Pipe Size Chart in mm and Inches

Pipes come in various sizes and they are mandatory for countless jobs and purposes. However, this also suggests that there are a lot of differences and a lot of different pipe sizes. The best thing you can do is take a look at the chart below. We have prepared a full table with all the sizes and all the details. You can see the nominal size of a pipe in inches and in metric values. We will present you KS/JIS standards and also ISO, DIN and ASTM. This refers to the carbon steel pipe. For Cu-Ni Pipe – OD pipes we have prepared an additional section where you can see the inches, metric size and additional European sizes. All the information and details are double-checked and we stay behind our details. There are no errors and there are no possible issues or complications. The chart is based on latest trustworthy values used in various industries.

 

Nominal Size in inchesNominal Size (metric)Carbon steel pipe KS/JIS standardCarbon steel pipe ASTMCarbon steel pipe ISO RuleCarbon steel pipe DINCu-Ni Pipe - OD (metric)Cu-Ni Pipe - OD inchesvarious european sizes
1/8 3.2 10.5 10.3 10.2 10.2
1/4 6.4 13.8 13.7 13.5 13.5
3/8 9.5 17.3 17.1 17.2 17.2
1/2 12.7 21.7 21.3 21.3 21.3
3/4 20 27.2 26.7 26.9 26.9 26.9
1 25 34 33.4 33.7 33.7 30 28.24 33.7
1-1/4 32 42.7 42.2 42.4 42.4 38 34.59 38
1-1/2 40 48.6 48.3 48.3 48.3 44.5 40.94 44.5
50 54
50 57
2 50 60.5 60.3 60.3 60.3 57 54.05 60.3
65 69
2-1/2 65 76.3 73 76.1 76.1 76.1 66.75 76.1
84
3 80 89.1 88.9 88.9 88.9 88.9 79.85 88.9
3-1/2 90 101.6 101.6 101.6
4 100 104
108
4 100 114.3 114.3 114.3 114.3 108 106.27 114.3
129
5 125 139.8 141.3 139.7 139.7 133 131.67 139.7
154
6 150 165.2 168.3 168.3 168.3 159 157.68 168.3
204
8 200 216.3 219.1 219.1 219.1 219 208.48 219
254
267
10 250 267.4 273.1 273 273 267 260.5 273
304
12 300 318.5 323.9 323.9 323.9 323.9 312.11 323.9
14 350 355.6 355.6 355.6 355.6 368 363.72
16 400 406.4 406.4 406.4 406.4 419 414.52
18 450 457.2 457.2 457.2 457.2 457.2 465.32
20 500 508 508 508 508 508 516.94
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