StructureCalcsHSS2-1/2X2-1/2X1/4
Square HSS · AISC Shapes Database v15.0 · United States
HSS2-1/2X2-1/2X1/4 is a square hollow structural section 64 × 64 mm with a 6.4 mm wall, weighing 10.6 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.
Analyse this section, or combine it with plates and other shapes.
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Published dimensions
| Property | Metric | Imperial |
|---|---|---|
| Overall depth, d | 64 mm | 2.50 in |
| Overall width, b | 64 mm | 2.50 in |
| Wall thickness, t | 6.4 mm | 0.250 in |
| Mass per metre | 10.6 kg/m | 7.1 lb/ft |
| Area, A | 1,271 mm² | 1.97 in² |
| Second moment, Ix | 678,457 mm⁴ | 1.6 in⁴ |
| Second moment, Iy | 678,457 mm⁴ | 1.6 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 HSS2-1/2X2-1/2X1/4 the computed area agrees with the published value to 0.02% and Ix to 0.36%. 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 | 21,292 mm³ |
| Elastic modulus, Sy | 21,292 mm³ |
| Plastic modulus, Zx | 26,735 mm³ |
| Plastic modulus, Zy | 26,735 mm³ |
| Radius of gyration, rx | 23.1 mm |
| Radius of gyration, ry | 23.1 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