Steel Beam Sizes / AISC / W-Shapes / W21 / W21x57
W21x57 Dimensions, Weight and Section Properties
AISC Wide flange · v16.0
W21x57: 21.1 in depth, 6.56 in flange width, 57 lb/ft weight. View the full dimensions and properties in imperial and metric units below.
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Section diagram
W21x57 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 | 57.00 lb/ft | 85.00 kg/m |
| Depth, d | 21.10 in | 536.00 mm |
| Flange width, bf | 6.56 in | 167.00 mm |
| tw | 0.405 in | 10.300 mm |
| tf | 0.650 in | 16.500 mm |
| Area | 16.70 in² | 10,800.00 mm² |
| Ix | 1,170.00 in⁴ | 487,000,000 mm⁴ |
| Iy | 30.60 in⁴ | 12,700,000 mm⁴ |
| Sx | 111.00 in³ | 1,820,000 mm³ |
| Sy | 9.35 in³ | 153,000.00 mm³ |
| Zx | 129.00 in³ | 2,110,000 mm³ |
| Zy | 14.80 in³ | 243,000.00 mm³ |
| rx | 8.36 in | 212.00 mm |
| ry | 1.35 in | 34.30 mm |
| J | 1.77 in⁴ | 737,000.00 mm⁴ |
| Cw | 3,190.00 in⁶ | 857,000,000,000 mm⁶ |
Alternatives
Useful nearby sections
Compare weight neighbors, another Ix option, and a nearby depth series when available, with percent change versus W21x57.
Lighter in W21
W21x55
- Weight
- 55.0 lb/ft (-3.5%)
- Depth
- 20.80 in (-1.4%)
- Ix
- 1,140.0 in⁴ (-2.6%)
Heavier in W21
W21x62
- Weight
- 62.0 lb/ft (+8.8%)
- Depth
- 21.00 in (-0.5%)
- Ix
- 1,330.0 in⁴ (+14%)
Another Iₓ option in W21
W21x50
- Weight
- 50.0 lb/ft (-12%)
- Depth
- 20.80 in (-1.4%)
- Ix
- 984.0 in⁴ (-16%)
Similar weight in W24
W24x55
- Weight
- 55.0 lb/ft (-3.5%)
- Depth
- 23.60 in (+12%)
- Ix
- 1,350.0 in⁴ (+15%)
Source: AISC Shapes Database v16.0 · Methodology