Steel Beam Sizes / Europe / RHS / RHS 120×80×4
RHS 120×80×4 Steel Beam Dimensions and Properties
EN Rectangular hollow sections · v2026.1
Diagram, properties emphasis, and nearby alternatives use the selected unit system.
Section diagram
RHS 120×80×4 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 | 8.00 lb/ft | 11.90 kg/m |
| Height | 4.72 in | 120.00 mm |
| Width | 3.15 in | 80.00 mm |
| t | 0.157 in | 4.000 mm |
| Area | 2.36 in² | 1,520.00 mm² |
| Ix | 7.28 in⁴ | 3,030,000 mm⁴ |
| Iy | 3.87 in⁴ | 1,610,000 mm⁴ |
| Sx | 3.08 in³ | 50,400.00 mm³ |
| Sy | 2.45 in³ | 40,200.00 mm³ |
| Zx | 3.73 in³ | 61,200.00 mm³ |
| Zy | 2.81 in³ | 46,100.00 mm³ |
| rx | 1.76 in | 44.60 mm |
| ry | 1.28 in | 32.50 mm |
| J | 7.93 in⁴ | 3,300,000 mm⁴ |
Alternatives
Useful nearby sections
Same-series weight neighbors, closest Ix, and a nearby depth series when available — with percent change versus RHS 120×80×4.
Lighter in Rectangular hollow sections
RHS 100×60×5
- Weight
- 11.6 kg/m (-2.5%)
- Depth
- 100.0 mm (-17%)
- Ix
- 1,890,000 mm⁴ (-38%)
Heavier in Rectangular hollow sections
RHS 90×50×6.3
- Weight
- 12.3 kg/m (+3.4%)
- Depth
- 90.0 mm (-25%)
- Ix
- 1,500,000 mm⁴ (-50%)
Closest Iₓ in Rectangular hollow sections
RHS 100×60×10
- Weight
- 21.1 kg/m (+77%)
- Depth
- 100.0 mm (-17%)
- Ix
- 2,990,000 mm⁴ (-1.3%)
Source: Eurocode 3 UK National Annex and ArcelorMittal Sections 2026-1 · v2026.1 · Hot-finished hollow sections · Methodology