RHS 400×300×8
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 | 400 mm | 15.748 in |
| Width | 300 mm | 11.811 in |
| Thickness, t | 8 mm | 0.314961 in |
Bending about the major axis
| Property | Metric | Imperial |
|---|---|---|
| Second moment of area, Iₓ | 257,000,000 mm⁴ | 617.445 in⁴ |
| Elastic modulus, Sₓ | 1,280,000 mm³ | 78.1104 in³ |
| Plastic modulus, Zₓ | 1,520,000 mm³ | 92.7561 in³ |
| Radius of gyration, rₓ | 154 mm | 6.063 in |
| Distance to top fibre | 200 mm | 7.874 in |
| Distance to bottom fibre | 200 mm | 7.874 in |
Bending about the minor axis
| Property | Metric | Imperial |
|---|---|---|
| Second moment of area, I_y | 165,000,000 mm⁴ | 396.4141 in⁴ |
| Elastic modulus, S_y | 1,100,000 mm³ | 67.1261 in³ |
| Plastic modulus, Z_y | 1,250,000 mm³ | 76.2797 in³ |
| Radius of gyration, r_y | 123 mm | 4.8425 in |
Torsion and warping
| Property | Metric | Imperial |
|---|---|---|
| Torsion constant, J | 310,000,000 mm⁴ | 744.778 in⁴ |
Mass
| Property | Metric | Imperial |
|---|---|---|
| Mass per metre | 85.4 kg/m | 57.3862 lb/ft |