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.

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Section ReferenceRatio for Local BucklingSecond Moment of AreaRadius of GyrationElastic ModulusPlastic ModulusTorsional ConstantsSurface Area
        Per MetrePer Tonne
 D/tI
cm4
r
cm
Z
cm3
S
cm3
J
cm4
C
cm3
m2m2
33.7x3.011.23.441.092.042.846.884.080.10646.6
42.4x4.010.68.991.364.245.92188.480.13335.2
48.3x3.016.1111.614.556.17229.110.15245.3
48.3x3.513.812.41.595.157.0424.910.30.15239.2
48.3x4.012.113.81.575.77.8727.511.40.15234.7
60.3x3.020.122.22.037.379.8644.414.70.18944.7
60.3x4.015.128.229.3412.756.318.70.18934.1
76.1x3.025.446.12.5912.11692.224.20.23944.2
76.1x4.01959.12.5515.520.8118310.23933.6
88.9x3.029.674.83.0416.822.115033.60.27943.9
88.9x3.525.485.73.0219.325.517138.60.27937.9
88.9x4.022.296.3321.728.919343.30.27933.3
88.9x5.017.81162.9726.235.223352.40.27927
88.9x6.314.11402.9331.543.128063.10.27921.8
114.3x3.038.11633.9428.437.232556.90.35943.6
114.3x3.532.71873.9232.74337465.50.35937.5
114.3x4.028.62113.936.948.742273.90.35933
114.3x5.022.92573.874559.851489.90.35926.6
114.3x6.019.13003.8352.570.46001050.35922.4
139.7x4.034.93934.856.273.77861120.43932.8
139.7x5.027.94814.7768.890.89611380.43926.4
139.7x6.023.35644.7380.810711301620.43922.2
139.7x8.017.57204.6610313914402060.43916.9
139.7x10.0148624.612316917202470.43913.7
168.3x4.042.16975.8182.810813901660.52932.6
168.3x5.033.78565.7810213317102030.52926.3
168.3x6.028.110105.7412015820202400.52922
168.3x8.02113005.6715420626003080.52916.7
168.3x10.016.815605.6118625131303720.52913.5
168.3x12.513.518705.5322230437404440.52911
193.7x4.048.410706.7111114421502220.60932.5
193.7x4.54312006.6912416124002470.60929
193.7x5.038.713206.6713617826402730.60926.2
193.7x6.032.315606.6416121131203220.60921.9
193.7x8.024.220206.5720827640304160.60916.6
193.7x10.019.424406.525233848805040.60913.4
193.7x12.515.529306.4230341158706060.60910.9
219.1x4.548.717507.5915920734903190.68828.9
219.1x5.043.819307.5717622938603520.68826.1
219.1x6.036.522807.5420827345604170.68821.8
219.1x8.027.429607.4727035759205400.68816.5
219.1x10.021.936007.432843872006570.68813.3
219.1x12.018.342007.3338351584007670.68811.2
219.1x12.517.543507.3239753486907930.68810.8
219.1x16.013.753007.2483661106009670.6888.59
244.5x5.048.927008.4722128754004410.76826
244.5x6.040.832008.4326234164005230.76821.8
244.5x8.030.641608.3734044883206810.76816.5
244.5x10.024.550708.3415550101008300.76813.3
244.5x12.020.459408.23486649119009720.76811.2
244.5x12.519.661508.215036731230010100.76810.7
244.5x16.015.375308.16168371510012300.7688.52
273.0x5.054.637809.4827735975605540.85826
273.0x6.045.544909.4432942889706570.85821.7
273.0x8.034.158509.37429562117008570.85816.4
273.0x10.027.371509.315246921430010500.85813.2
273.0x12.022.884009.246158181680012300.85811.1
273.0x12.521.887009.226378491740012700.85810.7
273.0x16.017.1107009.178410602140015700.8588.46
323.9x5.064.8637011.3393509127007871.0225.9
323.9x6.054757011.2468606151009351.0221.6
323.9x8.040.5991011.26127991980012201.0216.3
323.9x10.032.41220011.17519862430015001.0213.1
323.9x12.027143001188411702860017701.0211
323.9x12.525.9148001191712102970018301.0210.6
323.9x16.020.21840010.9114015203680022701.028.38
355.6x5.071.1846012.4476615169009521.1225.8
355.6x6.059.31010012.45667332010011301.1221.6
355.6x8.044.51320012.37429672640014901.1216.3
355.6x10.035.61620012.291212003240018301.1213.1
355.6x12.029.61910012.2108014203830021501.1211
355.6x12.528.41990012.1112014703970022301.1210.6
355.6x16.022.22470012139018504930027701.128.34
406.4x6.067.71510014.27459623030014901.2821.5
406.4x8.050.81990014.197812703970019601.2816.2
406.4x10.040.62450014121015704900024101.2813.1
406.4x12.033.92890014142018705790028501.2810.9
406.4x12.532.53000013.9148019406010029601.2810.5
406.4x16.025.43740013.8184024407490036901.288.29
457.0x6.076.22160015.994612204320018901.4421.5
457.0x8.057.12840015.9125016105690024901.4416.2
457.0x10.045.73510015.8154020007020030701.4413
457.0x12.038.14160015.7182023808310036401.4410.9
457.0x12.536.64310015.7189024708630037801.4410.5
457.0x16.028.65400015.62360311010800047201.448.25
508.0x6.084.72980017.7117015105960023501.621.5
508.0x8.063.53930017.7155020007860030901.616.2
508.0x10.050.84850017.6191024809700038201.613
508.0x12.042.35750017.52270295011500045301.610.9
508.0x12.540.65980017.52350307012000047101.610.4
508.0x16.031.87490017.42950387015000059001.68.22