CHS 323.9×12.5

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, t12.5 mm0.492126 in
Outside diameter323.9 mm12.752 in
Inside diameter298.9 mm11.7677 in

Bending about the major axis

PropertyMetricImperial
Second moment of area, Iₓ148,000,000 mm⁴355.5714 in⁴
Elastic modulus, Sₓ917,000 mm³55.9588 in³
Plastic modulus, Zₓ1,210,000 mm³73.8387 in³
Radius of gyration, rₓ110 mm4.3307 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_y148,000,000 mm⁴355.5714 in⁴
Elastic modulus, S_y917,000 mm³55.9588 in³
Plastic modulus, Z_y1,210,000 mm³73.8387 in³
Radius of gyration, r_y110 mm4.3307 in

Torsion and warping

PropertyMetricImperial
Torsion constant, J297,000,000 mm⁴713.5454 in⁴

Mass

PropertyMetricImperial
Mass per metre96 kg/m64.509 lb/ft
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