StructureCalcsPipe1-1/4XS
Steel Pipe · AISC Shapes Database v15.0 · United States
Pipe1-1/4XS is a steel pipe section 42.2 mm in outside diameter with a 4.5 mm wall, weighing 4.5 kg/m. The dimensions below are the published AISC Shapes Database v15.0 values; the drawing is generated from them.
Pipe sections are round tubes to ASTM A53 dimensions, tabulated by AISC alongside the HSS range for columns, braces and handrails.
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Published dimensions
| Property | Metric | Imperial |
|---|---|---|
| Outside diameter, d | 42.2 mm | 1.66 in |
| Wall thickness, t | 4.5 mm | 0.178 in |
| Mass per metre | 4.5 kg/m | 3.0 lb/ft |
| Area, A | 540 mm² | 0.84 in² |
| Second moment, Ix | 96,150 mm⁴ | 0.2 in⁴ |
| Second moment, Iy | 96,150 mm⁴ | 0.2 in⁴ |
Derived section properties
Integrated analytically from the exact circular tube. For Pipe1-1/4XS the computed area agrees with the published value to 1.02% and Ix to 0.13%. 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 | 4,555 mm³ |
| Elastic modulus, Sy | 4,555 mm³ |
| Plastic modulus, Zx | 6,435 mm³ |
| Plastic modulus, Zy | 6,435 mm³ |
| Radius of gyration, rx | 13.4 mm |
| Radius of gyration, ry | 13.4 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