W18×143 vs W18×158
A side-by-side comparison of two AISC wide-flange beams, 16th Edition. Detailing dimensions to the nearest 1/16 in.
W18×158 is the heavier section at 158 lb per foot, versus 143 for W18×143 (15 lb/ft more).
Both are nominally 18 in. deep.
W18×158 has the greater bending strength: section modulus Sx of 310 in³ versus 282, about 10% more.
| Property | W18×143 | W18×158 |
|---|---|---|
| Weight | 143 lb/ft | 158 lb/ft |
| Depth (d) | 19 1/2" | 19 3/4" |
| Flange width (bf) | 11 1/4" | 11 1/4" |
| Web thickness (tw) | 3/4" | 13/16" |
| Flange thickness (tf) | 1 5/16" | 1 7/16" |
| Area (A) | 42 in² | 46.3 in² |
| Moment of inertia (Ix) | 2750 in⁴ | 3060 in⁴ |
| Section modulus (Sx) | 282 in³ | 310 in³ |
| Plastic modulus (Zx) | 322 in³ | 356 in³ |
Open W18×143 in the interactive size chart →
Full detail: W18×143 · W18×158. Verify critical dimensions against the current AISC Steel Construction Manual before fabrication.
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