Steel Beam Sizes / AISC / HSS Rectangular / HSS 18x8x5/16

HSS 18x8x5/16 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 18x8x5/16 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 53.11 lb/ft 79.00 kg/m
Height 18.00 in 457.00 mm
Width 8.00 in 203.00 mm
Nominal tw 0.313 in 7.950 mm
Design tw 0.291 in 7.390 mm
Area 14.60 in² 9,420.00 mm²
Ix 604.00 in⁴ 251,000,000 mm⁴
Iy 172.00 in⁴ 71,600,000 mm⁴
Sx 67.10 in³ 1,100,000 mm³
Sy 43.00 in³ 705,000.00 mm³
Zx 83.40 in³ 1,370,000 mm³
Zy 47.50 in³ 778,000.00 mm³
rx 6.44 in 164.00 mm
ry 3.44 in 87.40 mm
J 432.00 in⁴ 180,000,000 mm⁴

Alternatives

Useful nearby sections

Same-series weight neighbors, closest Ix, and a nearby depth series when available — with percent change versus HSS 18x8x5/16.

Lighter in Rectangular HSS

HSS 22x10x1/4

Weight
53.1 lb/ft (-0.1%)
Depth
22.00 in (+22%)
Ix
923.0 in⁴ (+53%)

Heavier in Rectangular HSS

HSS 10x8x1/2

Weight
55.7 lb/ft (+4.8%)
Depth
10.00 in (-44%)
Ix
214.0 in⁴ (-65%)

Closest Iₓ in Rectangular HSS

HSS 18x6x3/8

Weight
58.1 lb/ft (+9.4%)
Depth
18.00 in (0.0%)
Ix
602.0 in⁴ (-0.3%)
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Source: AISC Shapes Database v16.0 · Methodology