CHS 323.9×7.1
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 | 7.1 mm | 0.279528 in |
| Outside diameter | 323.9 mm | 12.752 in |
| Inside diameter | 309.7 mm | 12.1929 in |
Bending about the major axis
| Property | Metric | Imperial |
|---|---|---|
| Second moment of area, Iₓ | 88,700,000 mm⁴ | 213.1026 in⁴ |
| Elastic modulus, Sₓ | 548,000 mm³ | 33.441 in³ |
| Plastic modulus, Zₓ | 713,000 mm³ | 43.5099 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 | 88,700,000 mm⁴ | 213.1026 in⁴ |
| Elastic modulus, S_y | 548,000 mm³ | 33.441 in³ |
| Plastic modulus, Z_y | 713,000 mm³ | 43.5099 in³ |
| Radius of gyration, r_y | 112 mm | 4.4094 in |
Torsion and warping
| Property | Metric | Imperial |
|---|---|---|
| Torsion constant, J | 177,000,000 mm⁴ | 425.2442 in⁴ |
Mass
| Property | Metric | Imperial |
|---|---|---|
| Mass per metre | 55.5 kg/m | 37.2943 lb/ft |