Steel Beam Sizes / Europe / RHS / RHS 400×300×12.5

RHS 400×300×12.5 Steel Beam Dimensions and Properties

EN Rectangular hollow sections · v2026.1

Analyze in Beam Calculator Back to RHS

Diagram, properties emphasis, and nearby alternatives use the selected unit system.

Units

Section diagram

RHS 400×300×12.5 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 15.75 in 400.00 mm
Width 11.81 in 300.00 mm
t 0.492 in 12.500 mm
Area 25.89 in² 16,700.00 mm²
Ix 924.97 in⁴ 385,000,000 mm⁴
Iy 591.02 in⁴ 246,000,000 mm⁴
Sx 117.17 in³ 1,920,000 mm³
Sy 100.08 in³ 1,640,000 mm³
Zx 140.35 in³ 2,300,000 mm³
Zy 114.72 in³ 1,880,000 mm³
rx 5.98 in 152.00 mm
ry 4.76 in 121.00 mm
J 1,124.37 in⁴ 468,000,000 mm⁴

Alternatives

Useful nearby sections

Same-series weight neighbors, closest Ix, and a nearby depth series when available — with percent change versus RHS 400×300×12.5.

Lighter in Rectangular hollow sections

RHS 300×250×16

Weight
128.0 kg/m (-2.3%)
Depth
300.0 mm (-25%)
Ix
206,000,000 mm⁴ (-46%)

Heavier in Rectangular hollow sections

RHS 500×300×11

Weight
133.0 kg/m (+1.5%)
Depth
500.0 mm (+25%)
Ix
586,000,000 mm⁴ (+52%)

Closest Iₓ in Rectangular hollow sections

RHS 500×200×8.8

Weight
93.6 kg/m (-29%)
Depth
500.0 mm (+25%)
Ix
372,000,000 mm⁴ (-3.4%)
Analyze in Beam Calculator Compare in RHS finder

Source: Eurocode 3 UK National Annex and ArcelorMittal Sections 2026-1 · v2026.1 · Hot-finished hollow sections · Methodology