W18×46 vs W18×50
A side-by-side comparison of two AISC wide-flange beams, 16th Edition. Detailing dimensions to the nearest 1/16 in.
W18×50 is the heavier section at 50 lb per foot, versus 46 for W18×46 (4 lb/ft more).
Both are nominally 18 in. deep.
W18×50 has the greater bending strength: section modulus Sx of 88.9 in³ versus 78.8, about 13% more.
| Property | W18×46 | W18×50 |
|---|---|---|
| Weight | 46 lb/ft | 50 lb/ft |
| Depth (d) | 18" | 18" |
| Flange width (bf) | 6" | 7 1/2" |
| Web thickness (tw) | 3/8" | 3/8" |
| Flange thickness (tf) | 5/8" | 9/16" |
| Area (A) | 13.5 in² | 14.7 in² |
| Moment of inertia (Ix) | 712 in⁴ | 800 in⁴ |
| Section modulus (Sx) | 78.8 in³ | 88.9 in³ |
| Plastic modulus (Zx) | 90.7 in³ | 101 in³ |
Open W18×46 in the interactive size chart →
Full detail: W18×46 · W18×50. Verify critical dimensions against the current AISC Steel Construction Manual before fabrication.
Browse more: size comparisons · Steel Beam Size Chart