Steel Beam Sizes / AISC / Pipe / Pipe18xS

Pipe18xS 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

Pipe18xS 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 93.50 lb/ft 139.00 kg/m
OD 18.000 in 457.000 mm
Nominal tw 0.500 in 12.700 mm
Design tw 0.465 in 11.800 mm
Area 24.80 in² 16,000.00 mm²
Ix 956.00 in⁴ 398,000,000 mm⁴
Iy 956.00 in⁴ 398,000,000 mm⁴
Sx 106.00 in³ 1,740,000 mm³
Sy 106.00 in³ 1,740,000 mm³
Zx 139.00 in³ 2,280,000 mm³
Zy 139.00 in³ 2,280,000 mm³
rx 6.21 in 158.00 mm
ry 6.21 in 158.00 mm
J 1,910.00 in⁴ 795,000,000 mm⁴

Alternatives

Useful nearby sections

Same-series weight neighbors, closest Ix, and a nearby depth series when available — with percent change versus Pipe18xS.

Lighter in Pipe sections

Pipe16xS

Weight
82.9 lb/ft (-11%)
Depth
— in
Ix
665.0 in⁴ (-30%)

Heavier in Pipe sections

Pipe24STD

Weight
94.7 lb/ft (+1.3%)
Depth
— in
Ix
1,820.0 in⁴ (+90%)

Closest Iₓ in Pipe sections

Pipe20STD

Weight
78.7 lb/ft (-16%)
Depth
— in
Ix
1,040.0 in⁴ (+8.8%)
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Source: AISC Shapes Database v16.0 · Methodology