HSS18×18×1/2 square/rectangular HSS tube

Detailing dimensions and section properties from the AISC Shapes Database, 16th Edition. Values are shown to the nearest 1/16 in. as they appear on a shop drawing.

HSS18×18×1/2 is a square tube 18 in. by 18 in. with a 1/2 in. nominal wall.

At 116.91 lb per foot it is one of the 8 HSS18×18 sizes, which run from 59.85 to 222.63 lb/ft.

For strong-axis bending its section modulus is Sx = 181 in³ and its moment of inertia Ix = 1630 in⁴, with a plastic modulus Zx = 210 in³.

Detailing dimensions

Depth (Ht)18"
Width (B)18"
Nominal wall (t)1/2"

Section properties

Weight116.91 lb/ft
Area (A)32.1 in²
Ix1630 in⁴
Sx181 in³
Zx210 in³
rx7.13 in
Iy1630 in⁴
Sy181 in³
Zy210 in³
ry7.13 in
J2540 in⁴

Other HSS18×18 sizes

Same nominal size, different weight — useful when you are checking a substitution or a lighter section.

HSS18×18×1/4HSS18×18×5/16HSS18×18×3/8HSS18×18×5/8HSS18×18×3/4HSS18×18×7/8HSS18×18×1

All HSS18×18 sizes and dimensions →

Similar weight HSS shapes

Comparable 116.91 lb/ft sections in other HSS tube sizes.

HSS24×12×1/2116.91 lb/ft · Sx 202 in³HSS22×14×1/2116.91 lb/ft · Sx 197 in³HSS20×16×1/2116.91 lb/ft · Sx 190 in³HSS18.000×0.625116.09 lb/ft · Sx 134 in³HSS22.000×0.500114.92 lb/ft · Sx 166 in³HSS16.000×0.750122.27 lb/ft · Sx 123 in³HSS14.000×0.875122.77 lb/ft · Sx 105 in³HSS28.000×0.375110.74 lb/ft · Sx 207 in³

Detailing values are rounded to the nearest 1/16 in. per the AISC Steel Construction Manual. Verify critical dimensions against the current Manual before fabrication. Need HSS18×18×1/2 cut, formed, or fabricated? Huntington Steel & Supply Co.

Browse more: HSS tube · Steel Beam Size Chart

Interactive drawing