Steel Beam Sizes / AISC / W-Shapes / W21 / W21x166
W21x166 Steel Beam Dimensions and Properties
AISC Wide flange · v16.0
Diagram, properties emphasis, and nearby alternatives use the selected unit system.
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
Same-series weight neighbors, closest Ix, 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%)
Closest Iₓ 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