Steel Beam Sizes / UK / Universal Beams / UB 406×178×85

UB 406×178×85 Steel Beam Dimensions and Properties

UK Universal beams · v2023.11

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

Units

Section diagram

UB 406×178×85 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 57.12 lb/ft 85.00 kg/m
Depth, d 16.42 in 417.00 mm
Flange width, bf 7.13 in 181.00 mm
tw 0.429 in 10.900 mm
tf 0.717 in 18.200 mm
Area 16.74 in² 10,800.00 mm²
Ix 756.79 in⁴ 315,000,000 mm⁴
Iy 43.25 in⁴ 18,000,000 mm⁴
Sx 92.15 in³ 1,510,000 mm³
Sy 12.14 in³ 199,000.00 mm³
Zx 104.96 in³ 1,720,000 mm³
Zy 18.92 in³ 310,000.00 mm³
rx 6.73 in 171.00 mm
ry 1.61 in 40.80 mm
J 2.22 in⁴ 926,000.00 mm⁴
Cw 2,662.59 in⁶ 715,000,000,000 mm⁶

Alternatives

Useful nearby sections

Same-series weight neighbors, closest Ix, and a nearby depth series when available — with percent change versus UB 406×178×85.

Lighter in Universal beams

UB 533×210×82

Weight
82.2 kg/m (-3.3%)
Depth
528.3 mm (+27%)
Ix
475,000,000 mm⁴ (+51%)

Heavier in Universal beams

UB 457×191×89

Weight
89.3 kg/m (+5.1%)
Depth
463.4 mm (+11%)
Ix
410,000,000 mm⁴ (+30%)

Closest Iₓ in Universal beams

UB 457×152×74

Weight
74.2 kg/m (-13%)
Depth
462.0 mm (+11%)
Ix
327,000,000 mm⁴ (+3.8%)
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Source: British-Sections-1 and Eurocode 3 UK shared angle/hollow tables · v2023.11 · Methodology