W12×79 vs W12×87
A side-by-side comparison of two AISC wide-flange beams, 16th Edition. Detailing dimensions to the nearest 1/16 in.
W12×87 is the heavier section at 87 lb per foot, versus 79 for W12×79 (8 lb/ft more).
Both are nominally 12 in. deep.
W12×87 has the greater bending strength: section modulus Sx of 118 in³ versus 107, about 10% more.
| Property | W12×79 | W12×87 |
|---|---|---|
| Weight | 79 lb/ft | 87 lb/ft |
| Depth (d) | 12 3/8" | 12 1/2" |
| Flange width (bf) | 12 1/8" | 12 1/8" |
| Web thickness (tw) | 1/2" | 1/2" |
| Flange thickness (tf) | 3/4" | 13/16" |
| Area (A) | 23.2 in² | 25.6 in² |
| Moment of inertia (Ix) | 662 in⁴ | 740 in⁴ |
| Section modulus (Sx) | 107 in³ | 118 in³ |
| Plastic modulus (Zx) | 119 in³ | 132 in³ |
Open W12×79 in the interactive size chart →
Full detail: W12×79 · W12×87. Verify critical dimensions against the current AISC Steel Construction Manual before fabrication.
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