Steel Beam Sizes / AISC / HSS Rectangular / HSS 18x8x1/2

HSS 18x8x1/2 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 18x8x1/2 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 82.88 lb/ft 123.00 kg/m
Height 18.00 in 457.00 mm
Width 8.00 in 203.00 mm
Nominal tw 0.500 in 12.700 mm
Design tw 0.465 in 11.800 mm
Area 22.80 in² 14,700.00 mm²
Ix 913.00 in⁴ 380,000,000 mm⁴
Iy 257.00 in⁴ 107,000,000 mm⁴
Sx 101.00 in³ 1,660,000 mm³
Sy 64.20 in³ 1,050,000 mm³
Zx 128.00 in³ 2,100,000 mm³
Zy 72.50 in³ 1,190,000 mm³
rx 6.33 in 161.00 mm
ry 3.36 in 85.30 mm
J 659.00 in⁴ 274,000,000 mm⁴

Alternatives

Useful nearby sections

Same-series weight neighbors, closest Ix, and a nearby depth series when available — with percent change versus HSS 18x8x1/2.

Lighter in Rectangular HSS

HSS 22x16x5/16

Weight
78.6 lb/ft (-5.1%)
Depth
22.00 in (+22%)
Ix
1,550.0 in⁴ (+70%)

Heavier in Rectangular HSS

HSS 12x10x5/8

Weight
84.8 lb/ft (+2.4%)
Depth
12.00 in (-33%)
Ix
472.0 in⁴ (-48%)

Closest Iₓ in Rectangular HSS

HSS 16x12x1/2

Weight
89.7 lb/ft (+8.2%)
Depth
16.00 in (-11%)
Ix
904.0 in⁴ (-1.0%)
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Source: AISC Shapes Database v16.0 · Methodology