HSS18×6×3/4 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.

HSS18×6×3/4 is a rectangular tube 18 in. by 6 in. with a 3/4 in. nominal wall.

At 109.91 lb per foot it is the heaviest 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 = 118 in³ and its moment of inertia Ix = 1060 in⁴, with a plastic modulus Zx = 158 in³.

Detailing dimensions

Depth (Ht)18"
Width (B)6"
Nominal wall (t)3/4"

Section properties

Weight109.91 lb/ft
Area (A)30.3 in²
Ix1060 in⁴
Sx118 in³
Zx158 in³
rx5.92 in
Iy179 in⁴
Sy59.6 in³
Zy70.4 in³
ry2.43 in
J530 in⁴

Other HSS18×6 sizes

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

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

All HSS18×6 sizes and dimensions →

Similar weight HSS shapes

Comparable 109.91 lb/ft sections in other HSS tube sizes.

HSS16×8×3/4109.91 lb/ft · Sx 117 in³HSS14×10×3/4109.91 lb/ft · Sx 113 in³HSS12×12×3/4109.91 lb/ft · Sx 105 in³HSS20×8×5/8110.36 lb/ft · Sx 144 in³HSS18×10×5/8110.36 lb/ft · Sx 142 in³HSS16×12×5/8110.36 lb/ft · Sx 136 in³HSS14×14×5/8110.36 lb/ft · Sx 128 in³HSS24×20×3/8109.15 lb/ft · Sx 220 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 HSS18×6×3/4 cut, formed, or fabricated? Huntington Steel & Supply Co.

Browse more: HSS tube · Steel Beam Size Chart

Interactive drawing