Steel Beam Sizes / AISC / W-Shapes / W21 / W21x166
W21x166 Dimensions, Weight and Section Properties
AISC Wide flange · v16.0
W21x166: 22.5 in depth, 12.4 in flange width, 166 lb/ft weight. View the full dimensions and properties in imperial and metric units below.
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Section diagram
W21x166 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 | 166.00 lb/ft | 248.00 kg/m |
| Depth, d | 22.50 in | 572.00 mm |
| Flange width, bf | 12.40 in | 315.00 mm |
| tw | 0.750 in | 19.100 mm |
| tf | 1.360 in | 34.500 mm |
| Area | 48.80 in² | 31,500.00 mm² |
| Ix | 4,280.00 in⁴ | 1,780,000,000 mm⁴ |
| Iy | 435.00 in⁴ | 181,000,000 mm⁴ |
| Sx | 380.00 in³ | 6,230,000 mm³ |
| Sy | 70.00 in³ | 1,150,000 mm³ |
| Zx | 432.00 in³ | 7,080,000 mm³ |
| Zy | 108.00 in³ | 1,770,000 mm³ |
| rx | 9.36 in | 238.00 mm |
| ry | 2.99 in | 75.90 mm |
| J | 23.60 in⁴ | 9,820,000 mm⁴ |
| Cw | 48,500.00 in⁶ | 13,000,000,000,000 mm⁶ |
Alternatives
Useful nearby sections
Compare weight neighbors, another Ix option, and a nearby depth series when available, with percent change versus W21x166.
Lighter in W21
W21x147
- Weight
- 147.0 lb/ft (-11%)
- Depth
- 22.10 in (-1.8%)
- Ix
- 3,630.0 in⁴ (-15%)
Heavier in W21
W21x182
- Weight
- 182.0 lb/ft (+9.6%)
- Depth
- 22.70 in (+0.9%)
- Ix
- 4,730.0 in⁴ (+11%)
Another Iₓ option in W21
W21x201
- Weight
- 201.0 lb/ft (+21%)
- Depth
- 23.00 in (+2.2%)
- Ix
- 5,310.0 in⁴ (+24%)
Similar weight in W24
W24x162
- Weight
- 162.0 lb/ft (-2.4%)
- Depth
- 25.00 in (+11%)
- Ix
- 5,170.0 in⁴ (+21%)
Source: AISC Shapes Database v16.0 · Methodology