Steel Beam Sizes / AISC / HSS Square / HSS 3x3x5/16

HSS 3x3x5/16 Steel Beam Dimensions and Properties

AISC Square HSS · v16.0

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

Units

Section diagram

HSS 3x3x5/16 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 10.58 lb/ft 15.70 kg/m
Height 3.00 in 76.20 mm
Width 3.00 in 76.20 mm
Nominal tw 0.313 in 7.940 mm
Design tw 0.291 in 7.390 mm
Area 2.94 in² 1,900.00 mm²
Ix 3.45 in⁴ 1,440,000 mm⁴
Iy 3.45 in⁴ 1,440,000 mm⁴
Sx 2.30 in³ 37,700.00 mm³
Sy 2.30 in³ 37,700.00 mm³
Zx 2.90 in³ 47,500.00 mm³
Zy 2.90 in³ 47,500.00 mm³
rx 1.08 in 27.40 mm
ry 1.08 in 27.40 mm
J 5.94 in⁴ 2,470,000 mm⁴

Alternatives

Useful nearby sections

Same-series weight neighbors, closest Ix, and a nearby depth series when available — with percent change versus HSS 3x3x5/16.

Lighter in Square HSS

HSS 3-1/2x3-1/2x1/4

Weight
10.5 lb/ft (-0.7%)
Depth
3.50 in (+17%)
Ix
5.0 in⁴ (+46%)

Heavier in Square HSS

HSS 4-1/2x4-1/2x3/16

Weight
10.7 lb/ft (+1.1%)
Depth
4.50 in (+50%)
Ix
9.0 in⁴ (+161%)

Closest Iₓ in Square HSS

HSS 3x3x3/8

Weight
12.2 lb/ft (+15%)
Depth
3.00 in (0.0%)
Ix
3.8 in⁴ (+9.6%)
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Source: AISC Shapes Database v16.0 · Methodology