Steel Beam Sizes / AISC / HSS Square / HSS 18x18x1/2

HSS 18x18x1/2 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 18x18x1/2 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 116.91 lb/ft 174.00 kg/m
Height 18.00 in 457.00 mm
Width 18.00 in 457.00 mm
Nominal tw 0.500 in 12.700 mm
Design tw 0.465 in 11.800 mm
Area 32.10 in² 20,700.00 mm²
Ix 1,630.00 in⁴ 678,000,000 mm⁴
Iy 1,630.00 in⁴ 678,000,000 mm⁴
Sx 181.00 in³ 2,970,000 mm³
Sy 181.00 in³ 2,970,000 mm³
Zx 210.00 in³ 3,440,000 mm³
Zy 210.00 in³ 3,440,000 mm³
rx 7.13 in 181.00 mm
ry 7.13 in 181.00 mm
J 2,540.00 in⁴ 1,060,000,000 mm⁴

Alternatives

Useful nearby sections

Same-series weight neighbors, closest Ix, and a nearby depth series when available — with percent change versus HSS 18x18x1/2.

Lighter in Square HSS

HSS 14x14x5/8

Weight
110.4 lb/ft (-5.6%)
Depth
14.00 in (-22%)
Ix
897.0 in⁴ (-45%)

Heavier in Square HSS

HSS 12x12x7/8

Weight
125.8 lb/ft (+7.6%)
Depth
12.00 in (-33%)
Ix
706.0 in⁴ (-57%)

Closest Iₓ in Square HSS

HSS 16x16x3/4

Weight
150.8 lb/ft (+29%)
Depth
16.00 in (-11%)
Ix
1,590.0 in⁴ (-2.5%)
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Source: AISC Shapes Database v16.0 · Methodology