RHS 180×100×4
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 | 180 mm | 7.0866 in |
| Width | 100 mm | 3.937 in |
| Thickness, t | 4 mm | 0.15748 in |
Bending about the major axis
| Property | Metric | Imperial |
|---|---|---|
| Second moment of area, Iₓ | 9,450,000 mm⁴ | 22.7037 in⁴ |
| Elastic modulus, Sₓ | 105,000 mm³ | 6.4075 in³ |
| Plastic modulus, Zₓ | 128,000 mm³ | 7.811 in³ |
| Radius of gyration, rₓ | 66.1 mm | 2.6024 in |
| Distance to top fibre | 90 mm | 3.5433 in |
| Distance to bottom fibre | 90 mm | 3.5433 in |
Bending about the minor axis
| Property | Metric | Imperial |
|---|---|---|
| Second moment of area, I_y | 3,790,000 mm⁴ | 9.1055 in⁴ |
| Elastic modulus, S_y | 75,900 mm³ | 4.6317 in³ |
| Plastic modulus, Z_y | 85,200 mm³ | 5.1992 in³ |
| Radius of gyration, r_y | 41.9 mm | 1.6496 in |
Torsion and warping
| Property | Metric | Imperial |
|---|---|---|
| Torsion constant, J | 8,520,000 mm⁴ | 20.4694 in⁴ |
Mass
| Property | Metric | Imperial |
|---|---|---|
| Mass per metre | 16.9 kg/m | 11.3563 lb/ft |