W40×278 vs W40×294
A side-by-side comparison of two AISC wide-flange beams, 16th Edition. Detailing dimensions to the nearest 1/16 in.
W40×294 is the heavier section at 294 lb per foot, versus 278 for W40×278 (16 lb/ft more).
Both are nominally 40 in. deep.
W40×294 has the greater bending strength: section modulus Sx of 1080 in³ versus 1020, about 6% more.
| Property | W40×278 | W40×294 |
|---|---|---|
| Weight | 278 lb/ft | 294 lb/ft |
| Depth (d) | 40 1/8" | 40 3/8" |
| Flange width (bf) | 12" | 12" |
| Web thickness (tw) | 1" | 1 1/16" |
| Flange thickness (tf) | 1 13/16" | 1 15/16" |
| Area (A) | 82.3 in² | 86.2 in² |
| Moment of inertia (Ix) | 20500 in⁴ | 21900 in⁴ |
| Section modulus (Sx) | 1020 in³ | 1080 in³ |
| Plastic modulus (Zx) | 1190 in³ | 1270 in³ |
Open W40×278 in the interactive size chart →
Full detail: W40×278 · W40×294. Verify critical dimensions against the current AISC Steel Construction Manual before fabrication.
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