StructureCalcs305x305x158 UC
Universal Column · BS 4-1 · United Kingdom
305x305x158 UC is a British universal column 327.1 mm deep with a 311.2 mm wide flange, weighing 158.1 kg/m. The dimensions below are the published BS 4-1 values; the drawing is generated from them.
British Universal Columns are the BS 4-1 column family — near-square rolled H-sections for axial load.
Analyse this section, or combine it with plates and other shapes.
Open 305x305x158 UC in the Section CalculatorFree, no sign-up, runs in your browser.
Published dimensions
| Property | Metric | Imperial |
|---|---|---|
| Depth, d | 327.1 mm | 12.88 in |
| Flange width, bf | 311.2 mm | 12.25 in |
| Flange thickness, tf | 25.0 mm | 0.984 in |
| Web thickness, tw | 15.8 mm | 0.622 in |
| Mass per metre | 158.1 kg/m | 106.2 lb/ft |
| Area, A | 20,100 mm² | 31.16 in² |
| Second moment, Ix | 387,470,000 mm⁴ | 930.9 in⁴ |
| Second moment, Iy | 125,690,000 mm⁴ | 302.0 in⁴ |
Derived section properties
Integrated from the section's own outline including the root and toe radii, whose arcs are integrated analytically rather than approximated by facets. For 305x305x158 UC the computed area agrees with the published value to better than 0.01% and Ix to 0.17%. Where a value is also published, the published one above is the one to quote.
| Property | Value |
|---|---|
| Elastic modulus, Zx | 2,365,040 mm³ |
| Elastic modulus, Zy | 807,762 mm³ |
| Plastic modulus, Sx | 2,675,466 mm³ |
| Plastic modulus, Sy | 1,229,628 mm³ |
| Radius of gyration, rx | 138.7 mm |
| Radius of gyration, ry | 79.1 mm |
Z is the elastic modulus and S the plastic modulus, following British practice (BS 5950 notation). Under AISC 360 the letters are reversed.
Neighbouring sizes
Where these numbers come from
Published BS 4-1 values. How StructureCalcs verifies its numbers · Understanding steel section properties · Query this section over the API