W40×372 vs W40×392
A side-by-side comparison of two AISC wide-flange beams, 16th Edition. Detailing dimensions to the nearest 1/16 in.
W40×392 is the heavier section at 392 lb per foot, versus 372 for W40×372 (20 lb/ft more).
Both are nominally 40 in. deep.
W40×372 has the greater bending strength: section modulus Sx of 1460 in³ versus 1440, about 1% more.
| Property | W40×372 | W40×392 |
|---|---|---|
| Weight | 372 lb/ft | 392 lb/ft |
| Depth (d) | 40 5/8" | 41 5/8" |
| Flange width (bf) | 16 1/8" | 12 3/8" |
| Web thickness (tw) | 1 3/16" | 1 7/16" |
| Flange thickness (tf) | 2 1/16" | 2 1/2" |
| Area (A) | 110 in² | 116 in² |
| Moment of inertia (Ix) | 29600 in⁴ | 29900 in⁴ |
| Section modulus (Sx) | 1460 in³ | 1440 in³ |
| Plastic modulus (Zx) | 1680 in³ | 1710 in³ |
Open W40×372 in the interactive size chart →
Full detail: W40×372 · W40×392. Verify critical dimensions against the current AISC Steel Construction Manual before fabrication.
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