Steel Beam Sizes / UK / RHS / RHS 120×80×8
RHS 120×80×8 Steel Beam Dimensions and Properties
UK Rectangular hollow sections · v2023.11
Diagram, properties emphasis, and nearby alternatives use the selected unit system.
Section diagram
RHS 120×80×8 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 | 15.19 lb/ft | 22.60 kg/m |
| Height | 4.72 in | 120.00 mm |
| Width | 3.15 in | 80.00 mm |
| t | 0.315 in | 8.000 mm |
| Area | 4.46 in² | 2,880.00 mm² |
| Ix | 12.61 in⁴ | 5,250,000 mm⁴ |
| Iy | 6.56 in⁴ | 2,730,000 mm⁴ |
| Sx | 5.34 in³ | 87,500.00 mm³ |
| Sy | 4.16 in³ | 68,100.00 mm³ |
| Zx | 6.77 in³ | 111,000.00 mm³ |
| Zy | 5.04 in³ | 82,600.00 mm³ |
| rx | 1.68 in | 42.70 mm |
| ry | 1.21 in | 30.80 mm |
| J | 14.10 in⁴ | 5,870,000 mm⁴ |
Alternatives
Useful nearby sections
Same-series weight neighbors, closest Ix, and a nearby depth series when available — with percent change versus RHS 120×80×8.
Lighter in Rectangular hollow sections
RHS 160×80×6.3
- Weight
- 22.2 kg/m (-1.8%)
- Depth
- 160.0 mm (+33%)
- Ix
- 9,030,000 mm⁴ (+72%)
Heavier in Rectangular hollow sections
RHS 150×100×6.3
- Weight
- 23.1 kg/m (+2.2%)
- Depth
- 150.0 mm (+25%)
- Ix
- 8,980,000 mm⁴ (+71%)
Closest Iₓ in Rectangular hollow sections
RHS 120×80×8.8
- Weight
- 24.5 kg/m (+8.4%)
- Depth
- 120.0 mm (0.0%)
- Ix
- 5,610,000 mm⁴ (+6.9%)
Source: British-Sections-1 and Eurocode 3 UK shared angle/hollow tables · v2023.11 · Hot-finished hollow sections · Methodology