Dimensions - Cold-Formed Circular Hollow Sections

Welcome to our Cold-Formed Circular Hollow Section dimensions page! Here you'll find dimensions for all UK Cold-Formed Circular Hollow Section steel sections described by the Steelwork Design Guide to BS5950-1:2000, Volume 1, Section Properties, Member Capacities, 7th Edition (also known as The Blue Book). Sort the table below according to any property and select a CAD file to download using the reference links in the left-most column. You can also purchase all our CAD data in one easy download, containing the sections as individual files and AutoCAD Design Center files or Microstation cel libraries - just click on the Shop button in the navigation above.

Section Reference Outside Diameter Thickness Mass per Metre Area of Section
  D
mm
t
mm
kg/m A
cm2
33.7x3.0 33.7 3 2.27 2.89
42.4x4.0 42.4 4 3.79 4.83
48.3x3.0 48.3 3 3.35 4.27
48.3x3.5 48.3 3.5 3.87 4.93
48.3x4.0 48.3 4 4.37 5.57
60.3x3.0 60.3 3 4.24 5.4
60.3x4.0 60.3 4 5.55 7.07
76.1x3.0 76.1 3 5.41 6.89
76.1x4.0 76.1 4 7.11 9.06
88.9x3.0 88.9 3 6.36 8.1
88.9x3.5 88.9 3.5 7.37 9.39
88.9x4.0 88.9 4 8.38 10.7
88.9x5.0 88.9 5 10.3 13.2
88.9x6.3 88.9 6.3 12.8 16.3
114.3x3.0 114.3 3 8.23 10.5
114.3x3.5 114.3 3.5 9.56 12.2
114.3x4.0 114.3 4 10.9 13.9
114.3x5.0 114.3 5 13.5 17.2
114.3x6.0 114.3 6 16 20.4
139.7x4.0 139.7 4 13.4 17.1
139.7x5.0 139.7 5 16.6 21.2
139.7x6.0 139.7 6 19.8 25.2
139.7x8.0 139.7 8 26 33.1
139.7x10.0 139.7 10 32 40.7
168.3x4.0 168.3 4 16.2 20.6
168.3x5.0 168.3 5 20.1 25.7
168.3x6.0 168.3 6 24 30.6
168.3x8.0 168.3 8 31.6 40.3
168.3x10.0 168.3 10 39 49.7
168.3x12.5 168.3 12.5 48 61.2
193.7x4.0 193.7 4 18.7 23.8
193.7x4.5 193.7 4.5 21 26.7
193.7x5.0 193.7 5 23.3 29.6
193.7x6.0 193.7 6 27.8 35.4
193.7x8.0 193.7 8 36.6 46.7
193.7x10.0 193.7 10 45.3 57.7
193.7x12.5 193.7 12.5 55.9 71.2
219.1x4.5 219.1 4.5 23.8 30.3
219.1x5.0 219.1 5 26.4 33.6
219.1x6.0 219.1 6 31.5 40.2
219.1x8.0 219.1 8 41.6 53.1
219.1x10.0 219.1 10 51.6 65.7
219.1x12.0 219.1 12 61.3 78.1
219.1x12.5 219.1 12.5 63.7 81.1
219.1x16.0 219.1 16 80.1 102
244.5x5.0 244.5 5 29.5 37.6
244.5x6.0 244.5 6 35.3 45
244.5x8.0 244.5 8 46.7 59.4
244.5x10.0 244.5 10 57.8 73.7
244.5x12.0 244.5 12 68.8 87.7
244.5x12.5 244.5 12.5 71.5 91.1
244.5x16.0 244.5 16 90.2 115
273.0x5.0 273 5 33 42.1
273.0x6.0 273 6 39.5 50.3
273.0x8.0 273 8 52.3 66.6
273.0x10.0 273 10 64.9 82.6
273.0x12.0 273 12 77.2 98.4
273.0x12.5 273 12.5 80.3 102
273.0x16.0 273 16 101 129
323.9x5.0 323.9 5 39.3 50.1
323.9x6.0 323.9 6 47 59.9
323.9x8.0 323.9 8 62.3 79.4
323.9x10.0 323.9 10 77.4 98.6
323.9x12.0 323.9 12 92.3 118
323.9x12.5 323.9 12.5 96 122
323.9x16.0 323.9 16 121 155
355.6x5.0 355.6 5 43.2 55.1
355.6x6.0 355.6 6 51.7 65.9
355.6x8.0 355.6 8 68.6 87.4
355.6x10.0 355.6 10 85.2 109
355.6x12.0 355.6 12 102 130
355.6x12.5 355.6 12.5 106 135
355.6x16.0 355.6 16 134 171
406.4x6.0 406.4 6 59.2 75.5
406.4x8.0 406.4 8 78.6 100
406.4x10.0 406.4 10 97.8 125
406.4x12.0 406.4 12 117 149
406.4x12.5 406.4 12.5 121 155
406.4x16.0 406.4 16 154 196
457.0x6.0 457 6 66.7 85
457.0x8.0 457 8 88.6 113
457.0x10.0 457 10 110 140
457.0x12.0 457 12 132 168
457.0x12.5 457 12.5 137 175
457.0x16.0 457 16 174 222
508.0x6.0 508 6 74.3 94.6
508.0x8.0 508 8 98.6 126
508.0x10.0 508 10 123 156
508.0x12.0 508 12 147 187
508.0x12.5 508 12.5 153 195
508.0x16.0 508 16 194 247