Steel Beam Sizes / AISC / HSS Rectangular / HSS 18x8x5/8

HSS 18x8x5/8 Steel Beam Dimensions and Properties

AISC Rectangular HSS · v16.0

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Diagram, properties emphasis, and nearby alternatives use the selected unit system.

Units

Section diagram

HSS 18x8x5/8 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 101.85 lb/ft 152.00 kg/m
Height 18.00 in 457.00 mm
Width 8.00 in 203.00 mm
Nominal tw 0.625 in 15.900 mm
Design tw 0.581 in 14.800 mm
Area 28.00 in² 18,100.00 mm²
Ix 1,100.00 in⁴ 458,000,000 mm⁴
Iy 306.00 in⁴ 127,000,000 mm⁴
Sx 122.00 in³ 2,000,000 mm³
Sy 76.60 in³ 1,260,000 mm³
Zx 156.00 in³ 2,560,000 mm³
Zy 87.80 in³ 1,440,000 mm³
rx 6.27 in 159.00 mm
ry 3.31 in 84.10 mm
J 797.00 in⁴ 332,000,000 mm⁴

Alternatives

Useful nearby sections

Same-series weight neighbors, closest Ix, and a nearby depth series when available — with percent change versus HSS 18x8x5/8.

Lighter in Rectangular HSS

HSS 22x18x3/8

Weight
98.9 lb/ft (-2.9%)
Depth
22.00 in (+22%)
Ix
2,000.0 in⁴ (+82%)

Heavier in Rectangular HSS

HSS 20x12x1/2

Weight
103.3 lb/ft (+1.4%)
Depth
20.00 in (+11%)
Ix
1,550.0 in⁴ (+41%)

Closest Iₓ in Rectangular HSS

HSS 16x12x5/8

Weight
110.4 lb/ft (+8.4%)
Depth
16.00 in (-11%)
Ix
1,090.0 in⁴ (-0.9%)
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Source: AISC Shapes Database v16.0 · Methodology