Steel Beam Sizes / UK / Universal Beams / UB 686×254×170

UB 686×254×170 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 686×254×170 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 114.23 lb/ft 170.00 kg/m
Depth, d 27.28 in 692.90 mm
Flange width, bf 10.07 in 255.80 mm
tw 0.571 in 14.500 mm
tf 0.933 in 23.700 mm
Area 33.64 in² 21,700.00 mm²
Ix 4,084.27 in⁴ 1,700,000,000 mm⁴
Iy 159.29 in⁴ 66,300,000 mm⁴
Sx 300.24 in³ 4,920,000 mm³
Sy 31.61 in³ 518,000.00 mm³
Zx 343.56 in³ 5,630,000 mm³
Zy 49.49 in³ 811,000.00 mm³
rx 11.02 in 280.00 mm
ry 2.18 in 55.30 mm
J 7.40 in⁴ 3,080,000 mm⁴
Cw 27,556.84 in⁶ 7,400,000,000,000 mm⁶

Alternatives

Useful nearby sections

Same-series weight neighbors, closest Ix, and a nearby depth series when available — with percent change versus UB 686×254×170.

Lighter in Universal beams

UB 610×229×153

Weight
153.0 kg/m (-10%)
Depth
623.0 mm (-10%)
Ix
1,250,000,000 mm⁴ (-26%)

Heavier in Universal beams

UB 762×267×173

Weight
173.0 kg/m (+1.8%)
Depth
762.2 mm (+10%)
Ix
2,050,000,000 mm⁴ (+21%)

Closest Iₓ in Universal beams

UB 762×267×147

Weight
147.0 kg/m (-14%)
Depth
754.0 mm (+8.8%)
Ix
1,680,000,000 mm⁴ (-1.2%)
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Source: British-Sections-1 and Eurocode 3 UK shared angle/hollow tables · v2023.11 · Methodology