HSS18×6×3/8 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.

HSS18×6×3/8 is a rectangular tube 18 in. by 6 in. with a 3/8 in. nominal wall.

At 58.1 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 = 66.9 in³ and its moment of inertia Ix = 602 in⁴, with a plastic modulus Zx = 86.4 in³.

Detailing dimensions

Depth (Ht)18"
Width (B)6"
Nominal wall (t)3/8"

Section properties

Weight58.1 lb/ft
Area (A)16 in²
Ix602 in⁴
Sx66.9 in³
Zx86.4 in³
rx6.15 in
Iy106 in⁴
Sy35.5 in³
Zy39.5 in³
ry2.58 in
J302 in⁴

Other HSS18×6 sizes

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

HSS18×6×1/4HSS18×6×5/16HSS18×6×1/2HSS18×6×5/8HSS18×6×3/4

All HSS18×6 sizes and dimensions →

Similar weight HSS shapes

Comparable 58.1 lb/ft sections in other HSS tube sizes.

HSS20×4×3/858.1 lb/ft · Sx 65.7 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 in³HSS20×8×5/1657.36 lb/ft · Sx 78.6 in³HSS18×10×5/1657.36 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 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 HSS18×6×3/8 cut, formed, or fabricated? Huntington Steel & Supply Co.

Browse more: HSS tube · Steel Beam Size Chart

Interactive drawing