Steel Beam Sizes / UK / RHS / RHS 300×100×12.5

RHS 300×100×12.5 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 300×100×12.5 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 48.58 lb/ft 72.30 kg/m
Height 11.81 in 300.00 mm
Width 3.94 in 100.00 mm
t 0.492 in 12.500 mm
Area 14.28 in² 9,210.00 mm²
Ix 218.63 in⁴ 91,000,000 mm⁴
Iy 35.80 in⁴ 14,900,000 mm⁴
Sx 37.04 in³ 607,000.00 mm³
Sy 18.12 in³ 297,000.00 mm³
Zx 49.19 in³ 806,000.00 mm³
Zy 21.60 in³ 354,000.00 mm³
rx 3.91 in 99.40 mm
ry 1.58 in 40.20 mm
J 104.51 in⁴ 43,500,000 mm⁴

Alternatives

Useful nearby sections

Same-series weight neighbors, closest Ix, and a nearby depth series when available — with percent change versus RHS 300×100×12.5.

Lighter in Rectangular hollow sections

RHS 260×180×11

Weight
71.2 kg/m (-1.5%)
Depth
260.0 mm (-13%)
Ix
83,800,000 mm⁴ (-7.9%)

Heavier in Rectangular hollow sections

RHS 350×250×8

Weight
72.8 kg/m (+0.7%)
Depth
350.0 mm (+17%)
Ix
164,000,000 mm⁴ (+80%)

Closest Iₓ in Rectangular hollow sections

RHS 300×250×6.3

Weight
52.8 kg/m (-27%)
Depth
300.0 mm (0.0%)
Ix
91,900,000 mm⁴ (+1.0%)
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Source: British-Sections-1 and Eurocode 3 UK shared angle/hollow tables · v2023.11 · Hot-finished hollow sections · Methodology