Steel Beam Sizes / UK / RHS / RHS 300×250×12.5

RHS 300×250×12.5 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 300×250×12.5 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 68.54 lb/ft 102.00 kg/m
Height 11.81 in 300.00 mm
Width 9.84 in 250.00 mm
t 0.492 in 12.500 mm
Area 20.15 in² 13,000.00 mm²
Ix 406.02 in⁴ 169,000,000 mm⁴
Iy 305.12 in⁴ 127,000,000 mm⁴
Sx 68.35 in³ 1,120,000 mm³
Sy 61.63 in³ 1,010,000 mm³
Zx 81.77 in³ 1,340,000 mm³
Zy 72.01 in³ 1,180,000 mm³
rx 4.49 in 114.00 mm
ry 3.89 in 98.90 mm
J 545.37 in⁴ 227,000,000 mm⁴

Alternatives

Useful nearby sections

Same-series weight neighbors, closest Ix, and a nearby depth series when available — with percent change versus RHS 300×250×12.5.

Lighter in Rectangular hollow sections

RHS 260×180×16

Weight
100.0 kg/m (-2.0%)
Depth
260.0 mm (-13%)
Ix
112,000,000 mm⁴ (-34%)

Heavier in Rectangular hollow sections

RHS 300×200×14.2

Weight
103.0 kg/m (+1.0%)
Depth
300.0 mm (0.0%)
Ix
158,000,000 mm⁴ (-6.5%)

Closest Iₓ in Rectangular hollow sections

RHS 350×200×10

Weight
82.4 kg/m (-19%)
Depth
350.0 mm (+17%)
Ix
172,000,000 mm⁴ (+1.8%)
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Source: British-Sections-1 and Eurocode 3 UK shared angle/hollow tables · v2023.11 · Hot-finished hollow sections · Methodology