W18×76 vs W24×76
A side-by-side comparison of two AISC wide-flange beams, 16th Edition. Detailing dimensions to the nearest 1/16 in.
W18×76 and W24×76 both weigh 76 lb per foot, so the choice comes down to depth and stiffness rather than weight.
W24×76 is the deeper section at a nominal 24 in., versus 18 in.
W24×76 has the greater bending strength: section modulus Sx of 176 in³ versus 146, about 21% more.
| Property | W18×76 | W24×76 |
|---|---|---|
| Weight | 76 lb/ft | 76 lb/ft |
| Depth (d) | 18 1/4" | 23 7/8" |
| Flange width (bf) | 11" | 9" |
| Web thickness (tw) | 7/16" | 7/16" |
| Flange thickness (tf) | 11/16" | 11/16" |
| Area (A) | 22.3 in² | 22.4 in² |
| Moment of inertia (Ix) | 1330 in⁴ | 2100 in⁴ |
| Section modulus (Sx) | 146 in³ | 176 in³ |
| Plastic modulus (Zx) | 163 in³ | 200 in³ |
Open W18×76 in the interactive size chart →
Full detail: W18×76 · W24×76. Verify critical dimensions against the current AISC Steel Construction Manual before fabrication.
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