StructureCalcs914x419x388 UB
Universal Beam · BS 4-1 · United Kingdom
914x419x388 UB is a British universal beam 921.0 mm deep with a 420.5 mm wide flange, weighing 388.0 kg/m. The dimensions below are the published BS 4-1 values; the drawing is generated from them.
British Universal Beams to BS 4-1 are the UK’s standard I-beam — the same designation style as the Australian UB, but a distinct dimension table.
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Published dimensions
| Property | Metric | Imperial |
|---|---|---|
| Depth, d | 921.0 mm | 36.26 in |
| Flange width, bf | 420.5 mm | 16.56 in |
| Flange thickness, tf | 36.6 mm | 1.441 in |
| Web thickness, tw | 21.4 mm | 0.843 in |
| Mass per metre | 388.0 kg/m | 260.7 lb/ft |
| Area, A | 49,400 mm² | 76.57 in² |
| Second moment, Ix | 7,196,350,000 mm⁴ | 17,289.3 in⁴ |
| Second moment, Iy | 454,380,000 mm⁴ | 1,091.7 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 914x419x388 UB the computed area agrees with the published value to better than 0.01% and Ix to 0.05%. Where a value is also published, the published one above is the one to quote.
| Property | Value |
|---|---|
| Elastic modulus, Zx | 15,619,553 mm³ |
| Elastic modulus, Zy | 2,161,125 mm³ |
| Plastic modulus, Sx | 17,656,719 mm³ |
| Plastic modulus, Sy | 3,340,511 mm³ |
| Radius of gyration, rx | 381.6 mm |
| Radius of gyration, ry | 95.9 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