CHS 323.9×5
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 | 5 mm | 0.19685 in |
| Outside diameter | 323.9 mm | 12.752 in |
| Inside diameter | 313.9 mm | 12.3583 in |
Bending about the major axis
| Property | Metric | Imperial |
|---|---|---|
| Second moment of area, Iₓ | 63,700,000 mm⁴ | 153.0399 in⁴ |
| Elastic modulus, Sₓ | 393,000 mm³ | 23.9823 in³ |
| Plastic modulus, Zₓ | 509,000 mm³ | 31.0611 in³ |
| Radius of gyration, rₓ | 113 mm | 4.4488 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 | 63,700,000 mm⁴ | 153.0399 in⁴ |
| Elastic modulus, S_y | 393,000 mm³ | 23.9823 in³ |
| Plastic modulus, Z_y | 509,000 mm³ | 31.0611 in³ |
| Radius of gyration, r_y | 113 mm | 4.4488 in |
Torsion and warping
| Property | Metric | Imperial |
|---|---|---|
| Torsion constant, J | 127,000,000 mm⁴ | 305.1187 in⁴ |
Mass
| Property | Metric | Imperial |
|---|---|---|
| Mass per metre | 39.3 kg/m | 26.4084 lb/ft |