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.
You can also purchase all our CAD data in one easy download, containing the shapes as individual files or AutoCAD Design Center files! Click here to visit our Shop.
| 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 |