Steel Beam Sizes / AISC / HSS Square / HSS 18x18x5/8

HSS 18x18x5/8 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 18x18x5/8 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 144.39 lb/ft 215.00 kg/m
Height 18.00 in 457.00 mm
Width 18.00 in 457.00 mm
Nominal tw 0.625 in 15.900 mm
Design tw 0.581 in 14.800 mm
Area 39.60 in² 25,500.00 mm²
Ix 1,980.00 in⁴ 824,000,000 mm⁴
Iy 1,980.00 in⁴ 824,000,000 mm⁴
Sx 220.00 in³ 3,610,000 mm³
Sy 220.00 in³ 3,610,000 mm³
Zx 257.00 in³ 4,210,000 mm³
Zy 257.00 in³ 4,210,000 mm³
rx 7.07 in 180.00 mm
ry 7.07 in 180.00 mm
J 3,120.00 in⁴ 1,300,000,000 mm⁴

Alternatives

Useful nearby sections

Same-series weight neighbors, closest Ix, and a nearby depth series when available — with percent change versus HSS 18x18x5/8.

Lighter in Square HSS

HSS 22x22x1/2

Weight
144.1 lb/ft (-0.2%)
Depth
22.00 in (+22%)
Ix
3,030.0 in⁴ (+53%)

Heavier in Square HSS

HSS 14x14x7/8

Weight
149.6 lb/ft (+3.6%)
Depth
14.00 in (-22%)
Ix
1,170.0 in⁴ (-41%)

Closest Iₓ in Square HSS

HSS 16x16x1

Weight
195.4 lb/ft (+35%)
Depth
16.00 in (-11%)
Ix
1,990.0 in⁴ (+0.5%)
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Source: AISC Shapes Database v16.0 · Methodology