HSS18×18×1/4 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.

HSS18×18×1/4 is a square tube 18 in. by 18 in. with a 1/4 in. nominal wall.

At 59.85 lb per foot it is the lightest 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 = 95.6 in³ and its moment of inertia Ix = 860 in⁴, with a plastic modulus Zx = 109 in³.

Detailing dimensions

Depth (Ht)18"
Width (B)18"
Nominal wall (t)1/4"

Section properties

Weight59.85 lb/ft
Area (A)16.4 in²
Ix860 in⁴
Sx95.6 in³
Zx109 in³
rx7.24 in
Iy860 in⁴
Sy95.6 in³
Zy109 in³
ry7.24 in
J1320 in⁴

Other HSS18×18 sizes

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

HSS18×18×5/16HSS18×18×3/8HSS18×18×1/2HSS18×18×5/8HSS18×18×3/4HSS18×18×7/8HSS18×18×1

All HSS18×18 sizes and dimensions →

Similar weight HSS shapes

Comparable 59.85 lb/ft sections in other HSS tube sizes.

HSS24×12×1/459.85 lb/ft · Sx 106 in³HSS22×14×1/459.85 lb/ft · Sx 104 in³HSS20×16×1/459.85 lb/ft · Sx 100 in³HSS11.750×0.50060.13 lb/ft · Sx 44.7 in³HSS9.625×0.62560.13 lb/ft · Sx 35.2 in³HSS12×4×5/859.32 lb/ft · Sx 40.8 in³HSS10×6×5/859.32 lb/ft · Sx 40.2 in³HSS9×7×5/859.32 lb/ft · Sx 38.7 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 HSS18×18×1/4 cut, formed, or fabricated? Huntington Steel & Supply Co.

Browse more: HSS tube · Steel Beam Size Chart

Interactive drawing