Steel Beam Sizes / AISC / HSS Rectangular / HSS 18x8x3/8

HSS 18x8x3/8 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 18x8x3/8 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 63.21 lb/ft 94.10 kg/m
Height 18.00 in 457.00 mm
Width 8.00 in 203.00 mm
Nominal tw 0.375 in 9.530 mm
Design tw 0.349 in 8.860 mm
Area 17.30 in² 11,200.00 mm²
Ix 711.00 in⁴ 296,000,000 mm⁴
Iy 202.00 in⁴ 84,100,000 mm⁴
Sx 79.00 in³ 1,290,000 mm³
Sy 50.50 in³ 828,000.00 mm³
Zx 98.70 in³ 1,620,000 mm³
Zy 56.10 in³ 919,000.00 mm³
rx 6.40 in 163.00 mm
ry 3.41 in 86.60 mm
J 510.00 in⁴ 212,000,000 mm⁴

Alternatives

Useful nearby sections

Same-series weight neighbors, closest Ix, and a nearby depth series when available — with percent change versus HSS 18x8x3/8.

Lighter in Rectangular HSS

HSS 12x8x1/2

Weight
62.5 lb/ft (-1.2%)
Depth
12.00 in (-33%)
Ix
333.0 in⁴ (-53%)

Heavier in Rectangular HSS

HSS 22x16x1/4

Weight
63.3 lb/ft (+0.1%)
Depth
22.00 in (+22%)
Ix
1,250.0 in⁴ (+76%)

Closest Iₓ in Rectangular HSS

HSS 16x12x3/8

Weight
68.3 lb/ft (+8.1%)
Depth
16.00 in (-11%)
Ix
702.0 in⁴ (-1.3%)
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Source: AISC Shapes Database v16.0 · Methodology