Schedule 40 Steel Pipe Sizes and Dimensions ANSI

In addition to different materials, pipe comes in a variety of sizes categorized by schedule. Schedule 40 steel pipe is one of the most common materials used in a wide variety of construction and building applications. From gas lines to water lines, schedule 40 steel pipe’s characteristics, including diameter, strength and reactivity, make it a construction standard.

SCH40 steel pipe

40 steel pipe is typically made from a low-carbon or mild steel. These steels are typically categorized by having a carbon content less than .2 percent.

Material of SCH40 steel pipe

However, for particular applications where a corrosion resistant material is needed, schedule 40 steel pipe may be galvanized, or plated with a layer of zinc to protect the underlying steel. For extreme applications, or applications where zinc is not appropriate, SCH40 steel pipe may employ stainless steel instead.

Measurements of SCH40 steel pipe

The term schedule in SCH40 steel pipe applies to the measurement of the steel pipe. Specifically, schedule refers to the wall thickness of the pipe while a secondary term applies to the diameter, inside and outside, of the pipe. However, since the schedule attempts to standardize the overall strength of the pipe, the wall thickness does vary depending on the diameter. can therefore have a wall thickness between 1.727 mm for pipe with a diameter of 1/8 of an inch and gets as thick as 9.525 mm for pipe with a diameter of 24 inches.

Strength of SCH40 steel pipe

According to the University of Massachusetts, the hardness of schedule 40 steel pipe was measured to be 16.1 on the Rockwell scale. It was also found to have a yield strength of 423 MPa, an ultimate strength of 470 MPa and an elastic modulus of 225 GPa.

Steel Pipes Dimensions – ANSI Schedule 40

Pipe Size 
(in)
Diameter
(in)
Nominal Thickness
(in)
Transverse Areas
(in2)
Length of Pipe
(per sq. foot of)
Volume
(ft3/ft)
Weight Number of Threads per inch of Screw
External Internal External Internal Steel External Surface
(ft)
Internal Surface(ft) lb/ft kg/m
1/8 0.41 0.27 0.07 0.13 0.06 0.07 9.43 14.20 0.0004 0.24 0.36 27
¼ 0.54 0.36 0.09 0.23 0.10 0.13 7.07 10.49 0.0007 0.42 0.63 18
3/8 0.68 0.49 0.09 0.36 0.19 0.17 5.66 7.75 0.0013 0.57 0.84 18
½ 0.84 0.62 0.11 0.55 0.30 0.25 4.55 6.14 0.0021 0.85 1.26 14
¾ 1.05 0.82 0.11 0.87 0.53 0.33 3.64 4.64 0.0037 1.13 1.68 14
1 1.32 1.05 0.13 1.36 0.86 0.49 2.90 3.64 0.0060 1.68 2.50 11 ½
1 ¼ 1.66 1.38 0.14 2.16 1.50 0.67 2.30 2.77 0.0104 2.27 3.38 11 ½
1 ½ 1.90 1.61 0.15 2.84 2.04 0.80 2.01 2.37 0.0141 2.72 4.04 11 ½
2 2.38 2.07 0.15 4.43 3.36 1.08 1.61 1.85 0.0233 3.65 5.43 11 ½
2 ½ 2.88 2.47 0.20 6.49 4.79 1.70 1.33 1.55 0.0333 5.79 8.62 8
3 3.50 3.07 0.22 9.62 7.39 2.23 1.09 1.25 0.0513 7.58 11.27 8
3 ½ 4.00 3.55 0.23 12.56 9.89 2.68 0.95 1.08 0.0687 9.11 13.56 8
4 4.50 4.03 0.24 15.90 12.73 3.17 0.85 0.95 0.0884 10.79 16.06 8
5 5.56 5.05 0.26 24.30 20.00 4.30 0.69 0.76 0.1389 14.61 21.74 8
6 6.63 6.07 0.28 34.47 28.89 5.58 0.58 0.63 0.2006 18.97 28.23 8
8 8.63 7.98 0.32 58.42 50.02 8.40 0.44 0.48 0.3552 28.55 42.49 8
10 10.75 10.02 0.37 90.76 78.85 11.90 0.36 0.38 0.5476 40.48 60.24 8
12 12.75 11.94 0.41 127.64 111.90 15.74 0.30 0.32 0.7763 53.60 79.77 8
14 14.00 13.13 0.44 153.94 135.30 18.64 0.27 0.28 0.9354 63.00 93.75 8
16 16.00 15.00 0.50 201.05 176.70 24.35 0.24 0.25 1.2230 78.00 116.08 8
18 18.00 16.88 0.56 254.85 224.00 30.85 0.21 0.23 1.5550 105.00 156.26 8
20 20.00 18.81 0.59 314.15 278.00 36.15 0.19 0.20 1.9260 123.00 183.05 8
24 24.00 22.63 0.69 452.40 402.10 50.30 0.16 0.17 2.7930 171.00 254.48 8

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