Steel Beam Sizes / UK / RHS / RHS 120×80×5

RHS 120×80×5 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 120×80×5 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 9.88 lb/ft 14.70 kg/m
Height 4.72 in 120.00 mm
Width 3.15 in 80.00 mm
t 0.197 in 5.000 mm
Area 2.90 in² 1,870.00 mm²
Ix 8.77 in⁴ 3,650,000 mm⁴
Iy 4.64 in⁴ 1,930,000 mm⁴
Sx 3.72 in³ 60,900.00 mm³
Sy 2.94 in³ 48,200.00 mm³
Zx 4.55 in³ 74,600.00 mm³
Zy 3.42 in³ 56,100.00 mm³
rx 1.74 in 44.20 mm
ry 1.26 in 32.10 mm
J 9.63 in⁴ 4,010,000 mm⁴

Alternatives

Useful nearby sections

Same-series weight neighbors, closest Ix, and a nearby depth series when available — with percent change versus RHS 120×80×5.

Lighter in Rectangular hollow sections

RHS 120×60×5.6

Weight
14.6 kg/m (-0.7%)
Depth
120.0 mm (0.0%)
Ix
3,270,000 mm⁴ (-10%)

Heavier in Rectangular hollow sections

RHS 90×50×8

Weight
15.0 kg/m (+2.0%)
Depth
90.0 mm (-25%)
Ix
1,740,000 mm⁴ (-52%)

Closest Iₓ in Rectangular hollow sections

RHS 120×60×6.3

Weight
16.2 kg/m (+10%)
Depth
120.0 mm (0.0%)
Ix
3,580,000 mm⁴ (-1.9%)
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Source: British-Sections-1 and Eurocode 3 UK shared angle/hollow tables · v2023.11 · Hot-finished hollow sections · Methodology