Steel Beam Sizes / AISC / HSS Round / HSS 18.000x0.313

HSS 18.000x0.313 Steel Beam Dimensions and Properties

AISC Round HSS · v16.0

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

Units

Section diagram

HSS 18.000x0.313 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 59.09 lb/ft 87.90 kg/m
OD 18.000 in 457.000 mm
Nominal tw 0.313 in 7.950 mm
Design tw 0.291 in 7.390 mm
Area 16.20 in² 10,500.00 mm²
Ix 634.00 in⁴ 264,000,000 mm⁴
Iy 634.00 in⁴ 264,000,000 mm⁴
Sx 70.40 in³ 1,150,000 mm³
Sy 70.40 in³ 1,150,000 mm³
Zx 91.20 in³ 1,490,000 mm³
Zy 91.20 in³ 1,490,000 mm³
rx 6.26 in 159.00 mm
ry 6.26 in 159.00 mm
J 1,270.00 in⁴ 529,000,000 mm⁴

Alternatives

Useful nearby sections

Same-series weight neighbors, closest Ix, and a nearby depth series when available — with percent change versus HSS 18.000x0.313.

Lighter in Round HSS

HSS 10.750x0.500

Weight
54.8 lb/ft (-7.3%)
Depth
— in
Ix
199.0 in⁴ (-69%)

Heavier in Round HSS

HSS 11.750x0.500

Weight
60.1 lb/ft (+1.8%)
Depth
— in
Ix
263.0 in⁴ (-59%)

Closest Iₓ in Round HSS

HSS 14.000x0.750

Weight
106.2 lb/ft (+80%)
Depth
— in
Ix
647.0 in⁴ (+2.1%)
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Source: AISC Shapes Database v16.0 · Methodology