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	3.5	88.9	0.216	5.49	7.58	11.29
3.5	4	101.6	0.226	5.74	9.11	13.57
4	4.5	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)	40
	(mm)
1/4 inch	0.54 inch	7985
	13.7 mm	55057
3/8 inch	0.675 inch	6606
	17.1 mm	45548
1/2 inch	0.84 inch	6358
	21.3 mm	43838
3/4 inch	1.05 inch	5273
	26.7 mm	36357
1 inch	1.315 inch	4956
	33.4 mm	34172
1 1/4 inch	1.66 inch	4133
	42.2 mm	28497
1 1/2 inch	1.9 inch	3739
	48.3 mm	25780
2 inch	2.375 inch	3177
	60.3 mm	21905
2 1/2 inch	2.875 inch	3460
	73 mm	23857
3 inch	3.5 inch	3024
	88.9 mm	20850
3 1/2 inch	4 inch	2769
	102 mm	19092
4 inch	4.5 inch	2581
	114 mm	17796
5 inch	5.563 inch	2273
	141 mm	15672
6 inch	6.625 inch	2071
	168 mm	14280
8 inch	8.625 inch	1829
	219 mm	12611
10 inch	10.75 inch	1664
	273 mm	11473
12 inch	12.75 inch	1560
	324 mm	10756
14 inch	14 inch	1533
	356 mm	10570
16 inch	16 inch	1531
	406 mm	10556
18 inch	18 inch	1530
	457 mm	10549
20 inch	20 inch	1455
	508 mm	10032
22 inch	22 inch
	559 mm
24 inch	24 inch	1405
	610 mm	9687
30 inch	30 inch
	762 mm
32 inch	32 inch	1054
	813 mm	7267
34 inch	34 inch	992
	864 mm	6840
36 inch	36 inch	1021
	914 mm	7040
42 inch	42 inch	875
	1067 mm	6033