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RHS 400×300×8 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 400×300×8 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 57.39 lb/ft 85.40 kg/m
Height 15.75 in 400.00 mm
Width 11.81 in 300.00 mm
t 0.315 in 8.000 mm
Area 16.90 in² 10,900.00 mm²
Ix 617.44 in⁴ 257,000,000 mm⁴
Iy 396.41 in⁴ 165,000,000 mm⁴
Sx 78.11 in³ 1,280,000 mm³
Sy 67.13 in³ 1,100,000 mm³
Zx 92.76 in³ 1,520,000 mm³
Zy 76.28 in³ 1,250,000 mm³
rx 6.06 in 154.00 mm
ry 4.84 in 123.00 mm
J 744.78 in⁴ 310,000,000 mm⁴

Alternatives

Useful nearby sections

Same-series weight neighbors, closest Ix, and a nearby depth series when available — with percent change versus RHS 400×300×8.

Lighter in Rectangular hollow sections

RHS 300×250×10

Weight
82.4 kg/m (-3.5%)
Depth
300.0 mm (-25%)
Ix
139,000,000 mm⁴ (-46%)

Heavier in Rectangular hollow sections

RHS 260×180×14.2

Weight
90.1 kg/m (+5.5%)
Depth
260.0 mm (-35%)
Ix
103,000,000 mm⁴ (-60%)

Closest Iₓ in Rectangular hollow sections

RHS 350×200×16

Weight
128.0 kg/m (+50%)
Depth
350.0 mm (-12%)
Ix
255,000,000 mm⁴ (-0.8%)
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Source: Eurocode 3 UK National Annex and ArcelorMittal Sections 2026-1 · v2026.1 · Hot-finished hollow sections · Methodology