Cold formed Square Hollow Sections

High strength cold formed hollow sections suitable for construction and mechanical applications where controlled specifications and associated design regulations apply.

Designation Size
B mm x mm
Thickness
T mm
Normal Corner Radius
External ro mm
Normal Corner Radius
External ri mm
Mass per metre
M kg/m
Area of Section
A cm2
Second Moment of
Area Icm4
Radius of Gyration
r cm
Elastic Modulus
Z cm3
Plastic Modulus
S cm3
Torsional Constants Inertia
J cm4
Torsional Constants Modulus
C cm3
Section Surface Area
As m2m
Nominal Length
per Tonne m
Designation Size
B mm x mm
Thickness
T mm
Normal Corner Radius
External ro mm
Normal Corner Radius
External ri mm
Mass per metre
M kg/m
Area of Section
A cm2
Second Moment of
Area I cm4
Radius of Gyration
r cm
Elastic Modulus
Z cm3
Plastic Modulus
S cm3
Torsional Constants Inertia
J cm4
Torsional Constants Modulus
C cm3
Section Surface Area
As m2m
Nominal Length
per Tonne m
20 2 4 2 1.05 1.34 0.692 0.72 0.692 0.877 1.21 1.06 0.0731 953
20 2.5 5 2.5 1.25 1.59 0.766 0.694 0.766 1 1.39 1.19 0.0714 802
25 2 4 2 1.36 1.74 1.48 0.924 1.19 1.47 2.53 1.8 0.0931 733
25 2.5 5 2.5 1.64 2.09 1.69 0.899 1.35 1.71 2.97 2.07 0.0914 610
25 3 6 3 1.89 2.41 1.84 0.874 1.47 1.91 3.33 2.27 0.0897 529
30 2 4 2 1.68 2.14 2.72 1.13 1.81 2.21 4.54 2.75 0.113 596
30 2.5 5 2.5 2.03 2.59 3.16 1.1 2.1 2.61 5.4 3.2 0.111 492
30 3 6 3 2.36 3.01 3.5 1.08 2.34 2.96 6.15 3.58 0.11 423
40 2 4 2 2.31 2.94 6.94 1.54 3.47 4.13 11.3 5.23 0.153 434
40 2.5 5 2.5 2.82 3.59 8.22 1.51 4.11 4.97 13.6 6.21 0.151 355
40 3 6 3 3.3 4.21 9.32 1.49 4.66 5.72 15.8 7.07 0.15 303
40 4 8 4 4.2 5.35 11.1 1.44 5.54 7.01 19.4 8.48 0.146 238
50 2 4 2 2.93 3.74 14.1 1.95 5.66 6.66 22.6 8.51 0.193 341
50 2.5 5 2.5 3.6 4.59 16.9 1.92 6.78 8.07 27.5 10.2 0.191 278
50 3 6 3 4.25 5.41 19.5 1.9 7.79 9.39 32.1 11.8 0.19 236
50 4 8 4 5.45 6.95 23.7 1.85 9.49 11.7 40.4 14.4 0.186 183
50 5 10 5 6.56 8.36 27 1.8 10.8 13.7 47.5 16.6 0.183 152
60 2 4 2 3.56 4.54 25.1 2.35 8.38 9.79 39.8 12.6 0.233 281
60 2.5 5 2.5 4.39 5.59 30.3 2.33 10.1 11.9 48.7 15.2 0.231 228
60 3 6 3 5.19 6.61 35.1 2.31 11.7 14 57.1 17.7 0.23 193
60 4 8 4 6.71 8.55 43.6 2.26 14.5 17.6 72.6 22 0.226 149
60 5 10 5 8.13 10.4 50.5 2.21 16.8 20.9 86.4 25.6 0.223 123
60 6 12 6 9.45 12 56.1 2.16 18.7 23.7 98.4 28.6 0.219 106
60 6.3 15.75 9.45 9.55 12.2 54.4 2.11 18.1 23.4 100 28.8 0.213 105
70 2.5 5 2.5 5.17 6.59 49.4 2.74 14.1 16.5 78.5 21.2 0.271 193
