W33×387 vs W36×387
A side-by-side comparison of two AISC wide-flange beams, 16th Edition. Detailing dimensions to the nearest 1/16 in.
W33×387 and W36×387 both weigh 387 lb per foot, so the choice comes down to depth and stiffness rather than weight.
W36×387 is the deeper section at a nominal 36 in., versus 33 in.
W36×387 has the greater bending strength: section modulus Sx of 1360 in³ versus 1350, about 1% more.
| Property | W33×387 | W36×387 |
|---|---|---|
| Weight | 387 lb/ft | 387 lb/ft |
| Depth (d) | 36" | 39 1/8" |
| Flange width (bf) | 16 1/4" | 12 3/4" |
| Web thickness (tw) | 1 1/4" | 1 7/16" |
| Flange thickness (tf) | 2 1/4" | 2 9/16" |
| Area (A) | 114 in² | 114 in² |
| Moment of inertia (Ix) | 24300 in⁴ | 26500 in⁴ |
| Section modulus (Sx) | 1350 in³ | 1360 in³ |
| Plastic modulus (Zx) | 1560 in³ | 1610 in³ |
Open W33×387 in the interactive size chart →
Full detail: W33×387 · W36×387. Verify critical dimensions against the current AISC Steel Construction Manual before fabrication.
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