UB 1016×305×393 vs HE 1000 x 393
UB 1016×305×393 is an UB section from the UK Blue Book (SCI P363); HE 1000 x 393 is the closest equivalent in the European (Continental) range. They are close to interchangeable in bending: 18500 cm³ against 18500 cm³ of plastic modulus, a difference of 0.0%. They weigh essentially the same, 392.7 kg/m and 393 kg/m. Both are about 1016 mm deep, so either fits the same construction zone.
| Property | UB 1016×305×393 UB | HE 1000 x 393 HE | Difference |
|---|---|---|---|
| Mass | 392.7 kg/m | 393 kg/m | -0.1% |
| Depth | 1015.9 mm | 1016 mm | same |
| Width | 303 mm | 303 mm | same |
| Web thickness | 24.4 mm | 24.4 mm | same |
| Flange thickness | 43.9 mm | 43.9 mm | same |
| Area | 500 cm² | 500 cm² | same |
| Second moment, major (Iy) | 808,000 cm⁴ | 808,000 cm⁴ | same |
| Plastic modulus, major (Wpl,y) | 18,500 cm³ | 18,500 cm³ | same |
| Elastic modulus, major (Wel,y) | 15,900 cm³ | 15,900 cm³ | same |
| Second moment, minor (Iz) | 20,500 cm⁴ | 20,500 cm⁴ | same |
| Plastic modulus, minor (Wpl,z) | 2,170 cm³ | 2,170 cm³ | same |
| Radius of gyration, minor (iz) | 6.4 cm | 6.4 cm | same |
| Torsion constant (It) | 2,330 cm⁴ | 2,330 cm⁴ | same |
UB 1016×305×393 to BS EN 10365:2017; HE 1000 x 393 to EN 10365 · Continental Steel. Difference is expressed relative to HE 1000 x 393.
How to choose between them
On stiffness, HE 1000 x 393 has the larger second moment of area: 808,000 cm⁴ against 808,000 cm⁴, a difference of 0.0%. 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, the two are equally efficient (47.1 against 47.1 cm³ per kg/m), so on a pure steel-tonnage basis there is nothing to choose between them. The decision comes down to availability, connection detailing and what the rest of the frame uses.
These come from different catalogues, so treat the swap as a design change rather than a like-for-like substitution. UB sections are specified to BS EN 10365:2017 and HE to EN 10365 · Continental Steel; 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 a marginal amount of weight.
In short, these two are genuine equivalents. Pick whichever your supplier stocks and the rest of the frame already uses.