HSS20×20×5/16 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.

HSS20×20×5/16 is a square tube 20 in. by 20 in. with a 5/16 in. nominal wall.

At 82.88 lb per foot it is the lightest 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 = 146 in³ and its moment of inertia Ix = 1460 in⁴, with a plastic modulus Zx = 167 in³.

Detailing dimensions

Depth (Ht)20"
Width (B)20"
Nominal wall (t)5/16"

Section properties

Weight82.88 lb/ft
Area (A)22.7 in²
Ix1460 in⁴
Sx146 in³
Zx167 in³
rx8.03 in
Iy1460 in⁴
Sy146 in³
Zy167 in³
ry8.03 in
J2250 in⁴

Other HSS20×20 sizes

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

HSS20×20×3/8HSS20×20×1/2HSS20×20×5/8HSS20×20×3/4HSS20×20×7/8HSS20×20×1

All HSS20×20 sizes and dimensions →

Similar weight HSS shapes

Comparable 82.88 lb/ft sections in other HSS tube sizes.

HSS24×16×5/1682.88 lb/ft · Sx 158 in³HSS22×18×5/1682.88 lb/ft · Sx 153 in³HSS20×6×1/282.88 lb/ft · Sx 102 in³HSS18×8×1/282.88 lb/ft · Sx 101 in³HSS16×10×1/282.88 lb/ft · Sx 99 in³HSS14×12×1/282.88 lb/ft · Sx 94 in³HSS16.000×0.50082.85 lb/ft · Sx 85.7 in³HSS12.750×0.62581.01 lb/ft · Sx 64.7 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 HSS20×20×5/16 cut, formed, or fabricated? Huntington Steel & Supply Co.

Browse more: HSS tube · Steel Beam Size Chart

Interactive drawing