Steel Beam Sizes / AISC / WT Tees / WT18x91

WT18x91 Steel Beam Dimensions and Properties

AISC Structural tees · v16.0

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

Units

Section diagram

WT18x91 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 91.00 lb/ft 136.00 kg/m
Depth, d 18.20 in 462.00 mm
Flange width, bf 12.10 in 307.00 mm
tw 0.725 in 18.400 mm
tf 1.180 in 30.000 mm
Area 26.80 in² 17,300.00 mm²
Ix 845.00 in⁴ 352,000,000 mm⁴
Iy 174.00 in⁴ 72,400,000 mm⁴
Sx 63.10 in³ 1,030,000 mm³
Sy 28.80 in³ 472,000.00 mm³
Zx 113.00 in³ 1,850,000 mm³
Zy 45.30 in³ 742,000.00 mm³
rx 5.62 in 143.00 mm
ry 2.55 in 64.80 mm
J 9.20 in⁴ 3,830,000 mm⁴
Cw 77.60 in⁶ 20,800,000,000 mm⁶

Alternatives

Useful nearby sections

Same-series weight neighbors, closest Ix, and a nearby depth series when available — with percent change versus WT18x91.

Lighter in WT18

WT18x85

Weight
85.0 lb/ft (-6.6%)
Depth
18.10 in (-0.5%)
Ix
786.0 in⁴ (-7.0%)

Heavier in WT18

WT18x97

Weight
97.0 lb/ft (+6.6%)
Depth
18.20 in (0.0%)
Ix
901.0 in⁴ (+6.6%)

Closest Iₓ in WT18

WT18x80

Weight
80.0 lb/ft (-12%)
Depth
18.00 in (-1.1%)
Ix
740.0 in⁴ (-12%)

Similar weight in WT20

WT20x91.5

Weight
91.5 lb/ft (+0.5%)
Depth
19.50 in (+7.1%)
Ix
955.0 in⁴ (+13%)
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Source: AISC Shapes Database v16.0 · Methodology