RHS 80×40×8
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 | 8 mm | 0.314961 in |
Bending about the major axis
| Property | Metric | Imperial |
|---|---|---|
| Second moment of area, Iₓ | 1,060,000 mm⁴ | 2.5467 in⁴ |
| Elastic modulus, Sₓ | 26,500 mm³ | 1.6171 in³ |
| Plastic modulus, Zₓ | 36,500 mm³ | 2.2274 in³ |
| Radius of gyration, rₓ | 25.8 mm | 1.0157 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 | 321,000 mm⁴ | 0.771206 in⁴ |
| Elastic modulus, S_y | 16,100 mm³ | 0.982482 in³ |
| Plastic modulus, Z_y | 21,200 mm³ | 1.2937 in³ |
| Radius of gyration, r_y | 14.2 mm | 0.559055 in |
Torsion and warping
| Property | Metric | Imperial |
|---|---|---|
| Torsion constant, J | 858,000 mm⁴ | 2.0614 in⁴ |
Mass
| Property | Metric | Imperial |
|---|---|---|
| Mass per metre | 12.5 kg/m | 8.3996 lb/ft |