inches	73.0 MM	0.203 inches	5.16 MM	5.79 lb/ft	8.63 kg/m
3 inches	3.500 inches	88.9 MM	0.216 inches	5.49 MM	7.58 lb/ft	11.29 kg/m
3 1/2 inches	4.000 inches	101.6 MM	0.226 inches	5.74 MM	9.11 lb/ft	13.57 kg/m
4 inches	4.500 inches	114.3 MM	0.237 inches	6.02 MM	10.79 lb/ft	16.07 kg/m
5 inches	5.563 inches	141.3 MM	0.258 inches	6.55 MM	14.62 lb/ft	21.77 kg/m
6 inches	6.625 inches	168.3 MM	0.280 inches	7.11 MM	18.97 lb/ft	28.26 kg/m
8 inches	8.625 inches	219.1 MM	0.322 inches	8.18 MM	28.55 lb/ft	42.55 kg/m
10 inches	10.750 inches	273.0 MM	0.365 inches	9.27 MM	40.48 lb/ft	60.31 kg/m
12 inches	12.750 inches	323.8 MM	0.406 inches	10.31 MM	53.52 lb/ft	79.73 kg/m
14 inches	14 inches	355.6 MM	0.375 inches	11.13 MM	54.57 lb/ft	94.55 kg/m
16 inches	16 inches	406.4 MM	0.500 inches	12.70 MM	82.77 lb/ft	123.30 kg/m
18 inches	18 inches	457.0 MM	0.562 inches	14.27 MM	104.67 lb/ft	155.80 kg/m
20 inches	20 inches	508.0 MM	0.594 inches	15.09 MM	123.11 lb/ft	183.42 kg/m
24 inches	24 inches	610.0 MM	0.688 inches	17.48 MM	171.29 lb/ft	255.41 kg/m
32 inches	32 inches	813.0 MM	0.688 inches	17.48 MM	230.08 lb/ft	342.91 kg/m

Schedule 40 pipes pressure rating

Maximum Allowable Pressure (psi) (kPa)
NPS	Outside Diameter	Schedule
(inch)	(inch) (mm)	40
1/4 inch	0.54 inch 13.7 mm	7985 55057
3/8 inch	0.675 inch 17.1 mm	6606 45548
1/2 inch	0.84 inch 21.3 mm	6358 43838
3/4 inch	1.05 inch 26.7 mm	5273 36357
1 inch	1.315 inch 33.4 mm	4956 34172
1 1/4 inch	1.66 inch 42.2 mm	4133 28497
1 1/2 inch	1.9 inch 48.3 mm	3739 25780
2 inch	2.375 inch 60.3 mm	3177 21905
2 1/2 inch	2.875 inch 73 mm	3460 23857
3 inch	3.5 inch 88.9 mm	3024 20850
3 1/2 inch	4 inch 102 mm	2769 19092
4 inch	4.5 inch 114 mm	2581 17796
5 inch	5.563 inch 141 mm	2273 15672
6 inch	6.625 inch 168 mm	2071 14280
8 inch	8.625 inch 219 mm	1829 12611
10 inch	10.75 inch 273 mm	1664 11473
12 inch	12.75 inch 324 mm	1560 10756
14 inch	14 inch 356 mm	1533 10570
16 inch	16 inch 406 mm	1531 10556
18 inch	18 inch 457 mm	1530 10549
20 inch	20 inch 508 mm	1455 10032
22 inch	22 inch 559 mm
24 inch	24 inch 610 mm	1405 9687
30 inch	30 inch 762 mm
32 inch	32 inch 813 mm	1054 7267
34 inch	34 inch 864 mm	992 6840
36 inch	36 inch 914 mm	1021 7040
42 inch	42 inch 1067 mm	875 6033