Steel Beam Sizes / Australia / Universal Beams / 250 UB 31

250 UB 31 Steel Beam Dimensions and Properties

ASNZS Universal beams · v2019.11

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

Units

Section diagram

250 UB 31 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 20.83 lb/ft 31.00 kg/m
Depth, d 9.90 in 251.50 mm
Flange width, bf 5.75 in 146.10 mm
tw 0.240 in 6.100 mm
tf 0.340 in 8.640 mm
Area 6.20 in² 4,000.00 mm²
Ix 106.67 in⁴ 44,400,000 mm⁴
Iy 10.79 in⁴ 4,490,000 mm⁴
Sx 21.55 in³ 353,081.51 mm³
Sy 3.75 in³ 61,464.75 mm³
Zx 24.17 in³ 396,000.00 mm³
Zy 5.77 in³ 94,500.00 mm³
rx 4.15 in 105.36 mm
ry 1.32 in 33.50 mm
J 0.21 in⁴ 87,300.00 mm⁴
Cw 246.52 in⁶ 66,199,998,464 mm⁶

Alternatives

Useful nearby sections

Same-series weight neighbors, closest Ix, and a nearby depth series when available — with percent change versus 250 UB 31.

Lighter in Universal beams

200 UB 30

Weight
30.0 kg/m (-3.2%)
Depth
206.8 mm (-18%)
Ix
28,900,000 mm⁴ (-35%)

Heavier in Universal beams

250 UB 37

Weight
37.0 kg/m (+19%)
Depth
256.0 mm (+1.8%)
Ix
55,600,000 mm⁴ (+25%)

Closest Iₓ in Universal beams

250 UB 26

Weight
26.0 kg/m (-16%)
Depth
248.0 mm (-1.4%)
Ix
35,400,000 mm⁴ (-20%)
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Source: Australian-Sections.xlsx (Sheets 1-19) · v2019.11 · Methodology