CHS 323.9×5.6

Circular hollow sections from Eurocode 3 UK National Annex and ArcelorMittal Sections 2026-1.

323.9 mm323.9 mm

Outline drawn from the published dimensions. Fillets and root radii are not shown.

Dimensions

PropertyMetricImperial
Thickness, t5.6 mm0.220472 in
Outside diameter323.9 mm12.752 in
Inside diameter312.7 mm12.311 in

Bending about the major axis

PropertyMetricImperial
Second moment of area, Iₓ70,900,000 mm⁴170.3379 in⁴
Elastic modulus, Sₓ438,000 mm³26.7284 in³
Plastic modulus, Zₓ567,000 mm³34.6005 in³
Radius of gyration, rₓ113 mm4.4488 in
Distance to top fibre161.95 mm6.376 in
Distance to bottom fibre161.95 mm6.376 in

Bending about the minor axis

PropertyMetricImperial
Second moment of area, I_y70,900,000 mm⁴170.3379 in⁴
Elastic modulus, S_y438,000 mm³26.7284 in³
Plastic modulus, Z_y567,000 mm³34.6005 in³
Radius of gyration, r_y113 mm4.4488 in

Torsion and warping

PropertyMetricImperial
Torsion constant, J142,000,000 mm⁴341.1564 in⁴

Mass

PropertyMetricImperial
Mass per metre44 kg/m29.5666 lb/ft
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