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

HSS 18x18x1 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 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 222.63 lb/ft 331.00 kg/m
Height 18.00 in 457.00 mm
Width 18.00 in 457.00 mm
Nominal tw 1.000 in 25.400 mm
Design tw 0.930 in 23.600 mm
Area 61.30 in² 39,500.00 mm²
Ix 2,920.00 in⁴ 1,220,000,000 mm⁴
Iy 2,920.00 in⁴ 1,220,000,000 mm⁴
Sx 324.00 in³ 5,310,000 mm³
Sy 324.00 in³ 5,310,000 mm³
Zx 387.00 in³ 6,340,000 mm³
Zy 387.00 in³ 6,340,000 mm³
rx 6.90 in 175.00 mm
ry 6.90 in 175.00 mm
J 4,740.00 in⁴ 1,970,000,000 mm⁴

Alternatives

Useful nearby sections

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

Lighter in Square HSS

HSS 20x20x7/8

Weight
221.1 lb/ft (-0.7%)
Depth
20.00 in (+11%)
Ix
3,670.0 in⁴ (+26%)

Heavier in Square HSS

HSS 22x22x7/8

Weight
244.9 lb/ft (+10.0%)
Depth
22.00 in (+22%)
Ix
4,970.0 in⁴ (+70%)

Closest Iₓ in Square HSS

HSS 22x22x1/2

Weight
144.1 lb/ft (-35%)
Depth
22.00 in (+22%)
Ix
3,030.0 in⁴ (+3.8%)
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Source: AISC Shapes Database v16.0 · Methodology