W12×106 vs W18×106
A side-by-side comparison of two AISC wide-flange beams, 16th Edition. Detailing dimensions to the nearest 1/16 in.
W12×106 and W18×106 both weigh 106 lb per foot, so the choice comes down to depth and stiffness rather than weight.
W18×106 is the deeper section at a nominal 18 in., versus 12 in.
W18×106 has the greater bending strength: section modulus Sx of 204 in³ versus 145, about 41% more.
| Property | W12×106 | W18×106 |
|---|---|---|
| Weight | 106 lb/ft | 106 lb/ft |
| Depth (d) | 12 7/8" | 18 3/4" |
| Flange width (bf) | 12 1/4" | 11 1/4" |
| Web thickness (tw) | 5/8" | 9/16" |
| Flange thickness (tf) | 1" | 15/16" |
| Area (A) | 31.2 in² | 31.1 in² |
| Moment of inertia (Ix) | 933 in⁴ | 1910 in⁴ |
| Section modulus (Sx) | 145 in³ | 204 in³ |
| Plastic modulus (Zx) | 164 in³ | 230 in³ |
Open W12×106 in the interactive size chart →
Full detail: W12×106 · W18×106. Verify critical dimensions against the current AISC Steel Construction Manual before fabrication.
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