W18×158 vs W18×175
A side-by-side comparison of two AISC wide-flange beams, 16th Edition. Detailing dimensions to the nearest 1/16 in.
W18×175 is the heavier section at 175 lb per foot, versus 158 for W18×158 (17 lb/ft more).
Both are nominally 18 in. deep.
W18×175 has the greater bending strength: section modulus Sx of 344 in³ versus 310, about 11% more.
| Property | W18×158 | W18×175 |
|---|---|---|
| Weight | 158 lb/ft | 175 lb/ft |
| Depth (d) | 19 3/4" | 20" |
| Flange width (bf) | 11 1/4" | 11 3/8" |
| Web thickness (tw) | 13/16" | 7/8" |
| Flange thickness (tf) | 1 7/16" | 1 9/16" |
| Area (A) | 46.3 in² | 51.4 in² |
| Moment of inertia (Ix) | 3060 in⁴ | 3450 in⁴ |
| Section modulus (Sx) | 310 in³ | 344 in³ |
| Plastic modulus (Zx) | 356 in³ | 398 in³ |
Open W18×158 in the interactive size chart →
Full detail: W18×158 · W18×175. Verify critical dimensions against the current AISC Steel Construction Manual before fabrication.
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