RHS 80×40×4
Rectangular 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 |
|---|---|---|
| Height | 80 mm | 3.1496 in |
| Width | 40 mm | 1.5748 in |
| Thickness, t | 4 mm | 0.15748 in |
Bending about the major axis
| Property | Metric | Imperial |
|---|---|---|
| Second moment of area, Iₓ | 682,000 mm⁴ | 1.6385 in⁴ |
| Elastic modulus, Sₓ | 17,100 mm³ | 1.0435 in³ |
| Plastic modulus, Zₓ | 21,800 mm³ | 1.3303 in³ |
| Radius of gyration, rₓ | 27.9 mm | 1.0984 in |
| Distance to top fibre | 40 mm | 1.5748 in |
| Distance to bottom fibre | 40 mm | 1.5748 in |
Bending about the minor axis
| Property | Metric | Imperial |
|---|---|---|
| Second moment of area, I_y | 222,000 mm⁴ | 0.533357 in⁴ |
| Elastic modulus, S_y | 11,100 mm³ | 0.677364 in³ |
| Plastic modulus, Z_y | 13,200 mm³ | 0.805513 in³ |
| Radius of gyration, r_y | 15.9 mm | 0.625984 in |
Torsion and warping
| Property | Metric | Imperial |
|---|---|---|
| Torsion constant, J | 552,000 mm⁴ | 1.3262 in⁴ |
Mass
| Property | Metric | Imperial |
|---|---|---|
| Mass per metre | 6.9 kg/m | 4.6366 lb/ft |