Steel Beam Sizes / Europe / RHS / RHS 180×100×12.5

RHS 180×100×12.5 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 180×100×12.5 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 32.72 lb/ft 48.70 kg/m
Height 7.09 in 180.00 mm
Width 3.94 in 100.00 mm
t 0.492 in 12.500 mm
Area 9.63 in² 6,210.00 mm²
Ix 57.18 in⁴ 23,800,000 mm⁴
Iy 21.81 in⁴ 9,080,000 mm⁴
Sx 16.17 in³ 265,000.00 mm³
Sy 11.11 in³ 182,000.00 mm³
Zx 20.99 in³ 344,000.00 mm³
Zy 13.61 in³ 223,000.00 mm³
rx 2.44 in 62.00 mm
ry 1.50 in 38.20 mm
J 52.61 in⁴ 21,900,000 mm⁴

Alternatives

Useful nearby sections

Same-series weight neighbors, closest Ix, and a nearby depth series when available — with percent change versus RHS 180×100×12.5.

Lighter in Rectangular hollow sections

RHS 300×200×6.3

Weight
47.9 kg/m (-1.6%)
Depth
300.0 mm (+67%)
Ix
78,300,000 mm⁴ (+229%)

Heavier in Rectangular hollow sections

RHS 220×120×10

Weight
49.4 kg/m (+1.4%)
Depth
220.0 mm (+22%)
Ix
38,400,000 mm⁴ (+61%)

Closest Iₓ in Rectangular hollow sections

RHS 200×100×8.8

Weight
38.4 kg/m (-21%)
Depth
200.0 mm (+11%)
Ix
24,100,000 mm⁴ (+1.3%)
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Source: Eurocode 3 UK National Annex and ArcelorMittal Sections 2026-1 · v2026.1 · Hot-finished hollow sections · Methodology