70 3 6 3 6.13 7.81 57.5 2.71 16.4 19.4 92.4 24.7 0.27 163
70 3.6 7.2 3.6 7.24 9.23 66.5 2.69 19 22.7 108 28.7 0.268 138
70 4 8 4 7.97 10.1 72.1 2.67 20.6 24.8 119 31.1 0.266 126
70 5 10 5 9.7 12.4 84.6 2.62 24.2 29.6 142 36.7 0.263 103
70 6 12 6 11.3 14.4 95.2 2.57 27.2 33.8 163 41.4 0.259 88.3
70 6.3 15.75 9.45 11.5 14.7 93.8 2.53 26.8 33.8 168 42.1 0.253 86.7
80 3 6 3 7.07 9.01 87.8 3.12 22 25.8 140 33 0.31 141
80 3.6 7.2 3.6 8.37 10.7 102 3.09 25.5 30.2 165 38.4 0.308 119
80 4 8 4 9.22 11.7 111 3.07 27.8 33.1 180 41.8 0.306 108
80 5 10 5 11.3 14.4 131 3.03 32.9 39.7 218 49.7 0.303 88.7
80 6 12 6 13.2 16.8 149 2.98 37.3 45.8 252 56.6 0.299 75.7
80 6.3 15.75 9.45 13.5 17.2 149 2.94 37.1 46.1 261 57.9 0.293 74
80 8 20 12 16.4 20.8 168 2.84 42.1 53.9 307 66.6 0.286 61.1
90 3 6 3 8.01 10.2 127 3.53 28.3 33 201 42.5 0.35 125
90 3.6 7.2 3.6 9.5 12.1 149 3.5 33 38.9 238 49.6 0.348 105
90 4 8 4 10.5 13.3 162 3.48 36 42.6 261 54.2 0.346 95.4
90 5 10 5 12.8 16.4 193 3.43 42.9 51.4 316 64.7 0.343 77.9
90 6 12 6 15.1 19.2 220 3.39 49 59.5 368 74.2 0.339 66.2
90 6.3 15.75 9.45 15.5 19.7 221 3.35 49.1 60.3 382 76.2 0.333 64.6
90 8 20 12 18.9 24 255 3.25 56.6 71.3 456 88.8 0.326 53
100 3 6 3 8.96 11.4 177 3.94 35.4 41.2 279 53.2 0.39 112
100 4 8 4 11.7 14.9 226 3.89 45.3 53.3 362 68.1 0.386 85.2
100 5 10 5 14.4 18.4 271 3.84 54.2 64.6 441 81.7 0.383 69.4
100 6 12 6 17 21.6 311 3.79 62.3 75.1 514 94.1 0.379 58.9
100 6.3 15.75 9.45 17.5 22.2 314 3.76 62.8 76.4 536 97 0.373 57.3
100 8 20 12 21.4 27.2 366 3.67 73.2 91.1 645 114 0.366 46.8
100 10 25 15 25.6 32.6 411 3.55 82.2 105 750 130 0.357 39.1
100 12 36 24 28.3 36.1 408 3.36 81.6 110 794 136 0.338 35.3
100 12.5 37.5 25 29.1 37 410 3.33 82.1 111 804 137 0.336 34.4
120 3 6 3 10.8 13.8 312 4.76 52.1 60.2 488 78.2 0.47 92.3
120 4 8 4 14.2 18.1 402 4.71 67 78.3 637 101 0.466 70.2
120 5 10 5 17.5 22.4 485 4.66 80.9 95.4 778 122 0.463 57
120 6 12 6 20.7 26.4 562 4.61 93.7 112 913 141 0.459 48.2
120 6.3 15.75 9.45 21.4 27.3 572 4.58 95.3 114 955 146 0.453 46.7
120 8 20 12 26.4 33.6 677 4.49 113 138 1163 175 0.446 37.9
120 10 25 15 31.8 40.6 777 4.38 129 162 1376 203 0.437 31.4
120 12 36 24 35.8 45.7 806 4.2 134 174 1518 219 0.418 27.9
120 12.5 37.5 25 36.9 47 817 4.17 136 178 1551 223 0.416 27.1
140 4 8 4 16.8 21.3 652 5.52 93.1 108 1023 140 0.546 59.7
140 5 10 5 20.7 26.4 791 5.48 113 132 1256 170 0.543 48.3
140 6 12 6 24.5 31.2 920 5.43 131 155 1479 198 0.539 40.8
140 6.3 15.75 9.45 25.4 32.3 941 5.39 134 160 1550 205 0.533 39.4
