Properties - Cold-Formed Circular Hollow Sections

Welcome to our Cold-Formed Circular Hollow Section properties page! Here you'll find properties 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.

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Section Reference Ratio for Local Buckling Second Moment of Area Radius of Gyration Elastic Modulus Plastic Modulus Torsional Constants Surface Area
                Per Metre Per Tonne
  D/t I
cm4
r
cm
Z
cm3
S
cm3
J
cm4
C
cm3
m2 m2
33.7x3.0 11.2 3.44 1.09 2.04 2.84 6.88 4.08 0.106 46.6
42.4x4.0 10.6 8.99 1.36 4.24 5.92 18 8.48 0.133 35.2
48.3x3.0 16.1 11 1.61 4.55 6.17 22 9.11 0.152 45.3
48.3x3.5 13.8 12.4 1.59 5.15 7.04 24.9 10.3 0.152 39.2
48.3x4.0 12.1 13.8 1.57 5.7 7.87 27.5 11.4 0.152 34.7
60.3x3.0 20.1 22.2 2.03 7.37 9.86 44.4 14.7 0.189 44.7
60.3x4.0 15.1 28.2 2 9.34 12.7 56.3 18.7 0.189 34.1
76.1x3.0 25.4 46.1 2.59 12.1 16 92.2 24.2 0.239 44.2
76.1x4.0 19 59.1 2.55 15.5 20.8 118 31 0.239 33.6
88.9x3.0 29.6 74.8 3.04 16.8 22.1 150 33.6 0.279 43.9
88.9x3.5 25.4 85.7 3.02 19.3 25.5 171 38.6 0.279 37.9
88.9x4.0 22.2 96.3 3 21.7 28.9 193 43.3 0.279 33.3
88.9x5.0 17.8 116 2.97 26.2 35.2 233 52.4 0.279 27
88.9x6.3 14.1 140 2.93 31.5 43.1 280 63.1 0.279 21.8
114.3x3.0 38.1 163 3.94 28.4 37.2 325 56.9 0.359 43.6
114.3x3.5 32.7 187 3.92 32.7 43 374 65.5 0.359 37.5
114.3x4.0 28.6 211 3.9 36.9 48.7 422 73.9 0.359 33
114.3x5.0 22.9 257 3.87 45 59.8 514 89.9 0.359 26.6
114.3x6.0 19.1 300 3.83 52.5 70.4 600 105 0.359 22.4
139.7x4.0 34.9 393 4.8 56.2 73.7 786 112 0.439 32.8
139.7x5.0 27.9 481 4.77 68.8 90.8 961 138 0.439 26.4
139.7x6.0 23.3 564 4.73 80.8 107 1130 162 0.439 22.2
139.7x8.0 17.5 720 4.66 103 139 1440 206 0.439 16.9
139.7x10.0 14 862 4.6 123 169 1720 247 0.439 13.7
168.3x4.0 42.1 697 5.81 82.8 108 1390 166 0.529 32.6
168.3x5.0 33.7 856 5.78 102 133 1710 203 0.529 26.3
168.3x6.0 28.1 1010 5.74 120 158 2020 240 0.529 22
168.3x8.0 21 1300 5.67 154 206 2600 308 0.529 16.7
168.3x10.0 16.8 1560 5.61 186 251 3130 372 0.529 13.5
168.3x12.5 13.5 1870 5.53 222 304 3740 444 0.529 11
193.7x4.0 48.4 1070 6.71 111 144 2150 222 0.609 32.5
193.7x4.5 43 1200 6.69 124 161 2400 247 0.609 29
193.7x5.0 38.7 1320 6.67 136 178 2640 273 0.609 26.2
193.7x6.0 32.3 1560 6.64 161 211 3120 322 0.609 21.9
193.7x8.0 24.2 2020 6.57 208 276 4030 416 0.609 16.6
193.7x10.0 19.4 2440 6.5 252 338 4880 504 0.609 13.4
193.7x12.5 15.5 2930 6.42 303 411 5870 606 0.609 10.9
219.1x4.5 48.7 1750 7.59 159 207 3490 319 0.688 28.9
219.1x5.0 43.8 1930 7.57 176 229 3860 352 0.688 26.1
219.1x6.0 36.5 2280 7.54 208 273 4560 417 0.688 21.8
219.1x8.0 27.4 2960 7.47 270 357 5920 540 0.688 16.5
219.1x10.0 21.9 3600 7.4 328 438 7200 657 0.688 13.3
