W 44X290 vs UB 1016×305×487
W 44X290 is an W section from the American AISC Shapes Database; UB 1016×305×487 is the closest equivalent in the UK Blue Book (SCI P363). They are close to interchangeable in bending: 23105.8 cm³ against 23200 cm³ of plastic modulus, a difference of 0.4%. W 44X290 is the lighter of the two at 431.6 kg/m against 486.7 kg/m, a saving of 11.3% on steel weight. W 44X290 is deeper, 1107.4 mm against 1036.3 mm, which matters where the floor zone is tight.
| Property | W 44X290 W | UB 1016×305×487 UB | Difference |
|---|---|---|---|
| Mass | 431.6 kg/m | 486.7 kg/m | -11.3% |
| Depth | 1107.4 mm | 1036.3 mm | +6.9% |
| Width | 401.3 mm | 308.5 mm | +30.1% |
| Web thickness | 22 mm | 30 mm | -26.7% |
| Flange thickness | 40.1 mm | 54.1 mm | -25.9% |
| Area | 551 cm² | 620 cm² | -11.1% |
| Second moment, major (Iy) | 1,123,825 cm⁴ | 1,022,000 cm⁴ | +10.0% |
| Plastic modulus, major (Wpl,y) | 23,105.8 cm³ | 23,200 cm³ | -0.4% |
| Elastic modulus, major (Wel,y) | 20,320 cm³ | 19,700 cm³ | +3.1% |
| Second moment, minor (Iz) | 43,288 cm⁴ | 26,700 cm⁴ | +62.1% |
| Plastic modulus, minor (Wpl,z) | 3,359.3 cm³ | 2,800 cm³ | +20.0% |
| Radius of gyration, minor (iz) | 8.86 cm | 6.57 cm | +34.9% |
| Torsion constant (It) | 2,119 cm⁴ | 4,300 cm⁴ | -50.7% |
W 44X290 to AISC Shapes Database v16.0; UB 1016×305×487 to BS EN 10365:2017. Difference is expressed relative to UB 1016×305×487.
How to choose between them
On stiffness, W 44X290 has the larger second moment of area: 1,123,825 cm⁴ against 1,022,000 cm⁴, a difference of 10.0%. This matters more often than the strength comparison, because on normal floor spans deflection rather than bending capacity sets the beam size - so if the two are close on modulus but apart on inertia, the stiffer one is usually the better answer even when it is not the stronger one.
Measured as bending capacity per kilogram of steel, W 44X290 is the more efficient section: 53.5 against 47.7 cm³ per kg/m, 12.3% better. Over a floor of repeated beams that difference is real tonnage, though it is often outweighed by whichever section the fabricator can actually source.
The two diverge much more about the minor axis: W 44X290 has 3359.3 cm³ of minor-axis plastic modulus against 2800 cm³, 20.0% more. If the member sees any minor-axis bending, or if it is unrestrained over a long length and lateral-torsional buckling governs, that gap decides the comparison even though the major-axis numbers looked equivalent.
These come from different catalogues, so treat the swap as a design change rather than a like-for-like substitution. W sections are specified to AISC Shapes Database v16.0 and UB to BS EN 10365:2017; the steel grades, tolerances and available lengths differ, connection details and bolt gauges are set out differently, and the two are rarely both stocked in the same market. Check availability before changing a section on a drawing to save 11.3% weight.
In short, UB 1016×305×487 is the stronger section and W 44X290 is the lighter one; where those are the same section, it is the clear choice, and where they are not, decide on whether your design is governed by capacity or by tonnage.