140 8 20 12 31.4 40 1127 5.3 161 194 1901 248 0.526 31.8
140 10 25 15 38.1 48.6 1312 5.2 187 230 2274 291 0.517 26.2
140 12 36 24 43.4 55.3 1398 5.03 200 253 2567 322 0.498 23.1
140 12.5 37.5 25 44.8 57 1425 5 204 259 2634 329 0.496 22.3
150 4 8 4 18 22.9 808 5.93 108 125 1265 162 0.586 55.5
150 5 10 5 22.3 28.4 982 5.89 131 153 1554 197 0.583 44.9
150 6 12 6 26.4 33.6 1146 5.84 153 180 1833 230 0.579 37.9
150 6.3 15.75 9.45 27.4 34.8 1174 5.8 156 185 1922 239 0.573 36.6
150 8 20 12 33.9 43.2 1412 5.71 188 226 2364 289 0.566 29.5
150 10 25 15 41.3 52.6 1653 5.61 220 269 2839 341 0.557 24.2
150 12 36 24 47.1 60.1 1780 5.44 237 298 3231 380 0.538 21.2
150 12.5 37.5 25 48.7 62 1817 5.41 242 306 3321 389 0.536 20.5
150 16 48 32 58.7 74.8 2009 5.18 268 351 3830 440 0.518 17
160 4 8 4 19.3 24.5 987 6.34 123 143 1541 185 0.626 51.9
160 5 10 5 23.8 30.4 1202 6.29 150 175 1896 226 0.623 42
160 6 12 6 28.3 36 1405 6.25 176 206 2239 264 0.619 35.4
160 6.3 15.75 9.45 29.3 37.4 1442 6.21 180 213 2349 275 0.613 34.1
160 8 20 12 36.5 46.4 1741 6.12 218 260 2897 334 0.606 27.4
160 10 25 15 44.4 56.6 2048 6.02 256 311 3490 395 0.597 22.5
160 12 36 24 50.9 64.9 2224 5.86 278 346 3997 443 0.578 19.6
160 12.5 37.5 25 52.6 67 2275 5.83 284 356 4114 455 0.576 19
160 16 48 32 63.7 81.2 2546 5.6 318 413 4799 520 0.558 15.7
180 4 8 4 21.8 27.7 1422 7.16 158 182 2210 237 0.706 45.9
180 5 10 5 27 34.4 1737 7.11 193 224 2724 290 0.703 37.1
180 6 12 6 32.1 40.8 2037 7.06 226 264 3223 340 0.699 31.2
180 6.3 15.75 9.45 33.3 42.4 2096 7.03 233 273 3383 354 0.693 30
180 8 20 12 41.5 52.8 2546 6.94 283 336 4189 432 0.686 24.1
180 10 25 15 50.7 64.6 3017 6.84 335 404 5074 515 0.677 19.7
180 12 36 24 58.5 74.5 3322 6.68 369 454 5865 584 0.658 17.1
180 12.5 37.5 25 60.5 77 3406 6.65 378 467 6050 600 0.656 16.5
180 16 48 32 73.8 94 3887 6.43 432 550 7178 698 0.638 13.6
200 4 8 4 24.3 30.9 1968 7.97 197 226 3049 295 0.786 41.2
200 5 10 5 30.1 38.4 2410 7.93 241 279 3763 362 0.783 33.2
200 6 12 6 35.8 45.6 2833 7.88 283 330 4459 426 0.779 27.9
200 6.3 15.75 9.45 37.2 47.4 2922 7.85 292 341 4682 444 0.773 26.8
200 8 20 12 46.5 59.2 3566 7.76 357 421 5815 544 0.766 21.5
200 10 25 15 57 72.6 4251 7.65 425 508 7072 651 0.757 17.6
200 12 36 24 66 84.1 4730 7.5 473 576 8230 743 0.738 15.2
200 12.5 37.5 25 68.3 87 4859 7.47 486 594 8502 765 0.736 14.6
200 16 48 32 83.8 107 5625 7.26 562 706 10210 901 0.718 11.9
