RHS 300×100×12.5
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 | 300 mm | 11.811 in |
| Width | 100 mm | 3.937 in |
| Thickness, t | 12.5 mm | 0.492126 in |
Bending about the major axis
| Property | Metric | Imperial |
|---|---|---|
| Second moment of area, Iₓ | 91,000,000 mm⁴ | 218.6284 in⁴ |
| Elastic modulus, Sₓ | 607,000 mm³ | 37.0414 in³ |
| Plastic modulus, Zₓ | 806,000 mm³ | 49.1851 in³ |
| Radius of gyration, rₓ | 99.4 mm | 3.9134 in |
| Distance to top fibre | 150 mm | 5.9055 in |
| Distance to bottom fibre | 150 mm | 5.9055 in |
Bending about the minor axis
| Property | Metric | Imperial |
|---|---|---|
| Second moment of area, I_y | 14,900,000 mm⁴ | 35.7974 in⁴ |
| Elastic modulus, S_y | 297,000 mm³ | 18.1241 in³ |
| Plastic modulus, Z_y | 354,000 mm³ | 21.6024 in³ |
| Radius of gyration, r_y | 40.2 mm | 1.5827 in |
Torsion and warping
| Property | Metric | Imperial |
|---|---|---|
| Torsion constant, J | 43,500,000 mm⁴ | 104.5092 in⁴ |
Mass
| Property | Metric | Imperial |
|---|---|---|
| Mass per metre | 72.3 kg/m | 48.5834 lb/ft |