W14×311 vs W14×342
A side-by-side comparison of two AISC wide-flange beams, 16th Edition. Detailing dimensions to the nearest 1/16 in.
W14×342 is the heavier section at 342 lb per foot, versus 311 for W14×311 (31 lb/ft more).
Both are nominally 14 in. deep.
W14×342 has the greater bending strength: section modulus Sx of 558 in³ versus 506, about 10% more.
| Property | W14×311 | W14×342 |
|---|---|---|
| Weight | 311 lb/ft | 342 lb/ft |
| Depth (d) | 17 1/8" | 17 1/2" |
| Flange width (bf) | 16 1/4" | 16 3/8" |
| Web thickness (tw) | 1 7/16" | 1 9/16" |
| Flange thickness (tf) | 2 1/4" | 2 1/2" |
| Area (A) | 91.4 in² | 101 in² |
| Moment of inertia (Ix) | 4330 in⁴ | 4900 in⁴ |
| Section modulus (Sx) | 506 in³ | 558 in³ |
| Plastic modulus (Zx) | 603 in³ | 672 in³ |
Open W14×311 in the interactive size chart →
Full detail: W14×311 · W14×342. Verify critical dimensions against the current AISC Steel Construction Manual before fabrication.
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