HSS20×8×5/16 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.

HSS20×8×5/16 is a rectangular tube 20 in. by 8 in. with a 5/16 in. nominal wall.

At 57.36 lb per foot it is the lightest of the 7 HSS20×8 sizes, which run from 57.36 to 168.18 lb/ft.

For strong-axis bending its section modulus is Sx = 78.6 in³ and its moment of inertia Ix = 786 in⁴, with a plastic modulus Zx = 98.6 in³.

Detailing dimensions

Depth (Ht)20"
Width (B)8"
Nominal wall (t)5/16"

Section properties

Weight57.36 lb/ft
Area (A)15.7 in²
Ix786 in⁴
Sx78.6 in³
Zx98.6 in³
rx7.07 in
Iy189 in⁴
Sy47.4 in³
Zy52 in³
ry3.47 in
J496 in⁴

Other HSS20×8 sizes

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

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

All HSS20×8 sizes and dimensions →

Similar weight HSS shapes

Comparable 57.36 lb/ft sections in other HSS tube sizes.

HSS18×10×5/1657.36 lb/ft · Sx 77.2 in³HSS16×12×5/1657.36 lb/ft · Sx 74.4 in³HSS14×14×5/1657.36 lb/ft · Sx 69.9 in³HSS20×4×3/858.1 lb/ft · Sx 65.7 in³HSS18×6×3/858.1 lb/ft · Sx 66.9 in³HSS16×8×3/858.1 lb/ft · Sx 66.3 in³HSS14×10×3/858.1 lb/ft · Sx 63.9 in³HSS12×12×3/858.1 lb/ft · Sx 59.5 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 HSS20×8×5/16 cut, formed, or fabricated? Huntington Steel & Supply Co.

Browse more: HSS tube · Steel Beam Size Chart

Interactive drawing