CHS 323.9×6.3
Circular hollow sections from Eurocode 3 UK National Annex and ArcelorMittal Sections 2026-1.
Outline drawn from the published dimensions. Fillets and root radii are not shown.
Dimensions
| Property | Metric | Imperial |
|---|---|---|
| Thickness, t | 6.3 mm | 0.248031 in |
| Outside diameter | 323.9 mm | 12.752 in |
| Inside diameter | 311.3 mm | 12.2559 in |
Bending about the major axis
| Property | Metric | Imperial |
|---|---|---|
| Second moment of area, Iₓ | 79,300,000 mm⁴ | 190.519 in⁴ |
| Elastic modulus, Sₓ | 490,000 mm³ | 29.9016 in³ |
| Plastic modulus, Zₓ | 636,000 mm³ | 38.8111 in³ |
| Radius of gyration, rₓ | 112 mm | 4.4094 in |
| Distance to top fibre | 161.95 mm | 6.376 in |
| Distance to bottom fibre | 161.95 mm | 6.376 in |
Bending about the minor axis
| Property | Metric | Imperial |
|---|---|---|
| Second moment of area, I_y | 79,300,000 mm⁴ | 190.519 in⁴ |
| Elastic modulus, S_y | 490,000 mm³ | 29.9016 in³ |
| Plastic modulus, Z_y | 636,000 mm³ | 38.8111 in³ |
| Radius of gyration, r_y | 112 mm | 4.4094 in |
Torsion and warping
| Property | Metric | Imperial |
|---|---|---|
| Torsion constant, J | 159,000,000 mm⁴ | 381.999 in⁴ |
Mass
| Property | Metric | Imperial |
|---|---|---|
| Mass per metre | 49.3 kg/m | 33.1281 lb/ft |