CHS 323.9×16

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, t16 mm0.629921 in
Outside diameter323.9 mm12.752 in
Inside diameter291.9 mm11.4921 in

Bending about the major axis

PropertyMetricImperial
Second moment of area, Iₓ184,000,000 mm⁴442.0618 in⁴
Elastic modulus, Sₓ1,140,000 mm³69.5671 in³
Plastic modulus, Zₓ1,520,000 mm³92.7561 in³
Radius of gyration, rₓ109 mm4.2913 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_y184,000,000 mm⁴442.0618 in⁴
Elastic modulus, S_y1,140,000 mm³69.5671 in³
Plastic modulus, Z_y1,520,000 mm³92.7561 in³
Radius of gyration, r_y109 mm4.2913 in

Torsion and warping

PropertyMetricImperial
Torsion constant, J368,000,000 mm⁴884.1235 in⁴

Mass

PropertyMetricImperial
Mass per metre121 kg/m81.3082 lb/ft
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