Steel Beam Sizes / UK / Universal Beams / UB 305×127×42

UB 305×127×42 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 305×127×42 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 28.16 lb/ft 41.90 kg/m
Depth, d 12.09 in 307.20 mm
Flange width, bf 4.89 in 124.30 mm
tw 0.315 in 8.000 mm
tf 0.476 in 12.100 mm
Area 8.28 in² 5,340.00 mm²
Ix 197.01 in⁴ 82,000,000 mm⁴
Iy 9.35 in⁴ 3,890,000 mm⁴
Sx 32.59 in³ 534,000.00 mm³
Sy 3.84 in³ 63,000.00 mm³
Zx 37.47 in³ 614,000.00 mm³
Zy 6.00 in³ 98,400.00 mm³
rx 4.88 in 124.00 mm
ry 1.06 in 27.00 mm
J 0.51 in⁴ 211,000.00 mm⁴
Cw 313.92 in⁶ 84,300,000,000 mm⁶

Alternatives

Useful nearby sections

Same-series weight neighbors, closest Ix, and a nearby depth series when available — with percent change versus UB 305×127×42.

Lighter in Universal beams

UB 305×165×40

Weight
40.3 kg/m (-3.8%)
Depth
303.4 mm (-1.2%)
Ix
85,000,000 mm⁴ (+3.7%)

Heavier in Universal beams

UB 254×146×43

Weight
43.0 kg/m (+2.6%)
Depth
259.6 mm (-15%)
Ix
65,400,000 mm⁴ (-20%)

Closest Iₓ in Universal beams

UB 356×127×33

Weight
33.1 kg/m (-21%)
Depth
349.0 mm (+14%)
Ix
82,500,000 mm⁴ (+0.6%)
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Source: British-Sections-1 and Eurocode 3 UK shared angle/hollow tables · v2023.11 · Methodology