HSS18×8×1/2 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.

HSS18×8×1/2 is a rectangular tube 18 in. by 8 in. with a 1/2 in. nominal wall.

At 82.88 lb per foot it is one 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 = 101 in³ and its moment of inertia Ix = 913 in⁴, with a plastic modulus Zx = 128 in³.

Detailing dimensions

Depth (Ht)18"
Width (B)8"
Nominal wall (t)1/2"

Section properties

Weight82.88 lb/ft
Area (A)22.8 in²
Ix913 in⁴
Sx101 in³
Zx128 in³
rx6.33 in
Iy257 in⁴
Sy64.2 in³
Zy72.5 in³
ry3.36 in
J659 in⁴

Other HSS18×8 sizes

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

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

All HSS18×8 sizes and dimensions →

Similar weight HSS shapes

Comparable 82.88 lb/ft sections in other HSS tube sizes.

HSS24×16×5/1682.88 lb/ft · Sx 158 in³HSS22×18×5/1682.88 lb/ft · Sx 153 in³HSS20×20×5/1682.88 lb/ft · Sx 146 in³HSS20×6×1/282.88 lb/ft · Sx 102 in³HSS16×10×1/282.88 lb/ft · Sx 99 in³HSS14×12×1/282.88 lb/ft · Sx 94 in³HSS16.000×0.50082.85 lb/ft · Sx 85.7 in³HSS12.750×0.62581.01 lb/ft · Sx 64.7 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 HSS18×8×1/2 cut, formed, or fabricated? Huntington Steel & Supply Co.

Browse more: HSS tube · Steel Beam Size Chart

Interactive drawing