Steel Beam Sizes / AISC / W-Shapes / W18 / W18x71

W18x71 Steel Beam Dimensions and Properties

AISC Wide flange · v16.0

Analyze in Beam Calculator Back to W-Shapes All W18

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

Units

Section diagram

W18x71 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 71.00 lb/ft 106.00 kg/m
Depth, d 18.50 in 470.00 mm
Flange width, bf 7.64 in 194.00 mm
tw 0.495 in 12.600 mm
tf 0.810 in 20.600 mm
Area 20.90 in² 13,500.00 mm²
Ix 1,170.00 in⁴ 487,000,000 mm⁴
Iy 60.30 in⁴ 25,100,000 mm⁴
Sx 127.00 in³ 2,080,000 mm³
Sy 15.80 in³ 259,000.00 mm³
Zx 146.00 in³ 2,390,000 mm³
Zy 24.70 in³ 405,000.00 mm³
rx 7.50 in 191.00 mm
ry 1.70 in 43.20 mm
J 3.49 in⁴ 1,450,000 mm⁴
Cw 4,700.00 in⁶ 1,260,000,000,000 mm⁶

Alternatives

Useful nearby sections

Same-series weight neighbors, closest Ix, and a nearby depth series when available — with percent change versus W18x71.

Browse W18 series →

Lighter in W18

W18x65

Weight
65.0 lb/ft (-8.5%)
Depth
18.40 in (-0.5%)
Ix
1,070.0 in⁴ (-8.5%)

Heavier in W18

W18x76

Weight
76.0 lb/ft (+7.0%)
Depth
18.20 in (-1.6%)
Ix
1,330.0 in⁴ (+14%)

Closest Iₓ in W18

W18x60

Weight
60.0 lb/ft (-15%)
Depth
18.20 in (-1.6%)
Ix
984.0 in⁴ (-16%)

Similar weight in W21

W21x73

Weight
73.0 lb/ft (+2.8%)
Depth
21.20 in (+15%)
Ix
1,600.0 in⁴ (+37%)
Analyze in Beam Calculator Compare in W-Shapes finder

Source: AISC Shapes Database v16.0 · Methodology