HSS18×18×1 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.
HSS18×18×1 is a square tube 18 in. by 18 in. with a 1 in. nominal wall.
At 222.63 lb per foot it is the heaviest of the 8 HSS18×18 sizes, which run from 59.85 to 222.63 lb/ft.
For strong-axis bending its section modulus is Sx = 324 in³ and its moment of inertia Ix = 2920 in⁴, with a plastic modulus Zx = 387 in³.
Detailing dimensions
| Depth (Ht) | 18" |
|---|---|
| Width (B) | 18" |
| Nominal wall (t) | 1" |
Section properties
| Weight | 222.63 lb/ft |
|---|---|
| Area (A) | 61.3 in² |
| Ix | 2920 in⁴ |
| Sx | 324 in³ |
| Zx | 387 in³ |
| rx | 6.9 in |
| Iy | 2920 in⁴ |
| Sy | 324 in³ |
| Zy | 387 in³ |
| ry | 6.9 in |
| J | 4740 in⁴ |
Other HSS18×18 sizes
Same nominal size, different weight — useful when you are checking a substitution or a lighter section.
All HSS18×18 sizes and dimensions →
Similar weight HSS shapes
Comparable 222.63 lb/ft sections in other HSS tube sizes.
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 HSS18×18×1 cut, formed, or fabricated? Huntington Steel & Supply Co.
Browse more: HSS tube · Steel Beam Size Chart