Steel Beam Sizes / UK / RHS / RHS 80×40×8
RHS 80×40×8 Dimensions, Weight and Section Properties
UK Rectangular hollow sections · v2023.11
RHS 80×40×8: 12.5 kg/m weight. View the full dimensions and properties in imperial and metric units below.
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Section diagram
RHS 80×40×8 dimensions
Not to scale. Dimensions shown for reference.
Section properties
Symbols match the steel section finder. Imperial and metric values are shown side by side.
| Property | Imperial | Metric |
|---|---|---|
| Weight | 8.40 lb/ft | 12.50 kg/m |
| Height | 3.15 in | 80.00 mm |
| Width | 1.57 in | 40.00 mm |
| t | 0.315 in | 8.000 mm |
| Area | 2.48 in² | 1,600.00 mm² |
| Ix | 2.55 in⁴ | 1,060,000 mm⁴ |
| Iy | 0.77 in⁴ | 321,000.00 mm⁴ |
| Sx | 1.62 in³ | 26,500.00 mm³ |
| Sy | 0.98 in³ | 16,100.00 mm³ |
| Zx | 2.23 in³ | 36,500.00 mm³ |
| Zy | 1.29 in³ | 21,200.00 mm³ |
| rx | 1.02 in | 25.80 mm |
| ry | 0.56 in | 14.20 mm |
| J | 2.06 in⁴ | 858,000.00 mm⁴ |
Alternatives
Useful nearby sections
Compare weight neighbors, another Ix option, and a nearby depth series when available, with percent change versus RHS 80×40×8.
Lighter in Rectangular hollow sections
RHS 90×50×6.3
- Weight
- 12.3 kg/m (-1.6%)
- Depth
- 90.0 mm (+13%)
- Ix
- 1,500,000 mm⁴ (+42%)
Heavier in Rectangular hollow sections
RHS 100×60×5.6
- Weight
- 12.8 kg/m (+2.4%)
- Depth
- 100.0 mm (+25%)
- Ix
- 2,060,000 mm⁴ (+94%)
Another Iₓ option in Rectangular hollow sections
RHS 90×50×4
- Weight
- 8.2 kg/m (-35%)
- Depth
- 90.0 mm (+13%)
- Ix
- 1,070,000 mm⁴ (+0.9%)
Source: British-Sections-1 and Eurocode 3 UK shared angle/hollow tables · v2023.11 · Hot-finished hollow sections · Methodology