Steel Beam Sizes / AISC / S-Shapes / S20x66

S20x66 Steel Beam Dimensions and Properties

AISC American standard beams · v16.0

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

Units

Section diagram

S20x66 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 66.00 lb/ft 98.20 kg/m
Depth, d 20.00 in 508.00 mm
Flange width, bf 6.26 in 159.00 mm
tw 0.505 in 12.800 mm
tf 0.795 in 20.200 mm
Area 19.40 in² 12,500.00 mm²
Ix 1,190.00 in⁴ 495,000,000 mm⁴
Iy 27.50 in⁴ 11,400,000 mm⁴
Sx 119.00 in³ 1,950,000 mm³
Sy 8.78 in³ 144,000.00 mm³
Zx 139.00 in³ 2,280,000 mm³
Zy 15.40 in³ 252,000.00 mm³
rx 7.83 in 199.00 mm
ry 1.19 in 30.20 mm
J 3.58 in⁴ 1,490,000 mm⁴
Cw 2,530.00 in⁶ 679,000,000,000 mm⁶

Alternatives

Useful nearby sections

Same-series weight neighbors, closest Ix, and a nearby depth series when available — with percent change versus S20x66.

Heavier in S20

S20x75

Weight
75.0 lb/ft (+14%)
Depth
20.00 in (0.0%)
Ix
1,280.0 in⁴ (+7.6%)

Closest Iₓ in S20

S20x86

Weight
86.0 lb/ft (+30%)
Depth
20.30 in (+1.5%)
Ix
1,570.0 in⁴ (+32%)

Similar weight in S18

S18x70

Weight
70.0 lb/ft (+6.1%)
Depth
18.00 in (-10%)
Ix
923.0 in⁴ (-22%)
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Source: AISC Shapes Database v16.0 · Methodology