RHS 120×80×4
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 | 120 mm | 4.7244 in |
| Width | 80 mm | 3.1496 in |
| Thickness, t | 4 mm | 0.15748 in |
Bending about the major axis
| Property | Metric | Imperial |
|---|---|---|
| Second moment of area, Iₓ | 3,030,000 mm⁴ | 7.2796 in⁴ |
| Elastic modulus, Sₓ | 50,400 mm³ | 3.0756 in³ |
| Plastic modulus, Zₓ | 61,200 mm³ | 3.7347 in³ |
| Radius of gyration, rₓ | 44.6 mm | 1.7559 in |
| Distance to top fibre | 60 mm | 2.3622 in |
| Distance to bottom fibre | 60 mm | 2.3622 in |
Bending about the minor axis
| Property | Metric | Imperial |
|---|---|---|
| Second moment of area, I_y | 1,610,000 mm⁴ | 3.868 in⁴ |
| Elastic modulus, S_y | 40,200 mm³ | 2.4532 in³ |
| Plastic modulus, Z_y | 46,100 mm³ | 2.8132 in³ |
| Radius of gyration, r_y | 32.5 mm | 1.2795 in |
Torsion and warping
| Property | Metric | Imperial |
|---|---|---|
| Torsion constant, J | 3,300,000 mm⁴ | 7.9283 in⁴ |
Mass
| Property | Metric | Imperial |
|---|---|---|
| Mass per metre | 11.9 kg/m | 7.9964 lb/ft |