Steel Beam Sizes / Europe / RHS / RHS 450×250×12.5

RHS 450×250×12.5 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 450×250×12.5 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 88.03 lb/ft 131.00 kg/m
Height 17.72 in 450.00 mm
Width 9.84 in 250.00 mm
t 0.492 in 12.500 mm
Area 25.89 in² 16,700.00 mm²
Ix 1,081.13 in⁴ 450,000,000 mm⁴
Iy 432.45 in⁴ 180,000,000 mm⁴
Sx 122.05 in³ 2,000,000 mm³
Sy 87.87 in³ 1,440,000 mm³
Zx 150.12 in³ 2,460,000 mm³
Zy 99.47 in³ 1,630,000 mm³
rx 6.46 in 164.00 mm
ry 4.09 in 104.00 mm
J 977.82 in⁴ 407,000,000 mm⁴

Alternatives

Useful nearby sections

Same-series weight neighbors, closest Ix, and a nearby depth series when available — with percent change versus RHS 450×250×12.5.

Lighter in Rectangular hollow sections

RHS 300×250×16

Weight
128.0 kg/m (-2.3%)
Depth
300.0 mm (-33%)
Ix
206,000,000 mm⁴ (-54%)

Heavier in Rectangular hollow sections

RHS 500×300×11

Weight
133.0 kg/m (+1.5%)
Depth
500.0 mm (+11%)
Ix
586,000,000 mm⁴ (+30%)

Closest Iₓ in Rectangular hollow sections

RHS 500×200×11

Weight
116.0 kg/m (-11%)
Depth
500.0 mm (+11%)
Ix
455,000,000 mm⁴ (+1.1%)
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Source: Eurocode 3 UK National Annex and ArcelorMittal Sections 2026-1 · v2026.1 · Hot-finished hollow sections · Methodology