Steel Beam Sizes / AISC / HSS Square / HSS 18x18x1/4

HSS 18x18x1/4 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 18x18x1/4 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 59.85 lb/ft 89.10 kg/m
Height 18.00 in 457.00 mm
Width 18.00 in 457.00 mm
Nominal tw 0.250 in 6.350 mm
Design tw 0.233 in 5.920 mm
Area 16.40 in² 10,600.00 mm²
Ix 860.00 in⁴ 358,000,000 mm⁴
Iy 860.00 in⁴ 358,000,000 mm⁴
Sx 95.60 in³ 1,570,000 mm³
Sy 95.60 in³ 1,570,000 mm³
Zx 109.00 in³ 1,790,000 mm³
Zy 109.00 in³ 1,790,000 mm³
rx 7.24 in 184.00 mm
ry 7.24 in 184.00 mm
J 1,320.00 in⁴ 549,000,000 mm⁴

Alternatives

Useful nearby sections

Same-series weight neighbors, closest Ix, and a nearby depth series when available — with percent change versus HSS 18x18x1/4.

Lighter in Square HSS

HSS 8x8x5/8

Weight
59.3 lb/ft (-0.9%)
Depth
8.00 in (-56%)
Ix
146.0 in⁴ (-83%)

Heavier in Square HSS

HSS 10x10x1/2

Weight
62.5 lb/ft (+4.4%)
Depth
10.00 in (-44%)
Ix
256.0 in⁴ (-70%)

Closest Iₓ in Square HSS

HSS 16x16x3/8

Weight
78.5 lb/ft (+31%)
Depth
16.00 in (-11%)
Ix
873.0 in⁴ (+1.5%)
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Source: AISC Shapes Database v16.0 · Methodology