HSS8×3×5/16 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.

HSS8×3×5/16 is a rectangular tube 8 in. by 3 in. with a 5/16 in. nominal wall.

At 21.21 lb per foot it is one of the 6 HSS8×3 sizes, which run from 9.01 to 31.84 lb/ft.

For strong-axis bending its section modulus is Sx = 10.6 in³ and its moment of inertia Ix = 42.4 in⁴, with a plastic modulus Zx = 13.9 in³.

Detailing dimensions

Depth (Ht)8"
Width (B)3"
Nominal wall (t)5/16"

Section properties

Weight21.21 lb/ft
Area (A)5.85 in²
Ix42.4 in⁴
Sx10.6 in³
Zx13.9 in³
rx2.69 in
Iy8.81 in⁴
Sy5.87 in³
Zy6.84 in³
ry1.23 in
J24.9 in⁴

Other HSS8×3 sizes

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

HSS8×3×1/8HSS8×3×3/16HSS8×3×1/4HSS8×3×3/8HSS8×3×1/2

All HSS8×3 sizes and dimensions →

Similar weight HSS shapes

Comparable 21.21 lb/ft sections in other HSS tube sizes.

HSS7×4×5/1621.21 lb/ft · Sx 10.4 in³HSS6×5×5/1621.21 lb/ft · Sx 9.85 in³HSS5-1/2×5-1/2×5/1621.21 lb/ft · Sx 9.43 in³HSS10.750×0.18821.17 lb/ft · Sx 15.1 in³HSS6.625×0.31221.06 lb/ft · Sx 8.79 in³HSS10×3-1/2×1/421.57 lb/ft · Sx 13.8 in³HSS5.563×0.37520.8 lb/ft · Sx 7.02 in³HSS5×3×1/221.63 lb/ft · Sx 6.57 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 HSS8×3×5/16 cut, formed, or fabricated? Huntington Steel & Supply Co.

Browse more: HSS tube · Steel Beam Size Chart

Interactive drawing