Steel Beam Sizes / AISC / HSS Square / HSS 18x18x5/16

HSS 18x18x5/16 Steel Beam Dimensions and Properties

AISC Square HSS · v16.0

Analyze in Beam Calculator Back to HSS Square

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

Units

Section diagram

HSS 18x18x5/16 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 74.38 lb/ft 111.00 kg/m
Height 18.00 in 457.00 mm
Width 18.00 in 457.00 mm
Nominal tw 0.313 in 7.950 mm
Design tw 0.291 in 7.390 mm
Area 20.40 in² 13,200.00 mm²
Ix 1,060.00 in⁴ 441,000,000 mm⁴
Iy 1,060.00 in⁴ 441,000,000 mm⁴
Sx 118.00 in³ 1,930,000 mm³
Sy 118.00 in³ 1,930,000 mm³
Zx 135.00 in³ 2,210,000 mm³
Zy 135.00 in³ 2,210,000 mm³
rx 7.21 in 183.00 mm
ry 7.21 in 183.00 mm
J 1,630.00 in⁴ 678,000,000 mm⁴

Alternatives

Useful nearby sections

Same-series weight neighbors, closest Ix, and a nearby depth series when available — with percent change versus HSS 18x18x5/16.

Lighter in Square HSS

HSS 14x14x3/8

Weight
68.3 lb/ft (-8.2%)
Depth
14.00 in (-22%)
Ix
577.0 in⁴ (-46%)

Heavier in Square HSS

HSS 12x12x1/2

Weight
76.1 lb/ft (+2.3%)
Depth
12.00 in (-33%)
Ix
457.0 in⁴ (-57%)

Closest Iₓ in Square HSS

HSS 14x14x3/4

Weight
130.3 lb/ft (+75%)
Depth
14.00 in (-22%)
Ix
1,040.0 in⁴ (-1.9%)
Analyze in Beam Calculator Compare in HSS Square finder

Source: AISC Shapes Database v16.0 · Methodology