W12×120 vs W14×120
A side-by-side comparison of two AISC wide-flange beams, 16th Edition. Detailing dimensions to the nearest 1/16 in.
W12×120 and W14×120 both weigh 120 lb per foot, so the choice comes down to depth and stiffness rather than weight.
W14×120 is the deeper section at a nominal 14 in., versus 12 in.
W14×120 has the greater bending strength: section modulus Sx of 190 in³ versus 163, about 17% more.
| Property | W12×120 | W14×120 |
|---|---|---|
| Weight | 120 lb/ft | 120 lb/ft |
| Depth (d) | 13 1/8" | 14 1/2" |
| Flange width (bf) | 12 3/8" | 14 5/8" |
| Web thickness (tw) | 11/16" | 9/16" |
| Flange thickness (tf) | 1 1/8" | 15/16" |
| Area (A) | 35.2 in² | 35.3 in² |
| Moment of inertia (Ix) | 1070 in⁴ | 1380 in⁴ |
| Section modulus (Sx) | 163 in³ | 190 in³ |
| Plastic modulus (Zx) | 186 in³ | 212 in³ |
Open W12×120 in the interactive size chart →
Full detail: W12×120 · W14×120. Verify critical dimensions against the current AISC Steel Construction Manual before fabrication.
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