Steel Beam Sizes / CISC / W-Shapes / W310×129

W310×129 Steel Beam Dimensions and Properties

CISC Wide flange · v12.1

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

Units

Section diagram

W310×129 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 87.00 lb/ft 129.00 kg/m
Depth, d 12.52 in 318.00 mm
Flange width, bf 12.13 in 308.00 mm
tw 0.516 in 13.100 mm
tf 0.811 in 20.600 mm
Area 25.58 in² 16,500.00 mm²
Ix 739.97 in⁴ 308,000,000 mm⁴
Iy 240.25 in⁴ 100,000,000 mm⁴
Sx 118.39 in³ 1,940,000 mm³
Sy 39.79 in³ 652,000.00 mm³
Zx 131.81 in³ 2,160,000 mm³
Zy 60.47 in³ 991,000.00 mm³
rx 5.39 in 137.00 mm
ry 3.07 in 78.00 mm
J 5.12 in⁴ 2,130,000 mm⁴
Cw 8,267.05 in⁶ 2,220,000,000,000 mm⁶

Alternatives

Useful nearby sections

Same-series weight neighbors, closest Ix, and a nearby depth series when available — with percent change versus W310×129.

Lighter in W310

W310×118

Weight
118.0 kg/m (-9.2%)
Depth
314.0 mm (-1.3%)
Ix
275,000,000 mm⁴ (-11%)

Heavier in W310

W310×143

Weight
143.0 kg/m (+10%)
Depth
323.0 mm (+1.6%)
Ix
348,000,000 mm⁴ (+13%)

Closest Iₓ in W310

W310×107

Weight
107.0 kg/m (-17%)
Depth
311.0 mm (-2.2%)
Ix
248,000,000 mm⁴ (-19%)

Similar weight in W250

W250×131

Weight
131.0 kg/m (+1.1%)
Depth
275.0 mm (-14%)
Ix
221,000,000 mm⁴ (-28%)
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Source: CISC Structural Section Tables SST12.1 · v12.1 · Availability: Imported; readily available in Canada. · Methodology