Steel Beam Sizes / AISC / Pipe / Pipe18STD

Pipe18STD 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

Pipe18STD 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 70.70 lb/ft 105.00 kg/m
OD 18.000 in 457.000 mm
Nominal tw 0.375 in 9.530 mm
Design tw 0.349 in 8.860 mm
Area 19.40 in² 12,500.00 mm²
Ix 756.00 in⁴ 315,000,000 mm⁴
Iy 756.00 in⁴ 315,000,000 mm⁴
Sx 84.00 in³ 1,380,000 mm³
Sy 84.00 in³ 1,380,000 mm³
Zx 109.00 in³ 1,790,000 mm³
Zy 109.00 in³ 1,790,000 mm³
rx 6.24 in 158.00 mm
ry 6.24 in 158.00 mm
J 1,510.00 in⁴ 628,000,000 mm⁴

Alternatives

Useful nearby sections

Same-series weight neighbors, closest Ix, and a nearby depth series when available — with percent change versus Pipe18STD.

Lighter in Pipe sections

Pipe12xS

Weight
65.5 lb/ft (-7.4%)
Depth
— in
Ix
339.0 in⁴ (-55%)

Heavier in Pipe sections

Pipe14xS

Weight
72.2 lb/ft (+2.1%)
Depth
— in
Ix
440.0 in⁴ (-42%)

Closest Iₓ in Pipe sections

Pipe16xS

Weight
82.9 lb/ft (+17%)
Depth
— in
Ix
665.0 in⁴ (-12%)
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Source: AISC Shapes Database v16.0 · Methodology