W12×45 vs W12×50
A side-by-side comparison of two AISC wide-flange beams, 16th Edition. Detailing dimensions to the nearest 1/16 in.
W12×50 is the heavier section at 50 lb per foot, versus 45 for W12×45 (5 lb/ft more).
Both are nominally 12 in. deep.
W12×50 has the greater bending strength: section modulus Sx of 64.2 in³ versus 57.7, about 11% more.
| Property | W12×45 | W12×50 |
|---|---|---|
| Weight | 45 lb/ft | 50 lb/ft |
| Depth (d) | 12" | 12 1/4" |
| Flange width (bf) | 8" | 8 1/8" |
| Web thickness (tw) | 5/16" | 3/8" |
| Flange thickness (tf) | 9/16" | 5/8" |
| Area (A) | 13.1 in² | 14.6 in² |
| Moment of inertia (Ix) | 348 in⁴ | 391 in⁴ |
| Section modulus (Sx) | 57.7 in³ | 64.2 in³ |
| Plastic modulus (Zx) | 64.2 in³ | 71.9 in³ |
Open W12×45 in the interactive size chart →
Full detail: W12×45 · W12×50. Verify critical dimensions against the current AISC Steel Construction Manual before fabrication.
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