W40×392 vs W40×397
A side-by-side comparison of two AISC wide-flange beams, 16th Edition. Detailing dimensions to the nearest 1/16 in.
W40×397 is the heavier section at 397 lb per foot, versus 392 for W40×392 (5 lb/ft more).
Both are nominally 40 in. deep.
W40×397 has the greater bending strength: section modulus Sx of 1560 in³ versus 1440, about 8% more.
| Property | W40×392 | W40×397 |
|---|---|---|
| Weight | 392 lb/ft | 397 lb/ft |
| Depth (d) | 41 5/8" | 41" |
| Flange width (bf) | 12 3/8" | 16 1/8" |
| Web thickness (tw) | 1 7/16" | 1 1/4" |
| Flange thickness (tf) | 2 1/2" | 2 3/16" |
| Area (A) | 116 in² | 117 in² |
| Moment of inertia (Ix) | 29900 in⁴ | 32000 in⁴ |
| Section modulus (Sx) | 1440 in³ | 1560 in³ |
| Plastic modulus (Zx) | 1710 in³ | 1800 in³ |
Open W40×392 in the interactive size chart →
Full detail: W40×392 · W40×397. Verify critical dimensions against the current AISC Steel Construction Manual before fabrication.
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