W 14X99 vs HP 14X102
W 14X99 is an W section from the American AISC Shapes Database; HP 14X102 is the closest equivalent in the American AISC Shapes Database. W 14X99 carries more bending: 2835 cm³ of plastic modulus against 2769.4 cm³, 2.4% more. W 14X99 is the lighter of the two at 147.3 kg/m against 151.8 kg/m, a saving of 3.0% on steel weight. Both are about 358 mm deep, so either fits the same construction zone.
| Property | W 14X99 W | HP 14X102 HP | Difference |
|---|---|---|---|
| Mass | 147.3 kg/m | 151.8 kg/m | -3.0% |
| Depth | 360.7 mm | 355.6 mm | +1.4% |
| Width | 370.8 mm | 375.9 mm | -1.4% |
| Web thickness | 12.3 mm | 17.9 mm | -31.3% |
| Flange thickness | 19.8 mm | 17.9 mm | +10.6% |
| Area | 187.7 cm² | 194.2 cm² | -3.3% |
| Second moment, major (Iy) | 46,202 cm⁴ | 43,704 cm⁴ | +5.7% |
| Plastic modulus, major (Wpl,y) | 2,835 cm³ | 2,769.4 cm³ | +2.4% |
| Elastic modulus, major (Wel,y) | 2,572.8 cm³ | 2,458.1 cm³ | +4.7% |
| Second moment, minor (Iz) | 16,733 cm⁴ | 15,817 cm⁴ | +5.8% |
| Plastic modulus, minor (Wpl,z) | 1,370 cm³ | 1,291.3 cm³ | +6.1% |
| Radius of gyration, minor (iz) | 9.42 cm | 9.04 cm | +4.2% |
| Torsion constant (It) | 223.5 cm⁴ | 224.3 cm⁴ | -0.4% |
W 14X99 to AISC Shapes Database v16.0; HP 14X102 to AISC Shapes Database v16.0. Difference is expressed relative to HP 14X102.
How to choose between them
On stiffness, W 14X99 has the larger second moment of area: 46,202 cm⁴ against 43,704 cm⁴, a difference of 5.7%. 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 14X99 is the more efficient section: 19.2 against 18.2 cm³ per kg/m, 5.5% 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.
In short, W 14X99 is the stronger section and W 14X99 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.