Properties - Cold-Formed Square Hollow Sections

Welcome to our Cold-Formed Square Hollow Section properties page! Here you'll find properties for all UK Cold-Formed Square 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 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(1) I
cm4
r
cm
Z
cm3
S
cm3
J
cm4
C
cm3
m2 m2
25x25x2.0 7.5 1.48 0.924 1.19 1.47 2.53 1.8 0.093 68.3
25x25x2.5 5 1.69 0.899 1.35 1.71 2.97 2.07 0.091 55.7
25x25x3.0 3.33 1.84 0.874 1.47 1.91 3.33 2.27 0.09 47.4
30x30x2.5 7 3.16 1.1 2.1 2.61 5.4 3.2 0.111 54.8
30x30x3.0 5 3.5 1.08 2.34 2.96 6.15 3.58 0.11 46.5
40x40x2.0 15 6.94 1.54 3.47 4.13 11.3 5.23 0.153 66.4
40x40x2.5 11 8.22 1.51 4.11 4.97 13.6 6.21 0.151 53.7
40x40x3.0 8.33 9.32 1.49 4.66 5.72 15.8 7.07 0.15 45.3
40x40x4.0 5 11.1 1.44 5.54 7.01 19.4 8.48 0.146 34.8
50x50x2.5 15 16.9 1.92 6.78 8.07 27.5 10.2 0.191 53.1
50x50x3.0 11.7 19.5 1.9 7.79 9.39 32.1 11.8 0.19 44.7
50x50x4.0 7.5 23.7 1.85 9.49 11.7 40.4 14.4 0.186 34.2
50x50x5.0 5 27 1.8 10.8 13.7 47.5 16.6 0.183 27.9
60x60x3.0 15 35.1 2.31 11.7 14 57.1 17.7 0.23 44.3
60x60x4.0 10 43.6 2.26 14.5 17.6 72.6 22 0.226 33.7
60x60x5.0 7 50.5 2.21 16.8 20.9 86.4 25.6 0.223 27.4
70x70x2.5 23 49.4 2.74 14.1 16.5 78.5 21.2 0.271 52.5
70x70x3.0 18.3 57.5 2.71 16.4 19.4 92.4 24.7 0.27 44
70x70x3.5 15 65.1 2.69 18.6 22.2 106 28 0.268 38
70x70x4.0 12.5 72.1 2.67 20.6 24.8 119 31.1 0.266 33.4
70x70x5.0 9 84.6 2.62 24.2 29.6 142 36.7 0.263 27.1
80x80x3.0 21.7 87.8 3.12 22 25.8 140 33 0.31 43.8
80x80x3.5 17.9 99.8 3.1 25 29.5 161 37.6 0.308 37.7
80x80x4.0 15 111 3.07 27.8 33.1 180 41.8 0.306 33.2
80x80x5.0 11 131 3.03 32.9 39.7 218 49.7 0.303 26.9
80x80x6.0 8.33 149 2.98 37.3 45.8 252 56.6 0.299 22.7
90x90x3.0 25 127 3.53 28.3 33 201 42.5 0.35 43.6
90x90x3.5 20.7 145 3.51 32.2 37.9 232 48.5 0.348 37.6
90x90x4.0 17.5 162 3.48 36 42.6 261 54.2 0.346 33
90x90x5.0 13 193 3.43 42.9 51.4 316 64.7 0.343 26.7
90x90x6.0 10 220 3.39 49 59.5 368 74.2 0.339 22.5
100x100x3.0 28.3 177 3.94 35.4 41.2 279 53.2 0.39 43.5
100x100x4.0 20 226 3.89 45.3 53.3 362 68.1 0.386 32.9
100x100x5.0 15 271 3.84 54.2 64.6 441 81.7 0.383 26.6
100x100x6.0 11.7 311 3.79 62.3 75.1 514 94.1 0.379 22.3
100x100x8.0 7.5 366 3.67 73.2 91.1 645 114 0.366 17.1
120x120x4.0 25 402 4.71 67 78.3 637 101 0.466 32.7
120x120x5.0 19 485 4.66 80.9 95.4 778 122 0.463 26.4
120x120x6.0 15 562 4.61 93.7 112 913 141 0.459 22.1
120x120x8.0 10 677 4.49 113 138 1160 175 0.446 16.9
120x120x10.0 7 777 4.38 129 162 1380 203 0.437 13.7
