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.

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Section ReferenceRatio for Local BucklingSecond Moment of AreaRadius of GyrationElastic ModulusPlastic ModulusTorsional ConstantsSurface Area
        Per MetrePer Tonne
 d/t(1)I
cm4
r
cm
Z
cm3
S
cm3
J
cm4
C
cm3
m2m2
25x25x2.07.51.480.9241.191.472.531.80.09368.3
25x25x2.551.690.8991.351.712.972.070.09155.7
25x25x3.03.331.840.8741.471.913.332.270.0947.4
30x30x2.573.161.12.12.615.43.20.11154.8
30x30x3.053.51.082.342.966.153.580.1146.5
40x40x2.0156.941.543.474.1311.35.230.15366.4
40x40x2.5118.221.514.114.9713.66.210.15153.7
40x40x3.08.339.321.494.665.7215.87.070.1545.3
40x40x4.0511.11.445.547.0119.48.480.14634.8
50x50x2.51516.91.926.788.0727.510.20.19153.1
50x50x3.011.719.51.97.799.3932.111.80.1944.7
50x50x4.07.523.71.859.4911.740.414.40.18634.2
50x50x5.05271.810.813.747.516.60.18327.9
60x60x3.01535.12.3111.71457.117.70.2344.3
60x60x4.01043.62.2614.517.672.6220.22633.7
60x60x5.0750.52.2116.820.986.425.60.22327.4
70x70x2.52349.42.7414.116.578.521.20.27152.5
70x70x3.018.357.52.7116.419.492.424.70.2744
70x70x3.51565.12.6918.622.2106280.26838
70x70x4.012.572.12.6720.624.811931.10.26633.4
70x70x5.0984.62.6224.229.614236.70.26327.1
80x80x3.021.787.83.122225.8140330.3143.8
80x80x3.517.999.83.12529.516137.60.30837.7
80x80x4.0151113.0727.833.118041.80.30633.2
80x80x5.0111313.0332.939.721849.70.30326.9
80x80x6.08.331492.9837.345.825256.60.29922.7
90x90x3.0251273.5328.33320142.50.3543.6
90x90x3.520.71453.5132.237.923248.50.34837.6
90x90x4.017.51623.483642.626154.20.34633
90x90x5.0131933.4342.951.431664.70.34326.7
90x90x6.0102203.394959.536874.20.33922.5
100x100x3.028.31773.9435.441.227953.20.3943.5
100x100x4.0202263.8945.353.336268.10.38632.9
100x100x5.0152713.8454.264.644181.70.38326.6
100x100x6.011.73113.7962.375.151494.10.37922.3
100x100x8.07.53663.6773.291.16451140.36617.1
120x120x4.0254024.716778.36371010.46632.7
120x120x5.0194854.6680.995.47781220.46326.4
120x120x6.0155624.6193.71129131410.45922.1
120x120x8.0106774.4911313811601750.44616.9
120x120x10.077774.3812916213802030.43713.7
140x140x4.0306525.5293.110810201400.54632.6
140x140x5.0237915.4811313212601700.54326.2
140x140x6.018.39205.4313115514801980.53922
140x140x8.012.511305.316119419002480.52616.7
140x140x10.0913105.218723022702910.51713.6
150x150x4.032.58085.9310812512701620.58632.5
150x150x5.0259825.8913115315501970.58326.2
150x150x6.02011505.8415318018302300.57921.9
150x150x8.013.814105.7118822623602890.56616.7
150x150x10.01016505.6122026928403410.55713.5
160x160x4.0359876.3412314315401850.62632.5
160x160x5.02712006.2915017519002260.62326.1
160x160x6.021.714106.2517620622402640.61921.9
160x160x8.01517406.1221826029003340.60616.6
160x160x10.01120506.0225631134903950.59713.4
180x180x5.03117407.1119322427202900.70326.1
180x180x6.02520407.0622626432203400.69921.8
180x180x8.017.525506.9428333641904320.68616.5
180x180x10.01330206.8433540450705150.67713.4
180x180x12.01033206.6836945458705840.65811.3
180x180x12.59.434106.6537846760506000.65610.8
200x200x5.03524107.9324127937603620.78326
200x200x6.028.328307.8828333044604260.77921.8
200x200x8.02035707.7635742158205440.76616.5
200x200x10.01542507.6542550870706510.75713.3
200x200x12.011.747307.547357682307430.73811.2
200x200x12.51148607.4748659485007650.73610.8
250x250x6.036.756709.9245452488406810.97921.6
250x250x8.026.372309.8578676116008780.96616.3
250x250x10.02087109.76978221420010600.95713.2
250x250x12.015.898609.557899441670012300.93811.1
250x250x12.515102009.528139751730012700.93610.6
300x300x6.045996012664764154009971.1821.6
300x300x8.032.51280011.88539912030012901.1716.3
300x300x10.0251550011.7104012102500015701.1613.1
300x300x12.0201780011.6118014002950018301.1411
300x300x12.5191830011.6122014503060018901.1410.6
350x350x8.038.82070013.9118013703260017901.3716.2
350x350x10.0302520013.8144016804010021801.3613
350x350x12.024.22910013.6166019504760025501.3410.9
350x350x12.5233000013.6172020204940026401.3410.5
400x400x8.0453130015.9156018004890023601.5716.2
400x400x10.0353820015.8191022106040028901.5613
400x400x12.028.34430015.7222025907180034001.5410.9
400x400x12.5274590015.7229026807460035201.5410.5