RHS 80×40×7.1
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 | 7.1 mm | 0.279528 in |
Bending about the major axis
| Property | Metric | Imperial |
|---|---|---|
| Second moment of area, Iₓ | 998,000 mm⁴ | 2.3977 in⁴ |
| Elastic modulus, Sₓ | 25,000 mm³ | 1.5256 in³ |
| Plastic modulus, Zₓ | 33,800 mm³ | 2.0626 in³ |
| Radius of gyration, rₓ | 26.3 mm | 1.0354 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 | 307,000 mm⁴ | 0.73757 in⁴ |
| Elastic modulus, S_y | 15,400 mm³ | 0.939766 in³ |
| Plastic modulus, Z_y | 19,800 mm³ | 1.2083 in³ |
| Radius of gyration, r_y | 14.6 mm | 0.574803 in |
Torsion and warping
| Property | Metric | Imperial |
|---|---|---|
| Torsion constant, J | 809,000 mm⁴ | 1.9436 in⁴ |
Mass
| Property | Metric | Imperial |
|---|---|---|
| Mass per metre | 11.4 kg/m | 7.6604 lb/ft |