Steel Beam Sizes / UK / Universal Beams / UB 686×254×125

UB 686×254×125 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 686×254×125 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 84.00 lb/ft 125.00 kg/m
Depth, d 26.69 in 677.90 mm
Flange width, bf 9.96 in 253.00 mm
tw 0.461 in 11.700 mm
tf 0.638 in 16.200 mm
Area 24.80 in² 16,000.00 mm²
Ix 2,834.96 in⁴ 1,180,000,000 mm⁴
Iy 105.23 in⁴ 43,800,000 mm⁴
Sx 212.36 in³ 3,480,000 mm³
Sy 21.11 in³ 346,000.00 mm³
Zx 243.48 in³ 3,990,000 mm³
Zy 33.07 in³ 542,000.00 mm³
rx 10.71 in 272.00 mm
ry 2.06 in 52.40 mm
J 2.79 in⁴ 1,160,000 mm⁴
Cw 17,837.47 in⁶ 4,790,000,000,000 mm⁶

Alternatives

Useful nearby sections

Same-series weight neighbors, closest Ix, and a nearby depth series when available — with percent change versus UB 686×254×125.

Lighter in Universal beams

UB 533×210×122

Weight
122.0 kg/m (-2.4%)
Depth
544.5 mm (-20%)
Ix
760,000,000 mm⁴ (-36%)

Heavier in Universal beams

UB 762×267×134

Weight
134.0 kg/m (+7.2%)
Depth
750.0 mm (+11%)
Ix
1,510,000,000 mm⁴ (+28%)

Closest Iₓ in Universal beams

UB 610×229×140

Weight
140.0 kg/m (+12%)
Depth
617.2 mm (-9.0%)
Ix
1,120,000,000 mm⁴ (-5.1%)
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Source: British-Sections-1 and Eurocode 3 UK shared angle/hollow tables · v2023.11 · Methodology