Steel Beam Sizes / AISC / HSS Square / HSS 18x18x7/8

HSS 18x18x7/8 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 18x18x7/8 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 197.24 lb/ft 293.00 kg/m
Height 18.00 in 457.00 mm
Width 18.00 in 457.00 mm
Nominal tw 0.875 in 22.200 mm
Design tw 0.814 in 20.700 mm
Area 54.30 in² 35,000.00 mm²
Ix 2,630.00 in⁴ 1,090,000,000 mm⁴
Iy 2,630.00 in⁴ 1,090,000,000 mm⁴
Sx 292.00 in³ 4,790,000 mm³
Sy 292.00 in³ 4,790,000 mm³
Zx 346.00 in³ 5,670,000 mm³
Zy 346.00 in³ 5,670,000 mm³
rx 6.96 in 177.00 mm
ry 6.96 in 177.00 mm
J 4,220.00 in⁴ 1,760,000,000 mm⁴

Alternatives

Useful nearby sections

Same-series weight neighbors, closest Ix, and a nearby depth series when available — with percent change versus HSS 18x18x7/8.

Lighter in Square HSS

HSS 16x16x1

Weight
195.4 lb/ft (-0.9%)
Depth
16.00 in (-11%)
Ix
1,990.0 in⁴ (-24%)

Heavier in Square HSS

HSS 22x22x3/4

Weight
212.0 lb/ft (+7.5%)
Depth
22.00 in (+22%)
Ix
4,350.0 in⁴ (+65%)

Closest Iₓ in Square HSS

HSS 20x20x5/8

Weight
161.4 lb/ft (-18%)
Depth
20.00 in (+11%)
Ix
2,750.0 in⁴ (+4.6%)
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Source: AISC Shapes Database v16.0 · Methodology