Steel Beam Sizes / AISC / Pipe / Pipe3-1/2xS

Pipe3-1/2xS Steel Beam Dimensions and Properties

AISC Pipe sections · v16.0

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

Units

Section diagram

Pipe3-1/2xS 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 12.50 lb/ft 18.60 kg/m
OD 4.000 in 101.600 mm
Nominal tw 0.318 in 8.080 mm
Design tw 0.296 in 7.520 mm
Area 3.43 in² 2,210.00 mm²
Ix 5.94 in⁴ 2,470,000 mm⁴
Iy 5.94 in⁴ 2,470,000 mm⁴
Sx 2.97 in³ 48,700.00 mm³
Sy 2.97 in³ 48,700.00 mm³
Zx 4.07 in³ 66,700.00 mm³
Zy 4.07 in³ 66,700.00 mm³
rx 1.31 in 33.30 mm
ry 1.31 in 33.30 mm
J 11.90 in⁴ 4,950,000 mm⁴

Alternatives

Useful nearby sections

Same-series weight neighbors, closest Ix, and a nearby depth series when available — with percent change versus Pipe3-1/2xS.

Lighter in Pipe sections

Pipe4STD

Weight
10.8 lb/ft (-14%)
Depth
— in
Ix
6.8 in⁴ (+15%)

Heavier in Pipe sections

Pipe2-1/2xxS

Weight
13.7 lb/ft (+9.6%)
Depth
— in
Ix
2.8 in⁴ (-53%)

Closest Iₓ in Pipe sections

Pipe3xxS

Weight
18.6 lb/ft (+49%)
Depth
— in
Ix
5.8 in⁴ (-2.5%)
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Source: AISC Shapes Database v16.0 · Methodology