Steel Beam Sizes / AISC / W-Shapes / W18 / W18x311

W18x311 Steel Beam Dimensions and Properties

AISC Wide flange · v16.0

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

Units

Section diagram

W18x311 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 311.00 lb/ft 464.00 kg/m
Depth, d 22.30 in 566.00 mm
Flange width, bf 12.00 in 305.00 mm
tw 1.520 in 38.600 mm
tf 2.740 in 69.600 mm
Area 91.60 in² 59,100.00 mm²
Ix 6,970.00 in⁴ 2,900,000,000 mm⁴
Iy 795.00 in⁴ 331,000,000 mm⁴
Sx 624.00 in³ 10,200,000 mm³
Sy 132.00 in³ 2,160,000 mm³
Zx 754.00 in³ 12,400,000 mm³
Zy 207.00 in³ 3,390,000 mm³
rx 8.72 in 221.00 mm
ry 2.95 in 74.90 mm
J 176.00 in⁴ 73,300,000 mm⁴
Cw 76,200.00 in⁶ 20,500,000,000,000 mm⁶

Alternatives

Useful nearby sections

Same-series weight neighbors, closest Ix, and a nearby depth series when available — with percent change versus W18x311.

Browse W18 series →

Lighter in W18

W18x283

Weight
283.0 lb/ft (-9.0%)
Depth
21.90 in (-1.8%)
Ix
6,170.0 in⁴ (-11%)

Closest Iₓ in W18

W18x258

Weight
258.0 lb/ft (-17%)
Depth
21.50 in (-3.6%)
Ix
5,510.0 in⁴ (-21%)

Similar weight in W21

W21x275

Weight
275.0 lb/ft (-12%)
Depth
24.10 in (+8.1%)
Ix
7,690.0 in⁴ (+10%)
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Source: AISC Shapes Database v16.0 · Methodology