W30×235 vs W40×235
A side-by-side comparison of two AISC wide-flange beams, 16th Edition. Detailing dimensions to the nearest 1/16 in.
W30×235 and W40×235 both weigh 235 lb per foot, so the choice comes down to depth and stiffness rather than weight.
W40×235 is the deeper section at a nominal 40 in., versus 30 in.
W40×235 has the greater bending strength: section modulus Sx of 875 in³ versus 748, about 17% more.
| Property | W30×235 | W40×235 |
|---|---|---|
| Weight | 235 lb/ft | 235 lb/ft |
| Depth (d) | 31 1/4" | 39 3/4" |
| Flange width (bf) | 15" | 11 7/8" |
| Web thickness (tw) | 13/16" | 13/16" |
| Flange thickness (tf) | 1 1/2" | 1 9/16" |
| Area (A) | 69.3 in² | 69.1 in² |
| Moment of inertia (Ix) | 11700 in⁴ | 17400 in⁴ |
| Section modulus (Sx) | 748 in³ | 875 in³ |
| Plastic modulus (Zx) | 847 in³ | 1010 in³ |
Open W30×235 in the interactive size chart →
Full detail: W30×235 · W40×235. Verify critical dimensions against the current AISC Steel Construction Manual before fabrication.
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