Steel Beam Sizes / UK / RHS / RHS 80×40×7.1

RHS 80×40×7.1 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 80×40×7.1 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 7.66 lb/ft 11.40 kg/m
Height 3.15 in 80.00 mm
Width 1.57 in 40.00 mm
t 0.280 in 7.100 mm
Area 2.25 in² 1,450.00 mm²
Ix 2.40 in⁴ 998,000.00 mm⁴
Iy 0.74 in⁴ 307,000.00 mm⁴
Sx 1.53 in³ 25,000.00 mm³
Sy 0.94 in³ 15,400.00 mm³
Zx 2.06 in³ 33,800.00 mm³
Zy 1.21 in³ 19,800.00 mm³
rx 1.04 in 26.30 mm
ry 0.57 in 14.60 mm
J 1.94 in⁴ 809,000.00 mm⁴

Alternatives

Useful nearby sections

Same-series weight neighbors, closest Ix, and a nearby depth series when available — with percent change versus RHS 80×40×7.1.

Lighter in Rectangular hollow sections

RHS 90×50×5.6

Weight
11.1 kg/m (-2.6%)
Depth
90.0 mm (+13%)
Ix
1,380,000 mm⁴ (+38%)

Heavier in Rectangular hollow sections

RHS 100×60×5

Weight
11.6 kg/m (+1.8%)
Depth
100.0 mm (+25%)
Ix
1,890,000 mm⁴ (+89%)

Closest Iₓ in Rectangular hollow sections

RHS 90×50×3.6

Weight
7.4 kg/m (-35%)
Depth
90.0 mm (+13%)
Ix
983,000 mm⁴ (-1.5%)
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Source: British-Sections-1 and Eurocode 3 UK shared angle/hollow tables · v2023.11 · Hot-finished hollow sections · Methodology