StructureCalcsHSS16X16X7/8
Square HSS · AISC Shapes Database v15.0 · United States
HSS16X16X7/8 is a square hollow structural section 406 × 406 mm with a 22.2 mm wall, weighing 258.1 kg/m. The dimensions below are the published AISC Shapes Database v15.0 values; the drawing is generated from them.
Square HSS give equal stiffness both ways with flat faces for simple welded connections — a standard column and brace choice in US practice.
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Published dimensions
| Property | Metric | Imperial |
|---|---|---|
| Overall depth, d | 406 mm | 16.00 in |
| Overall width, b | 406 mm | 16.00 in |
| Wall thickness, t | 22.2 mm | 0.875 in |
| Mass per metre | 258.1 kg/m | 173.4 lb/ft |
| Area, A | 30,774 mm² | 47.70 in² |
| Second moment, Ix | 749,216,567 mm⁴ | 1,800.0 in⁴ |
| Second moment, Iy | 749,216,567 mm⁴ | 1,800.0 in⁴ |
Derived section properties
Integrated from the section's own outline including its outside corner radii, whose arcs are integrated analytically rather than approximated by facets. For HSS16X16X7/8 the computed area agrees with the published value to 0.03% and Ix to 0.01%. Where a value is also published, the published one above is the one to quote.
AISC tabulates hollow-section properties on the design wall (tdes = 0.93 tnom, per AISC 360), while the published mass reflects the nominal wall — which is why mass and area here differ by about 7% by convention, on every AISC hollow section.
| Property | Value |
|---|---|
| Elastic modulus, Sx | 3,687,554 mm³ |
| Elastic modulus, Sy | 3,687,554 mm³ |
| Plastic modulus, Zx | 4,397,309 mm³ |
| Plastic modulus, Zy | 4,397,309 mm³ |
| Radius of gyration, rx | 156.0 mm |
| Radius of gyration, ry | 156.0 mm |
S is the elastic modulus and Z the plastic modulus, following AISC 360. Australian and British practice reverse the letters.
Neighbouring sizes
Where these numbers come from
Published AISC Shapes Database v15.0 values. How StructureCalcs verifies its numbers · Understanding steel section properties · Query this section over the API