RHS 80×40×3
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 | 3 mm | 0.11811 in |
Bending about the major axis
| Property | Metric | Imperial |
|---|---|---|
| Second moment of area, Iₓ | 542,000 mm⁴ | 1.3022 in⁴ |
| Elastic modulus, Sₓ | 13,600 mm³ | 0.829923 in³ |
| Plastic modulus, Zₓ | 17,100 mm³ | 1.0435 in³ |
| Radius of gyration, rₓ | 28.4 mm | 1.1181 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 | 180,000 mm⁴ | 0.432452 in⁴ |
| Elastic modulus, S_y | 9,000 mm³ | 0.549214 in³ |
| Plastic modulus, Z_y | 10,400 mm³ | 0.634647 in³ |
| Radius of gyration, r_y | 16.3 mm | 0.641732 in |
Torsion and warping
| Property | Metric | Imperial |
|---|---|---|
| Torsion constant, J | 438,000 mm⁴ | 1.0523 in⁴ |
Mass
| Property | Metric | Imperial |
|---|---|---|
| Mass per metre | 5.29 kg/m | 3.5547 lb/ft |