HSS20×20×3/4 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.

HSS20×20×3/4 is a square tube 20 in. by 20 in. with a 3/4 in. nominal wall.

At 191.58 lb per foot it is one of the 7 HSS20×20 sizes, which run from 82.88 to 249.85 lb/ft.

For strong-axis bending its section modulus is Sx = 323 in³ and its moment of inertia Ix = 3230 in⁴, with a plastic modulus Zx = 378 in³.

Detailing dimensions

Depth (Ht)20"
Width (B)20"
Nominal wall (t)3/4"

Section properties

Weight191.58 lb/ft
Area (A)52.6 in²
Ix3230 in⁴
Sx323 in³
Zx378 in³
rx7.84 in
Iy3230 in⁴
Sy323 in³
Zy378 in³
ry7.84 in
J5110 in⁴

Other HSS20×20 sizes

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

HSS20×20×5/16HSS20×20×3/8HSS20×20×1/2HSS20×20×5/8HSS20×20×7/8HSS20×20×1

All HSS20×20 sizes and dimensions →

Similar weight HSS shapes

Comparable 191.58 lb/ft sections in other HSS tube sizes.

HSS30×10×3/4191.58 lb/ft · Sx 363 in³HSS24×16×3/4191.58 lb/ft · Sx 350 in³HSS22×18×3/4191.58 lb/ft · Sx 338 in³HSS20×12×1195.4 lb/ft · Sx 274 in³HSS16×16×1195.4 lb/ft · Sx 249 in³HSS24.000×0.750186.41 lb/ft · Sx 289 in³HSS24×12×7/8197.24 lb/ft · Sx 326 in³HSS18×18×7/8197.24 lb/ft · Sx 292 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 HSS20×20×3/4 cut, formed, or fabricated? Huntington Steel & Supply Co.

Browse more: HSS tube · Steel Beam Size Chart

Interactive drawing