W27×161 vs W27×178
A side-by-side comparison of two AISC wide-flange beams, 16th Edition. Detailing dimensions to the nearest 1/16 in.
W27×178 is the heavier section at 178 lb per foot, versus 161 for W27×161 (17 lb/ft more).
Both are nominally 27 in. deep.
W27×178 has the greater bending strength: section modulus Sx of 505 in³ versus 458, about 10% more.
| Property | W27×161 | W27×178 |
|---|---|---|
| Weight | 161 lb/ft | 178 lb/ft |
| Depth (d) | 27 5/8" | 27 3/4" |
| Flange width (bf) | 14" | 14 1/8" |
| Web thickness (tw) | 11/16" | 3/4" |
| Flange thickness (tf) | 1 1/16" | 1 3/16" |
| Area (A) | 47.6 in² | 52.5 in² |
| Moment of inertia (Ix) | 6310 in⁴ | 7020 in⁴ |
| Section modulus (Sx) | 458 in³ | 505 in³ |
| Plastic modulus (Zx) | 515 in³ | 570 in³ |
Open W27×161 in the interactive size chart →
Full detail: W27×161 · W27×178. Verify critical dimensions against the current AISC Steel Construction Manual before fabrication.
Browse more: size comparisons · Steel Beam Size Chart