W10×39 vs W10×45
A side-by-side comparison of two AISC wide-flange beams, 16th Edition. Detailing dimensions to the nearest 1/16 in.
W10×45 is the heavier section at 45 lb per foot, versus 39 for W10×39 (6 lb/ft more).
Both are nominally 10 in. deep.
W10×45 has the greater bending strength: section modulus Sx of 49.1 in³ versus 42.1, about 17% more.
| Property | W10×39 | W10×45 |
|---|---|---|
| Weight | 39 lb/ft | 45 lb/ft |
| Depth (d) | 9 7/8" | 10 1/8" |
| Flange width (bf) | 8" | 8" |
| Web thickness (tw) | 5/16" | 3/8" |
| Flange thickness (tf) | 1/2" | 5/8" |
| Area (A) | 11.5 in² | 13.3 in² |
| Moment of inertia (Ix) | 209 in⁴ | 248 in⁴ |
| Section modulus (Sx) | 42.1 in³ | 49.1 in³ |
| Plastic modulus (Zx) | 46.8 in³ | 54.9 in³ |
Open W10×39 in the interactive size chart →
Full detail: W10×39 · W10×45. Verify critical dimensions against the current AISC Steel Construction Manual before fabrication.
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