Steel Beam Sizes / UK / Angles / L 120×80×12
L 120×80×12 Steel Beam Dimensions and Properties
UK Angles · v2023.11
Diagram, properties emphasis, and nearby alternatives use the selected unit system.
Section diagram
L 120×80×12 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 | 11.96 lb/ft | 17.80 kg/m |
| Width | 3.15 in | 80.00 mm |
| Height | 4.72 in | 120.00 mm |
| t | 0.472 in | 12.000 mm |
| Area | 3.52 in² | 2,270.00 mm² |
| Ix | 7.76 in⁴ | 3,230,000 mm⁴ |
| Iy | 2.74 in⁴ | 1,140,000 mm⁴ |
| Sx | 2.47 in³ | 40,400.00 mm³ |
| Sy | 1.17 in³ | 19,100.00 mm³ |
| rx | 1.48 in | 37.70 mm |
| ry | 0.88 in | 22.40 mm |
| J | 0.28 in⁴ | 116,000.00 mm⁴ |
Alternatives
Useful nearby sections
Same-series weight neighbors, closest Ix, and a nearby depth series when available — with percent change versus L 120×80×12.
Lighter in Angles
L 140×90×10
- Weight
- 17.4 kg/m (-2.2%)
- Depth
- 140.0 mm (+17%)
- Ix
- 4,410,000 mm⁴ (+37%)
Heavier in Angles
L 130×130×9
- Weight
- 17.9 kg/m (+0.6%)
- Depth
- 130.0 mm (+8.3%)
- Ix
- 3,640,000 mm⁴ (+13%)
Closest Iₓ in Angles
L 130×130×8
- Weight
- 16.0 kg/m (-10%)
- Depth
- 130.0 mm (+8.3%)
- Ix
- 3,270,000 mm⁴ (+1.2%)
Source: British-Sections-1 and Eurocode 3 UK shared angle/hollow tables · v2023.11 · Eurocode 3 - UK National Annex · Methodology