Steel Beam Sizes / AISC / W-Shapes / W21 / W21x73

W21x73 Steel Beam Dimensions and Properties

AISC Wide flange · v16.0

Analyze in Beam Calculator Back to W-Shapes All W21

Diagram, properties emphasis, and nearby alternatives use the selected unit system.

Units

Section diagram

W21x73 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 73.00 lb/ft 109.00 kg/m
Depth, d 21.20 in 538.00 mm
Flange width, bf 8.30 in 211.00 mm
tw 0.455 in 11.600 mm
tf 0.740 in 18.800 mm
Area 21.50 in² 13,900.00 mm²
Ix 1,600.00 in⁴ 666,000,000 mm⁴
Iy 70.60 in⁴ 29,400,000 mm⁴
Sx 151.00 in³ 2,470,000 mm³
Sy 17.00 in³ 279,000.00 mm³
Zx 172.00 in³ 2,820,000 mm³
Zy 26.60 in³ 436,000.00 mm³
rx 8.64 in 219.00 mm
ry 1.81 in 46.00 mm
J 3.02 in⁴ 1,260,000 mm⁴
Cw 7,410.00 in⁶ 1,990,000,000,000 mm⁶

Alternatives

Useful nearby sections

Same-series weight neighbors, closest Ix, and a nearby depth series when available — with percent change versus W21x73.

Browse W21 series →

Lighter in W21

W21x68

Weight
68.0 lb/ft (-6.8%)
Depth
21.10 in (-0.5%)
Ix
1,480.0 in⁴ (-7.5%)

Heavier in W21

W21x83

Weight
83.0 lb/ft (+14%)
Depth
21.40 in (+0.9%)
Ix
1,830.0 in⁴ (+14%)

Closest Iₓ in W21

W21x62

Weight
62.0 lb/ft (-15%)
Depth
21.00 in (-0.9%)
Ix
1,330.0 in⁴ (-17%)

Similar weight in W18

W18x71

Weight
71.0 lb/ft (-2.7%)
Depth
18.50 in (-13%)
Ix
1,170.0 in⁴ (-27%)
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Source: AISC Shapes Database v16.0 · Methodology