HSS18×8×1/4 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.

HSS18×8×1/4 is a rectangular tube 18 in. by 8 in. with a 1/4 in. nominal wall.

At 42.84 lb per foot it is the lightest of the 5 HSS18×8 sizes, which run from 42.84 to 101.85000000000001 lb/ft.

For strong-axis bending its section modulus is Sx = 54.7 in³ and its moment of inertia Ix = 492 in⁴, with a plastic modulus Zx = 67.7 in³.

Detailing dimensions

Depth (Ht)18"
Width (B)8"
Nominal wall (t)1/4"

Section properties

Weight42.84 lb/ft
Area (A)11.8 in²
Ix492 in⁴
Sx54.7 in³
Zx67.7 in³
rx6.47 in
Iy141 in⁴
Sy35.2 in³
Zy38.6 in³
ry3.46 in
J351 in⁴

Other HSS18×8 sizes

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

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

All HSS18×8 sizes and dimensions →

Similar weight HSS shapes

Comparable 42.84 lb/ft sections in other HSS tube sizes.

HSS20×6×1/442.84 lb/ft · Sx 54.9 in³HSS16×10×1/442.84 lb/ft · Sx 53.3 in³HSS14×12×1/442.84 lb/ft · Sx 50.6 in³HSS14×4×3/842.79 lb/ft · Sx 36 in³HSS12×6×3/842.79 lb/ft · Sx 35.9 in³HSS10×8×3/842.79 lb/ft · Sx 33.9 in³HSS9×9×3/842.79 lb/ft · Sx 32.2 in³HSS8×4×5/842.3 lb/ft · Sx 20.5 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 HSS18×8×1/4 cut, formed, or fabricated? Huntington Steel & Supply Co.

Browse more: HSS tube · Steel Beam Size Chart

Interactive drawing