W10×33 vs W10×39
A side-by-side comparison of two AISC wide-flange beams, 16th Edition. Detailing dimensions to the nearest 1/16 in.
W10×39 is the heavier section at 39 lb per foot, versus 33 for W10×33 (6 lb/ft more).
Both are nominally 10 in. deep.
W10×39 has the greater bending strength: section modulus Sx of 42.1 in³ versus 35, about 20% more.
| Property | W10×33 | W10×39 |
|---|---|---|
| Weight | 33 lb/ft | 39 lb/ft |
| Depth (d) | 9 3/4" | 9 7/8" |
| Flange width (bf) | 8" | 8" |
| Web thickness (tw) | 5/16" | 5/16" |
| Flange thickness (tf) | 7/16" | 1/2" |
| Area (A) | 9.71 in² | 11.5 in² |
| Moment of inertia (Ix) | 171 in⁴ | 209 in⁴ |
| Section modulus (Sx) | 35 in³ | 42.1 in³ |
| Plastic modulus (Zx) | 38.8 in³ | 46.8 in³ |
Open W10×33 in the interactive size chart →
Full detail: W10×33 · W10×39. Verify critical dimensions against the current AISC Steel Construction Manual before fabrication.
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