W30×357 vs W30×391
A side-by-side comparison of two AISC wide-flange beams, 16th Edition. Detailing dimensions to the nearest 1/16 in.
W30×391 is the heavier section at 391 lb per foot, versus 357 for W30×357 (34 lb/ft more).
Both are nominally 30 in. deep.
W30×391 has the greater bending strength: section modulus Sx of 1250 in³ versus 1140, about 10% more.
| Property | W30×357 | W30×391 |
|---|---|---|
| Weight | 357 lb/ft | 391 lb/ft |
| Depth (d) | 32 3/4" | 33 1/4" |
| Flange width (bf) | 15 1/2" | 15 5/8" |
| Web thickness (tw) | 1 1/4" | 1 3/8" |
| Flange thickness (tf) | 2 1/4" | 2 7/16" |
| Area (A) | 105 in² | 115 in² |
| Moment of inertia (Ix) | 18700 in⁴ | 20700 in⁴ |
| Section modulus (Sx) | 1140 in³ | 1250 in³ |
| Plastic modulus (Zx) | 1320 in³ | 1450 in³ |
Open W30×357 in the interactive size chart →
Full detail: W30×357 · W30×391. Verify critical dimensions against the current AISC Steel Construction Manual before fabrication.
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