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Steel Designers' Manual - 6th Edition (2003)
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Dimensions and properties
COLD-FORMED SQUARE HOLLOW SECTIONS
DIMENSIONS AND PROPERTIES Section Designation Size
Mass per Metre
Area of Section
Thickness A cm2
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
1.74 2.09 2.41
7.50 5.00 3.33
1.48 1.69 1.84
0.924 0.899 0.874
1.19 1.35 1.47
1.47 1.71 1.91
2.53 2.97 3.33
1.80 2.07 2.27
0.0931 0.0914 0.0897
68.5 55.7 47.5
1.68 2.03 2.36
2.14 2.59 3.01
10.0 7.00 5.00
2.72 3.16 3.50
1.13 1.10 1.08
1.81 2.10 2.34
2.21 2.61 2.96
4.54 5.40 6.15
2.75 3.20 3.58
0.113 0.111 0.110
67.3 54.7 46.6
‡ ‡ ‡ ‡
2.31 2.82 3.30 4.20
2.94 3.59 4.21 5.35
15.0 11.0 8.33 5.00
6.94 8.22 9.32 11.1
1.54 1.51 1.49 1.44
3.47 4.11 4.66 5.54
4.13 4.97 5.72 7.01
11.3 13.6 15.8 19.4
5.23 6.21 7.07 8.48
0.153 0.151 0.150 0.146
66.2 53.5 45.5 34.8
‡ ‡ ‡ ‡ ‡
2.93 3.60 4.25 5.45 6.56
3.74 4.59 5.41 6.95 8.36
20.0 15.0 11.7 7.50 5.00
14.1 16.9 19.5 23.7 27.0
1.95 1.92 1.90 1.85 1.80
5.66 6.78 7.79 9.49 10.8
6.66 8.07 9.39 11.7 13.7
22.6 27.5 32.1 40.4 47.5
8.51 10.2 11.8 14.4 16.6
0.193 0.191 0.190 0.186 0.183
65.9 53.1 44.7 34.1 27.9
60 x 60
3.0 ‡ 4.0 ‡ 5.0 ‡
5.19 6.71 8.13
6.61 8.55 10.4
15.0 10.0 7.00
35.1 43.6 50.5
2.31 2.26 2.21
11.7 14.5 16.8
14.0 17.6 20.9
57.1 72.6 86.4
17.7 22.0 25.6
0.230 0.226 0.223
44.3 33.7 27.4
70 x 70
2.5 3.0 3.5 4.0 5.0
‡ ‡ ‡ ‡ ‡
5.17 6.13 7.06 7.97 9.70
6.59 7.81 8.99 10.1 12.4
23.0 18.3 15.0 12.5 9.00
49.4 57.5 65.1 72.1 84.6
2.74 2.71 2.69 2.67 2.62
14.1 16.4 18.6 20.6 24.2
16.5 19.4 22.2 24.8 29.6
78.5 92.4 106 119 142
21.2 24.7 28.0 31.1 36.7
0.271 0.270 0.268 0.266 0.263
52.4 44.0 38.0 33.4 27.1
80 x 80
3.0 3.5 4.0 5.0 6.0
‡ ‡ ‡ ‡ ‡
7.07 8.16 9.22 11.3 13.2
9.01 10.4 11.7 14.4 16.8
21.7 17.9 15.0 11.0 8.33
87.8 99.8 111 131 149
3.12 3.10 3.07 3.03 2.98
22.0 25.0 27.8 32.9 37.3
25.8 29.5 33.1 39.7 45.8
140 161 180 218 252
33.0 37.6 41.8 49.7 56.6
0.310 0.308 0.306 0.303 0.299
43.8 37.7 33.2 26.8 22.7
90 x 90
3.0 3.5 4.0 5.0 6.0
‡ ‡ ‡ ‡ ‡
8.01 9.26 10.5 12.8 15.1
10.2 11.8 13.3 16.4 19.2
25.0 20.7 17.5 13.0 10.0
127 145 162 193 220
3.53 3.51 3.48 3.43 3.39
28.3 32.2 36.0 42.9 49.0
33.0 37.9 42.6 51.4 59.5
201 232 261 316 368
42.5 48.5 54.2 64.7 74.2
0.350 0.348 0.346 0.343 0.339
43.7 37.6 33.0 26.8 22.5
100 x 100
3.0 4.0 5.0 6.0 8.0
‡ ‡ ‡ ‡ ‡
8.96 11.7 14.4 17.0 21.4
11.4 14.9 18.4 21.6 27.2
28.3 20.0 15.0 11.7 7.50
177 226 271 311 366
3.94 3.89 3.84 3.79 3.67
35.4 45.3 54.2 62.3 73.2
41.2 53.3 64.6 75.1 91.1
279 362 441 514 645
53.2 68.1 81.7 94.1 114
0.390 0.386 0.383 0.379 0.366
43.5 33.0 26.6 22.3 17.1
120 x120
4.0 ‡ 5.0 ‡ 6.0 ‡ 8.0 ‡ 10.0 ‡
14.2 17.5 20.7 26.4 31.8
18.1 22.4 26.4 33.6 40.6
25.0 19.0 15.0 10.0 7.00
402 485 562 677 777
4.71 4.66 4.61 4.49 4.38
67.0 80.9 93.7 113 129
78.3 95.4 112 138 162
637 778 913 1160 1380
101 122 141 175 203
0.466 0.463 0.459 0.446 0.437
32.8 26.5 22.2 16.9 13.7
DxD mm
t mm
kg/m
25 x 25
2.0 ‡ 2.5 ‡ 3.0 ‡
1.36 1.64 1.89
30 x 30
2.0 ‡ 2.5 ‡ 3.0 ‡
40 x 40
2.0 2.5 3.0 4.0
50 x 50
2.0 2.5 3.0 4.0 5.0
‡ Grade S275 not available from some leading producers. Check availability. (1) For local buckling calculation d = D - 5t.