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RHS 80×40×8 Steel Beam Dimensions and Properties

EN Rectangular hollow sections · v2026.1

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

Units

Section diagram

RHS 80×40×8 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 8.40 lb/ft 12.50 kg/m
Height 3.15 in 80.00 mm
Width 1.57 in 40.00 mm
t 0.315 in 8.000 mm
Area 2.48 in² 1,600.00 mm²
Ix 2.55 in⁴ 1,060,000 mm⁴
Iy 0.77 in⁴ 321,000.00 mm⁴
Sx 1.62 in³ 26,500.00 mm³
Sy 0.98 in³ 16,100.00 mm³
Zx 2.23 in³ 36,500.00 mm³
Zy 1.29 in³ 21,200.00 mm³
rx 1.02 in 25.80 mm
ry 0.56 in 14.20 mm
J 2.06 in⁴ 858,000.00 mm⁴

Alternatives

Useful nearby sections

Same-series weight neighbors, closest Ix, and a nearby depth series when available — with percent change versus RHS 80×40×8.

Lighter in Rectangular hollow sections

RHS 90×50×6.3

Weight
12.3 kg/m (-1.6%)
Depth
90.0 mm (+13%)
Ix
1,500,000 mm⁴ (+42%)

Heavier in Rectangular hollow sections

RHS 100×60×5.6

Weight
12.8 kg/m (+2.4%)
Depth
100.0 mm (+25%)
Ix
2,060,000 mm⁴ (+94%)

Closest Iₓ in Rectangular hollow sections

RHS 90×50×4

Weight
8.2 kg/m (-35%)
Depth
90.0 mm (+13%)
Ix
1,070,000 mm⁴ (+0.9%)
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Source: Eurocode 3 UK National Annex and ArcelorMittal Sections 2026-1 · v2026.1 · Hot-finished hollow sections · Methodology