140x140x4.0 30 652 5.52 93.1 108 1020 140 0.546 32.6
140x140x5.0 23 791 5.48 113 132 1260 170 0.543 26.2
140x140x6.0 18.3 920 5.43 131 155 1480 198 0.539 22
140x140x8.0 12.5 1130 5.3 161 194 1900 248 0.526 16.7
140x140x10.0 9 1310 5.2 187 230 2270 291 0.517 13.6
150x150x4.0 32.5 808 5.93 108 125 1270 162 0.586 32.5
150x150x5.0 25 982 5.89 131 153 1550 197 0.583 26.2
150x150x6.0 20 1150 5.84 153 180 1830 230 0.579 21.9
150x150x8.0 13.8 1410 5.71 188 226 2360 289 0.566 16.7
150x150x10.0 10 1650 5.61 220 269 2840 341 0.557 13.5
160x160x4.0 35 987 6.34 123 143 1540 185 0.626 32.5
160x160x5.0 27 1200 6.29 150 175 1900 226 0.623 26.1
160x160x6.0 21.7 1410 6.25 176 206 2240 264 0.619 21.9
160x160x8.0 15 1740 6.12 218 260 2900 334 0.606 16.6
160x160x10.0 11 2050 6.02 256 311 3490 395 0.597 13.4
180x180x5.0 31 1740 7.11 193 224 2720 290 0.703 26.1
180x180x6.0 25 2040 7.06 226 264 3220 340 0.699 21.8
180x180x8.0 17.5 2550 6.94 283 336 4190 432 0.686 16.5
180x180x10.0 13 3020 6.84 335 404 5070 515 0.677 13.4
180x180x12.0 10 3320 6.68 369 454 5870 584 0.658 11.3
180x180x12.5 9.4 3410 6.65 378 467 6050 600 0.656 10.8
200x200x5.0 35 2410 7.93 241 279 3760 362 0.783 26
200x200x6.0 28.3 2830 7.88 283 330 4460 426 0.779 21.8
200x200x8.0 20 3570 7.76 357 421 5820 544 0.766 16.5
200x200x10.0 15 4250 7.65 425 508 7070 651 0.757 13.3
200x200x12.0 11.7 4730 7.5 473 576 8230 743 0.738 11.2
200x200x12.5 11 4860 7.47 486 594 8500 765 0.736 10.8
250x250x6.0 36.7 5670 9.92 454 524 8840 681 0.979 21.6
250x250x8.0 26.3 7230 9.8 578 676 11600 878 0.966 16.3
250x250x10.0 20 8710 9.7 697 822 14200 1060 0.957 13.2
250x250x12.0 15.8 9860 9.55 789 944 16700 1230 0.938 11.1
250x250x12.5 15 10200 9.52 813 975 17300 1270 0.936 10.6
300x300x6.0 45 9960 12 664 764 15400 997 1.18 21.6
300x300x8.0 32.5 12800 11.8 853 991 20300 1290 1.17 16.3
300x300x10.0 25 15500 11.7 1040 1210 25000 1570 1.16 13.1
300x300x12.0 20 17800 11.6 1180 1400 29500 1830 1.14 11
300x300x12.5 19 18300 11.6 1220 1450 30600 1890 1.14 10.6
350x350x8.0 38.8 20700 13.9 1180 1370 32600 1790 1.37 16.2
350x350x10.0 30 25200 13.8 1440 1680 40100 2180 1.36 13
350x350x12.0 24.2 29100 13.6 1660 1950 47600 2550 1.34 10.9
350x350x12.5 23 30000 13.6 1720 2020 49400 2640 1.34 10.5
400x400x8.0 45 31300 15.9 1560 1800 48900 2360 1.57 16.2
400x400x10.0 35 38200 15.8 1910 2210 60400 2890 1.56 13
400x400x12.0 28.3 44300 15.7 2220 2590 71800 3400 1.54 10.9
400x400x12.5 27 45900 15.7 2290 2680 74600 3520 1.54 10.5