W12×279 vs W12×305
A side-by-side comparison of two AISC wide-flange beams, 16th Edition. Detailing dimensions to the nearest 1/16 in.
W12×305 is the heavier section at 305 lb per foot, versus 279 for W12×279 (26 lb/ft more).
Both are nominally 12 in. deep.
W12×305 has the greater bending strength: section modulus Sx of 435 in³ versus 393, about 11% more.
| Property | W12×279 | W12×305 |
|---|---|---|
| Weight | 279 lb/ft | 305 lb/ft |
| Depth (d) | 15 7/8" | 16 3/8" |
| Flange width (bf) | 13 1/8" | 13 1/4" |
| Web thickness (tw) | 1 1/2" | 1 5/8" |
| Flange thickness (tf) | 2 1/2" | 2 11/16" |
| Area (A) | 81.9 in² | 89.5 in² |
| Moment of inertia (Ix) | 3110 in⁴ | 3550 in⁴ |
| Section modulus (Sx) | 393 in³ | 435 in³ |
| Plastic modulus (Zx) | 481 in³ | 537 in³ |
Open W12×279 in the interactive size chart →
Full detail: W12×279 · W12×305. Verify critical dimensions against the current AISC Steel Construction Manual before fabrication.
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