HSS18×6×5/16 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.

HSS18×6×5/16 is a rectangular tube 18 in. by 6 in. with a 5/16 in. nominal wall.

At 48.86 lb per foot it is one of the 6 HSS18×6 sizes, which run from 39.43 to 109.91 lb/ft.

For strong-axis bending its section modulus is Sx = 57 in³ and its moment of inertia Ix = 513 in⁴, with a plastic modulus Zx = 73.1 in³.

Detailing dimensions

Depth (Ht)18"
Width (B)6"
Nominal wall (t)5/16"

Section properties

Weight48.86 lb/ft
Area (A)13.4 in²
Ix513 in⁴
Sx57 in³
Zx73.1 in³
rx6.18 in
Iy91.3 in⁴
Sy30.4 in³
Zy33.5 in³
ry2.61 in
J257 in⁴

Other HSS18×6 sizes

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

HSS18×6×1/4HSS18×6×3/8HSS18×6×1/2HSS18×6×5/8HSS18×6×3/4

All HSS18×6 sizes and dimensions →

Similar weight HSS shapes

Comparable 48.86 lb/ft sections in other HSS tube sizes.

HSS20×4×5/1648.86 lb/ft · Sx 56 in³HSS16×8×5/1648.86 lb/ft · Sx 56.4 in³HSS14×10×5/1648.86 lb/ft · Sx 54.3 in³HSS12×12×5/1648.86 lb/ft · Sx 50.7 in³HSS12×4×1/248.85 lb/ft · Sx 34.9 in³HSS10×6×1/248.85 lb/ft · Sx 34.3 in³HSS9×7×1/248.85 lb/ft · Sx 33 in³HSS8×8×1/248.85 lb/ft · Sx 31.2 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 HSS18×6×5/16 cut, formed, or fabricated? Huntington Steel & Supply Co.

Browse more: HSS tube · Steel Beam Size Chart

Interactive drawing