219.1x12.0 18.3 4200 7.33 383 515 8400 767 0.688 11.2
219.1x12.5 17.5 4350 7.32 397 534 8690 793 0.688 10.8
219.1x16.0 13.7 5300 7.2 483 661 10600 967 0.688 8.59
244.5x5.0 48.9 2700 8.47 221 287 5400 441 0.768 26
244.5x6.0 40.8 3200 8.43 262 341 6400 523 0.768 21.8
244.5x8.0 30.6 4160 8.37 340 448 8320 681 0.768 16.5
244.5x10.0 24.5 5070 8.3 415 550 10100 830 0.768 13.3
244.5x12.0 20.4 5940 8.23 486 649 11900 972 0.768 11.2
244.5x12.5 19.6 6150 8.21 503 673 12300 1010 0.768 10.7
244.5x16.0 15.3 7530 8.1 616 837 15100 1230 0.768 8.52
273.0x5.0 54.6 3780 9.48 277 359 7560 554 0.858 26
273.0x6.0 45.5 4490 9.44 329 428 8970 657 0.858 21.7
273.0x8.0 34.1 5850 9.37 429 562 11700 857 0.858 16.4
273.0x10.0 27.3 7150 9.31 524 692 14300 1050 0.858 13.2
273.0x12.0 22.8 8400 9.24 615 818 16800 1230 0.858 11.1
273.0x12.5 21.8 8700 9.22 637 849 17400 1270 0.858 10.7
273.0x16.0 17.1 10700 9.1 784 1060 21400 1570 0.858 8.46
323.9x5.0 64.8 6370 11.3 393 509 12700 787 1.02 25.9
323.9x6.0 54 7570 11.2 468 606 15100 935 1.02 21.6
323.9x8.0 40.5 9910 11.2 612 799 19800 1220 1.02 16.3
323.9x10.0 32.4 12200 11.1 751 986 24300 1500 1.02 13.1
323.9x12.0 27 14300 11 884 1170 28600 1770 1.02 11
323.9x12.5 25.9 14800 11 917 1210 29700 1830 1.02 10.6
323.9x16.0 20.2 18400 10.9 1140 1520 36800 2270 1.02 8.38
355.6x5.0 71.1 8460 12.4 476 615 16900 952 1.12 25.8
355.6x6.0 59.3 10100 12.4 566 733 20100 1130 1.12 21.6
355.6x8.0 44.5 13200 12.3 742 967 26400 1490 1.12 16.3
355.6x10.0 35.6 16200 12.2 912 1200 32400 1830 1.12 13.1
355.6x12.0 29.6 19100 12.2 1080 1420 38300 2150 1.12 11
355.6x12.5 28.4 19900 12.1 1120 1470 39700 2230 1.12 10.6
355.6x16.0 22.2 24700 12 1390 1850 49300 2770 1.12 8.34
406.4x6.0 67.7 15100 14.2 745 962 30300 1490 1.28 21.5
406.4x8.0 50.8 19900 14.1 978 1270 39700 1960 1.28 16.2
406.4x10.0 40.6 24500 14 1210 1570 49000 2410 1.28 13.1
406.4x12.0 33.9 28900 14 1420 1870 57900 2850 1.28 10.9
406.4x12.5 32.5 30000 13.9 1480 1940 60100 2960 1.28 10.5
406.4x16.0 25.4 37400 13.8 1840 2440 74900 3690 1.28 8.29
457.0x6.0 76.2 21600 15.9 946 1220 43200 1890 1.44 21.5
457.0x8.0 57.1 28400 15.9 1250 1610 56900 2490 1.44 16.2
457.0x10.0 45.7 35100 15.8 1540 2000 70200 3070 1.44 13
457.0x12.0 38.1 41600 15.7 1820 2380 83100 3640 1.44 10.9
457.0x12.5 36.6 43100 15.7 1890 2470 86300 3780 1.44 10.5
457.0x16.0 28.6 54000 15.6 2360 3110 108000 4720 1.44 8.25
508.0x6.0 84.7 29800 17.7 1170 1510 59600 2350 1.6 21.5
508.0x8.0 63.5 39300 17.7 1550 2000 78600 3090 1.6 16.2
508.0x10.0 50.8 48500 17.6 1910 2480 97000 3820 1.6 13
508.0x12.0 42.3 57500 17.5 2270 2950 115000 4530 1.6 10.9
508.0x12.5 40.6 59800 17.5 2350 3070 120000 4710 1.6 10.4
508.0x16.0 31.8 74900 17.4 2950 3870 150000 5900 1.6 8.22