RHS 400×300×12.5
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 | 400 mm | 15.748 in |
| Width | 300 mm | 11.811 in |
| Thickness, t | 12.5 mm | 0.492126 in |
Bending about the major axis
| Property | Metric | Imperial |
|---|---|---|
| Second moment of area, Iₓ | 385,000,000 mm⁴ | 924.9662 in⁴ |
| Elastic modulus, Sₓ | 1,920,000 mm³ | 117.1656 in³ |
| Plastic modulus, Zₓ | 2,300,000 mm³ | 140.3546 in³ |
| Radius of gyration, rₓ | 152 mm | 5.9843 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 | 246,000,000 mm⁴ | 591.0174 in⁴ |
| Elastic modulus, S_y | 1,640,000 mm³ | 100.0789 in³ |
| Plastic modulus, Z_y | 1,880,000 mm³ | 114.7246 in³ |
| Radius of gyration, r_y | 121 mm | 4.7638 in |
Torsion and warping
| Property | Metric | Imperial |
|---|---|---|
| Torsion constant, J | 468,000,000 mm⁴ | 1,124.374 in⁴ |
Mass
| Property | Metric | Imperial |
|---|---|---|
| Mass per metre | 131 kg/m | 88.0279 lb/ft |