Steel Beam Sizes / AISC / Double Angles / 2L8x4x1/2x3/4LLBB

2L8x4x1/2x3/4LLBB Steel Beam Dimensions and Properties

AISC Double angles · v16.0

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

Units

Section diagram

2L8x4x1/2x3/4LLBB 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 39.20 lb/ft 58.40 kg/m
Width 4.00 in 102.00 mm
Height 8.00 in 203.00 mm
t 0.500 in 12.700 mm
Area 11.60 in² 7,480.00 mm²
Ix 77.20 in⁴ 32,100,000 mm⁴
Sx 15.00 in³ 246,000.00 mm³
rx 2.58 in 65.50 mm

Alternatives

Useful nearby sections

Same-series weight neighbors, closest Ix, and a nearby depth series when available — with percent change versus 2L8x4x1/2x3/4LLBB.

Lighter in Double angles

2L4x4x3/4

Weight
37.0 lb/ft (-5.6%)
Depth
4.00 in (-50%)
Ix
15.2 in⁴ (-80%)

Heavier in Double angles

2L5x3-1/2x3/4LLBB

Weight
39.6 lb/ft (+1.0%)
Depth
5.00 in (-38%)
Ix
27.8 in⁴ (-64%)

Closest Iₓ in Double angles

2L8x4x1/2LLBB

Weight
39.2 lb/ft (0.0%)
Depth
8.00 in (0.0%)
Ix
77.2 in⁴ (0.0%)
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Source: AISC Shapes Database v16.0 · Methodology