Steel Beam Sizes / AISC / WT Tees / WT20x138.5

WT20x138.5 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

WT20x138.5 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 138.50 lb/ft 206.00 kg/m
Depth, d 19.80 in 503.00 mm
Flange width, bf 15.80 in 401.00 mm
tw 0.830 in 21.100 mm
tf 1.580 in 40.100 mm
Area 40.70 in² 26,300.00 mm²
Ix 1,360.00 in⁴ 566,000,000 mm⁴
Iy 522.00 in⁴ 217,000,000 mm⁴
Sx 88.60 in³ 1,450,000 mm³
Sy 65.90 in³ 1,080,000 mm³
Zx 157.00 in³ 2,570,000 mm³
Zy 102.00 in³ 1,670,000 mm³
rx 5.78 in 147.00 mm
ry 3.58 in 90.90 mm
J 25.70 in⁴ 10,700,000 mm⁴
Cw 218.00 in⁶ 58,500,000,000 mm⁶

Alternatives

Useful nearby sections

Same-series weight neighbors, closest Ix, and a nearby depth series when available — with percent change versus WT20x138.5.

Lighter in WT20

WT20x132

Weight
132.0 lb/ft (-4.7%)
Depth
20.00 in (+1.0%)
Ix
1,450.0 in⁴ (+6.6%)

Heavier in WT20

WT20x139

Weight
139.0 lb/ft (+0.4%)
Depth
20.10 in (+1.5%)
Ix
1,550.0 in⁴ (+14%)

Closest Iₓ in WT20

WT20x117.5

Weight
117.5 lb/ft (-15%)
Depth
19.80 in (0.0%)
Ix
1,260.0 in⁴ (-7.4%)

Similar weight in WT18

WT18x141

Weight
141.0 lb/ft (+1.8%)
Depth
18.60 in (-6.1%)
Ix
1,190.0 in⁴ (-13%)
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Source: AISC Shapes Database v16.0 · Methodology