220 5 10 5 33.2 42.4 3238 8.74 294 340 5038 442 0.863 30.1
220 6 12 6 39.6 50.4 3813 8.7 347 402 5976 521 0.859 25.3
220 6.3 15.75 9.45 41.2 52.5 3940 8.66 358 417 6277 543 0.853 24.3
220 8 20 12 51.5 65.6 4828 8.58 439 516 7815 668 0.846 19.4
220 10 25 15 63.2 80.6 5782 8.47 526 625 9533 804 0.837 15.8
220 12 36 24 73.5 93.7 6487 8.32 590 712 11149 922 0.818 13.6
220 12.5 37.5 25 76.2 97 6674 8.29 607 735 11530 951 0.816 13.1
220 16 48 32 93.9 120 7812 8.08 710 881 13971 1129 0.798 10.7
250 5 10 5 38 48.4 4805 9.97 384 442 7443 577 0.983 26.3
250 6 12 6 45.2 57.6 5672 9.92 454 524 8843 681 0.979 22.1
250 6.3 15.75 9.45 47.1 60 5873 9.89 470 544 9290 711 0.973 21.2
250 8 20 12 59.1 75.2 7229 9.8 578 676 11598 878 0.966 16.9
250 10 25 15 72.7 92.6 8707 9.7 697 822 14197 1062 0.957 13.8
250 12 36 24 84.8 108 9859 9.55 789 944 16691 1226 0.938 11.8
250 12.5 37.5 25 88 112 10161 9.52 813 975 17283 1266 0.936 11.4
250 16 48 32 109 139 12047 9.32 964 1180 21146 1520 0.918 9.18
260 6 12 6 47.1 60 6405 10.3 493 569 9970 739 1.02 21.2
260 6.3 15.75 9.45 49.1 62.6 6635 10.3 510 591 10475 772 1.01 20.4
260 8 20 12 61.6 78.4 8178 10.2 629 734 13087 955 1.01 16.2
260 10 25 15 75.8 96.6 9865 10.1 759 894 16035 1156 0.997 13.2
260 12 36 24 88.6 113 11200 9.96 862 1028 18878 1337 0.978 11.3
260 12.5 37.5 25 91.9 117 11548 9.93 888 1063 19553 1381 0.976 10.9
260 16 48 32 114 145 13739 9.73 1057 1289 23986 1663 0.958 8.77
300 6 12 6 54.7 69.6 9964 12 664 764 15434 997 1.18 18.3
300 6.3 15.75 9.45 57 72.6 10342 11.9 689 795 16218 1042 1.17 17.5
300 8 20 12 71.6 91.2 12801 11.8 853 991 20312 1293 1.17 14
300 10 25 15 88.4 113 15519 11.7 1035 1211 24966 1572 1.16 11.3
300 12 36 24 104 132 17767 11.6 1184 1402 29514 1829 1.14 9.65
300 12.5 37.5 25 108 137 18348 11.6 1223 1451 30601 1892 1.14 9.3
300 16 48 32 134 171 22076 11.4 1472 1774 37837 2299 1.12 7.46
350 8 20 12 84.2 107 20681 13.9 1182 1366 32557 1787 1.37 11.9
350 10 25 15 104 133 25189 13.8 1439 1675 40127 2182 1.36 9.61
350 12 36 24 123 156 29054 13.6 1660 1949 47598 2552 1.34 8.16
350 12.5 37.5 25 127 162 30045 13.6 1717 2020 49393 2642 1.34 7.86
350 16 48 32 159 203 36511 13.4 2086 2488 61481 3238 1.32 6.28
400 10 25 15 120 153 38216 15.8 1911 2214 60431 2892 1.56 8.35
400 12 36 24 141 180 44319 15.7 2216 2587 71843 3395 1.54 7.07
400 12.5 37.5 25 147 187 45877 15.7 2294 2683 74598 3518 1.54 6.81
400 16 48 32 184 235 56154 15.5 2808 3322 93279 4336 1.52 5.43
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