RHS 80×40×5
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 | 5 mm | 0.19685 in |
Bending about the major axis
| Property | Metric | Imperial |
|---|---|---|
| Second moment of area, Iₓ | 803,000 mm⁴ | 1.9292 in⁴ |
| Elastic modulus, Sₓ | 20,100 mm³ | 1.2266 in³ |
| Plastic modulus, Zₓ | 26,100 mm³ | 1.5927 in³ |
| Radius of gyration, rₓ | 27.4 mm | 1.0787 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 | 257,000 mm⁴ | 0.617445 in⁴ |
| Elastic modulus, S_y | 12,900 mm³ | 0.787206 in³ |
| Plastic modulus, Z_y | 15,700 mm³ | 0.958073 in³ |
| Radius of gyration, r_y | 15.5 mm | 0.610236 in |
Torsion and warping
| Property | Metric | Imperial |
|---|---|---|
| Torsion constant, J | 651,000 mm⁴ | 1.564 in⁴ |
Mass
| Property | Metric | Imperial |
|---|---|---|
| Mass per metre | 8.42 kg/m | 5.658 lb/ft |