Steel Beam Sizes / UK / RHS / RHS 80×40×4

RHS 80×40×4 Steel Beam Dimensions and Properties

UK Rectangular hollow sections · v2023.11

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

Units

Section diagram

RHS 80×40×4 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 4.64 lb/ft 6.90 kg/m
Height 3.15 in 80.00 mm
Width 1.57 in 40.00 mm
t 0.157 in 4.000 mm
Area 1.36 in² 879.00 mm²
Ix 1.64 in⁴ 682,000.00 mm⁴
Iy 0.53 in⁴ 222,000.00 mm⁴
Sx 1.04 in³ 17,100.00 mm³
Sy 0.68 in³ 11,100.00 mm³
Zx 1.33 in³ 21,800.00 mm³
Zy 0.81 in³ 13,200.00 mm³
rx 1.10 in 27.90 mm
ry 0.63 in 15.90 mm
J 1.33 in⁴ 552,000.00 mm⁴

Alternatives

Useful nearby sections

Same-series weight neighbors, closest Ix, and a nearby depth series when available — with percent change versus RHS 80×40×4.

Lighter in Rectangular hollow sections

RHS 60×40×5

Weight
6.9 kg/m (-0.7%)
Depth
60.0 mm (-25%)
Ix
381,000 mm⁴ (-44%)

Heavier in Rectangular hollow sections

RHS 100×50×3.2

Weight
7.1 kg/m (+3.3%)
Depth
100.0 mm (+25%)
Ix
1,160,000 mm⁴ (+70%)

Closest Iₓ in Rectangular hollow sections

RHS 80×40×3.6

Weight
6.3 kg/m (-9.1%)
Depth
80.0 mm (0.0%)
Ix
628,000 mm⁴ (-7.9%)
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Source: British-Sections-1 and Eurocode 3 UK shared angle/hollow tables · v2023.11 · Hot-finished hollow sections · Methodology