Steel Beam Sizes / AISC / WT Tees / WT8x18
WT8x18 Dimensions, Weight and Section Properties
AISC Structural tees · v16.0
WT8x18: 7.93 in depth, 6.99 in flange width, 18 lb/ft weight. View the full dimensions and properties in imperial and metric units below.
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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
Compare weight neighbors, another Ix option, 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%)
Another Iₓ option 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