Steel Beam Sizes / CISC / Angles / L51×51×7.9
L51×51×7.9 Steel Beam Dimensions and Properties
CISC Angles · v12.1
Diagram, properties emphasis, and nearby alternatives use the selected unit system.
Section diagram
L51×51×7.9 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 | 3.92 lb/ft | 5.80 kg/m |
| Width | 2.00 in | 50.80 mm |
| Height | 2.00 in | 50.80 mm |
| t | 0.313 in | 7.940 mm |
| Area | 1.15 in² | 744.00 mm² |
| Ix | 0.42 in⁴ | 173,000.00 mm⁴ |
| Iy | 0.42 in⁴ | 173,000.00 mm⁴ |
| Sx | 0.30 in³ | 4,920.00 mm³ |
| Sy | 0.30 in³ | 4,920.00 mm³ |
| rx | 0.60 in | 15.30 mm |
| ry | 0.60 in | 15.30 mm |
| J | 0.04 in⁴ | 15,600.00 mm⁴ |
| Cw | 0.01 in⁶ | 2,860,000 mm⁶ |
Alternatives
Useful nearby sections
Same-series weight neighbors, closest Ix, and a nearby depth series when available — with percent change versus L51×51×7.9.
Lighter in L51
L51×51×6.4
- Weight
- 4.7 kg/m (-19%)
- Depth
- 50.8 mm (0.0%)
- Ix
- 145,000 mm⁴ (-16%)
Heavier in L51
L51×51×9.5
- Weight
- 7.0 kg/m (+20%)
- Depth
- 50.8 mm (0.0%)
- Ix
- 199,000 mm⁴ (+15%)
Closest Iₓ in L51
L51×38×6.4
- Weight
- 4.2 kg/m (-29%)
- Depth
- 50.8 mm (0.0%)
- Ix
- 131,000 mm⁴ (-24%)
Similar weight in L64
L64×64×6.4
- Weight
- 6.1 kg/m (+4.6%)
- Depth
- 63.5 mm (+25%)
- Ix
- 293,000 mm⁴ (+69%)
Source: CISC Structural Section Tables SST12.1 · v12.1 · Methodology