Steel Beam Sizes / AISC / WT Tees / WT8x18
WT8x18 Steel Beam Dimensions and Properties
AISC Structural tees · v16.0
Diagram, properties emphasis, and nearby alternatives use the selected unit system.
Section diagram
WT8x18 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 | 18.00 lb/ft | 26.50 kg/m |
| Depth, d | 7.93 in | 201.00 mm |
| Flange width, bf | 6.99 in | 178.00 mm |
| tw | 0.295 in | 7.490 mm |
| tf | 0.430 in | 10.900 mm |
| Area | 5.29 in² | 3,410.00 mm² |
| Ix | 30.60 in⁴ | 12,700,000 mm⁴ |
| Iy | 12.20 in⁴ | 5,080,000 mm⁴ |
| Sx | 5.05 in³ | 82,800.00 mm³ |
| Sy | 3.50 in³ | 57,400.00 mm³ |
| Zx | 8.93 in³ | 146,000.00 mm³ |
| Zy | 5.42 in³ | 88,800.00 mm³ |
| rx | 2.41 in | 61.20 mm |
| ry | 1.52 in | 38.60 mm |
| J | 0.27 in⁴ | 113,000.00 mm⁴ |
| Cw | 0.52 in⁶ | 139,000,000 mm⁶ |
Alternatives
Useful nearby sections
Same-series weight neighbors, closest Ix, and a nearby depth series when available — with percent change versus WT8x18.
Lighter in WT8
WT8x15.5
- Weight
- 15.5 lb/ft (-14%)
- Depth
- 7.94 in (+0.1%)
- Ix
- 27.5 in⁴ (-10%)
Heavier in WT8
WT8x20
- Weight
- 20.0 lb/ft (+11%)
- Depth
- 8.01 in (+1.0%)
- Ix
- 33.1 in⁴ (+8.2%)
Closest Iₓ in WT8
WT8x13
- Weight
- 13.0 lb/ft (-28%)
- Depth
- 7.85 in (-1.0%)
- Ix
- 23.5 in⁴ (-23%)
Similar weight in WT9
WT9x17.5
- Weight
- 17.5 lb/ft (-2.8%)
- Depth
- 8.85 in (+12%)
- Ix
- 40.1 in⁴ (+31%)
Source: AISC Shapes Database v16.0 · Methodology