Steel Beam Sizes / AISC / W-Shapes / W12 / W12x40

W12x40 Steel Beam Dimensions and Properties

AISC Wide flange · v16.0

Analyze in Beam Calculator Back to W-Shapes All W12

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

Units

Section diagram

W12x40 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 40.00 lb/ft 60.00 kg/m
Depth, d 11.90 in 302.00 mm
Flange width, bf 8.01 in 203.00 mm
tw 0.295 in 7.490 mm
tf 0.515 in 13.100 mm
Area 11.70 in² 7,550.00 mm²
Ix 307.00 in⁴ 128,000,000 mm⁴
Iy 44.10 in⁴ 18,400,000 mm⁴
Sx 51.50 in³ 844,000.00 mm³
Sy 11.00 in³ 180,000.00 mm³
Zx 57.00 in³ 934,000.00 mm³
Zy 16.80 in³ 275,000.00 mm³
rx 5.13 in 130.00 mm
ry 1.94 in 49.30 mm
J 0.91 in⁴ 377,000.00 mm⁴
Cw 1,440.00 in⁶ 387,000,000,000 mm⁶

Alternatives

Useful nearby sections

Same-series weight neighbors, closest Ix, and a nearby depth series when available — with percent change versus W12x40.

Browse W12 series →

Lighter in W12

W12x35

Weight
35.0 lb/ft (-13%)
Depth
12.50 in (+5.0%)
Ix
285.0 in⁴ (-7.2%)

Heavier in W12

W12x45

Weight
45.0 lb/ft (+13%)
Depth
12.10 in (+1.7%)
Ix
348.0 in⁴ (+13%)

Closest Iₓ in W12

W12x30

Weight
30.0 lb/ft (-25%)
Depth
12.30 in (+3.4%)
Ix
238.0 in⁴ (-22%)

Similar weight in W10

W10x39

Weight
39.0 lb/ft (-2.5%)
Depth
9.92 in (-17%)
Ix
209.0 in⁴ (-32%)
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Source: AISC Shapes Database v16.0 · Methodology