Steel Beam Sizes / AISC / W-Shapes / W40 / W40x278

W40x278 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

W40x278 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 278.00 lb/ft 415.00 kg/m
Depth, d 40.20 in 1,020.00 mm
Flange width, bf 12.00 in 305.00 mm
tw 1.030 in 26.200 mm
tf 1.810 in 46.000 mm
Area 82.30 in² 53,100.00 mm²
Ix 20,500.00 in⁴ 8,530,000,000 mm⁴
Iy 521.00 in⁴ 217,000,000 mm⁴
Sx 1,020.00 in³ 16,700,000 mm³
Sy 87.10 in³ 1,430,000 mm³
Zx 1,190.00 in³ 19,500,000 mm³
Zy 140.00 in³ 2,290,000 mm³
rx 15.80 in 401.00 mm
ry 2.52 in 64.00 mm
J 65.00 in⁴ 27,100,000 mm⁴
Cw 192,000.00 in⁶ 51,600,000,000,000 mm⁶

Alternatives

Useful nearby sections

Same-series weight neighbors, closest Ix, and a nearby depth series when available — with percent change versus W40x278.

Browse W40 series →

Lighter in W40

W40x277

Weight
277.0 lb/ft (-0.4%)
Depth
39.70 in (-1.2%)
Ix
21,900.0 in⁴ (+6.8%)

Heavier in W40

W40x294

Weight
294.0 lb/ft (+5.8%)
Depth
40.40 in (+0.5%)
Ix
21,900.0 in⁴ (+6.8%)

Closest Iₓ in W40

W40x249

Weight
249.0 lb/ft (-10%)
Depth
39.40 in (-2.0%)
Ix
19,600.0 in⁴ (-4.4%)

Similar weight in W36

W36x282

Weight
282.0 lb/ft (+1.4%)
Depth
37.10 in (-7.7%)
Ix
19,600.0 in⁴ (-4.4%)
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Source: AISC Shapes Database v16.0 · Methodology