Steel Beam Sizes / AISC / W-Shapes / W33 / W33x318

W33x318 Steel Beam Dimensions and Properties

AISC Wide flange · v16.0

Analyze in Beam Calculator Back to W-Shapes All W33

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

Units

Section diagram

W33x318 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 318.00 lb/ft 473.00 kg/m
Depth, d 35.20 in 894.00 mm
Flange width, bf 16.00 in 406.00 mm
tw 1.040 in 26.400 mm
tf 1.890 in 48.000 mm
Area 93.70 in² 60,500.00 mm²
Ix 19,500.00 in⁴ 8,120,000,000 mm⁴
Iy 1,290.00 in⁴ 537,000,000 mm⁴
Sx 1,110.00 in³ 18,200,000 mm³
Sy 161.00 in³ 2,640,000 mm³
Zx 1,270.00 in³ 20,800,000 mm³
Zy 250.00 in³ 4,100,000 mm³
rx 14.50 in 368.00 mm
ry 3.71 in 94.20 mm
J 84.40 in⁴ 35,100,000 mm⁴
Cw 357,000.00 in⁶ 95,900,000,000,000 mm⁶

Alternatives

Useful nearby sections

Same-series weight neighbors, closest Ix, and a nearby depth series when available — with percent change versus W33x318.

Browse W33 series →

Lighter in W33

W33x291

Weight
291.0 lb/ft (-8.5%)
Depth
34.80 in (-1.1%)
Ix
17,700.0 in⁴ (-9.2%)

Heavier in W33

W33x354

Weight
354.0 lb/ft (+11%)
Depth
35.60 in (+1.1%)
Ix
22,000.0 in⁴ (+13%)

Closest Iₓ in W33

W33x263

Weight
263.0 lb/ft (-17%)
Depth
34.50 in (-2.0%)
Ix
15,900.0 in⁴ (-18%)

Similar weight in W36

W36x318

Weight
318.0 lb/ft (0.0%)
Depth
38.20 in (+8.5%)
Ix
21,200.0 in⁴ (+8.7%)
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Source: AISC Shapes Database v16.0 · Methodology