Steel Beam Sizes / AISC / W-Shapes / W18 / W18x50
W18x50 Dimensions, Weight and Section Properties
AISC Wide flange · v16.0
W18x50: 18 in depth, 7.5 in flange width, 50 lb/ft weight. View the full dimensions and properties in imperial and metric units below.
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Section diagram
W18x50 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 | 50.00 lb/ft | 74.00 kg/m |
| Depth, d | 18.00 in | 457.00 mm |
| Flange width, bf | 7.50 in | 191.00 mm |
| tw | 0.355 in | 9.020 mm |
| tf | 0.570 in | 14.500 mm |
| Area | 14.70 in² | 9,480.00 mm² |
| Ix | 800.00 in⁴ | 333,000,000 mm⁴ |
| Iy | 40.10 in⁴ | 16,700,000 mm⁴ |
| Sx | 88.90 in³ | 1,460,000 mm³ |
| Sy | 10.70 in³ | 175,000.00 mm³ |
| Zx | 101.00 in³ | 1,660,000 mm³ |
| Zy | 16.60 in³ | 272,000.00 mm³ |
| rx | 7.38 in | 187.00 mm |
| ry | 1.65 in | 41.90 mm |
| J | 1.24 in⁴ | 516,000.00 mm⁴ |
| Cw | 3,040.00 in⁶ | 816,000,000,000 mm⁶ |
Alternatives
Useful nearby sections
Compare weight neighbors, another Ix option, and a nearby depth series when available, with percent change versus W18x50.
Lighter in W18
W18x46
- Weight
- 46.0 lb/ft (-8.0%)
- Depth
- 18.10 in (+0.6%)
- Ix
- 712.0 in⁴ (-11%)
Heavier in W18
W18x55
- Weight
- 55.0 lb/ft (+10%)
- Depth
- 18.10 in (+0.6%)
- Ix
- 890.0 in⁴ (+11%)
Another Iₓ option in W18
W18x60
- Weight
- 60.0 lb/ft (+20%)
- Depth
- 18.20 in (+1.1%)
- Ix
- 984.0 in⁴ (+23%)
Similar weight in W21
W21x50
- Weight
- 50.0 lb/ft (0.0%)
- Depth
- 20.80 in (+16%)
- Ix
- 984.0 in⁴ (+23%)
Source: AISC Shapes Database v16.0 · Methodology