Steel Beam Sizes / AISC / HSS Square / HSS 18x18x3/4

HSS 18x18x3/4 Steel Beam Dimensions and Properties

AISC Square HSS · v16.0

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

Units

Section diagram

HSS 18x18x3/4 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 171.16 lb/ft 255.00 kg/m
Height 18.00 in 457.00 mm
Width 18.00 in 457.00 mm
Nominal tw 0.750 in 19.100 mm
Design tw 0.698 in 17.700 mm
Area 47.10 in² 30,400.00 mm²
Ix 2,320.00 in⁴ 966,000,000 mm⁴
Iy 2,320.00 in⁴ 966,000,000 mm⁴
Sx 258.00 in³ 4,230,000 mm³
Sy 258.00 in³ 4,230,000 mm³
Zx 302.00 in³ 4,950,000 mm³
Zy 302.00 in³ 4,950,000 mm³
rx 7.02 in 178.00 mm
ry 7.02 in 178.00 mm
J 3,690.00 in⁴ 1,540,000,000 mm⁴

Alternatives

Useful nearby sections

Same-series weight neighbors, closest Ix, and a nearby depth series when available — with percent change versus HSS 18x18x3/4.

Lighter in Square HSS

HSS 14x14x1

Weight
168.2 lb/ft (-1.7%)
Depth
14.00 in (-22%)
Ix
1,290.0 in⁴ (-44%)

Heavier in Square HSS

HSS 16x16x7/8

Weight
173.4 lb/ft (+1.3%)
Depth
16.00 in (-11%)
Ix
1,800.0 in⁴ (-22%)

Closest Iₓ in Square HSS

HSS 20x20x1/2

Weight
130.5 lb/ft (-24%)
Depth
20.00 in (+11%)
Ix
2,260.0 in⁴ (-2.6%)
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Source: AISC Shapes Database v16.0 · Methodology