Steel Beam Sizes / AISC / W-Shapes / W21 / W21x50
W21x50 Dimensions, Weight and Section Properties
AISC Wide flange · v16.0
W21x50: 20.8 in depth, 6.53 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
W21x50 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 | 20.80 in | 528.00 mm |
| Flange width, bf | 6.53 in | 166.00 mm |
| tw | 0.380 in | 9.650 mm |
| tf | 0.535 in | 13.600 mm |
| Area | 14.70 in² | 9,480.00 mm² |
| Ix | 984.00 in⁴ | 410,000,000 mm⁴ |
| Iy | 24.90 in⁴ | 10,400,000 mm⁴ |
| Sx | 94.50 in³ | 1,550,000 mm³ |
| Sy | 7.64 in³ | 125,000.00 mm³ |
| Zx | 110.00 in³ | 1,800,000 mm³ |
| Zy | 12.20 in³ | 200,000.00 mm³ |
| rx | 8.18 in | 208.00 mm |
| ry | 1.30 in | 33.00 mm |
| J | 1.14 in⁴ | 475,000.00 mm⁴ |
| Cw | 2,570.00 in⁶ | 690,000,000,000 mm⁶ |
Alternatives
Useful nearby sections
Compare weight neighbors, another Ix option, and a nearby depth series when available, with percent change versus W21x50.
Lighter in W21
W21x48
- Weight
- 48.0 lb/ft (-4.0%)
- Depth
- 20.60 in (-1.0%)
- Ix
- 959.0 in⁴ (-2.5%)
Heavier in W21
W21x55
- Weight
- 55.0 lb/ft (+10%)
- Depth
- 20.80 in (0.0%)
- Ix
- 1,140.0 in⁴ (+16%)
Another Iₓ option in W21
W21x44
- Weight
- 44.0 lb/ft (-12%)
- Depth
- 20.70 in (-0.5%)
- Ix
- 843.0 in⁴ (-14%)
Similar weight in W18
W18x50
- Weight
- 50.0 lb/ft (0.0%)
- Depth
- 18.00 in (-13%)
- Ix
- 800.0 in⁴ (-19%)
Source: AISC Shapes Database v16.0 · Methodology