Steel Beam Sizes / UK / Universal Beams / UB 305×102×25

UB 305×102×25 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 305×102×25 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 16.66 lb/ft 24.80 kg/m
Depth, d 12.01 in 305.10 mm
Flange width, bf 4.00 in 101.60 mm
tw 0.228 in 5.800 mm
tf 0.276 in 7.000 mm
Area 4.90 in² 3,160.00 mm²
Ix 107.15 in⁴ 44,600,000 mm⁴
Iy 2.96 in⁴ 1,230,000 mm⁴
Sx 17.82 in³ 292,000.00 mm³
Sy 1.46 in³ 24,000.00 mm³
Zx 20.87 in³ 342,000.00 mm³
Zy 2.37 in³ 38,800.00 mm³
rx 4.69 in 119.00 mm
ry 0.78 in 19.70 mm
J 0.11 in⁴ 47,700.00 mm⁴
Cw 101.29 in⁶ 27,200,000,000 mm⁶

Alternatives

Useful nearby sections

Same-series weight neighbors, closest Ix, and a nearby depth series when available — with percent change versus UB 305×102×25.

Lighter in Universal beams

UB 203×102×23

Weight
23.1 kg/m (-6.9%)
Depth
203.2 mm (-33%)
Ix
21,000,000 mm⁴ (-53%)

Heavier in Universal beams

UB 203×133×25

Weight
25.1 kg/m (+1.2%)
Depth
203.2 mm (-33%)
Ix
23,400,000 mm⁴ (-48%)

Closest Iₓ in Universal beams

UB 254×146×31

Weight
31.1 kg/m (+25%)
Depth
251.4 mm (-18%)
Ix
44,100,000 mm⁴ (-1.1%)
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Source: British-Sections-1 and Eurocode 3 UK shared angle/hollow tables · v2023.11 · Methodology