W6×16 vs W6×20
A side-by-side comparison of two AISC wide-flange beams, 16th Edition. Detailing dimensions to the nearest 1/16 in.
W6×20 is the heavier section at 20 lb per foot, versus 16 for W6×16 (4 lb/ft more).
Both are nominally 6 in. deep.
W6×20 has the greater bending strength: section modulus Sx of 13.4 in³ versus 10.2, about 31% more.
| Property | W6×16 | W6×20 |
|---|---|---|
| Weight | 16 lb/ft | 20 lb/ft |
| Depth (d) | 6 1/4" | 6 1/4" |
| Flange width (bf) | 4" | 6" |
| Web thickness (tw) | 1/4" | 1/4" |
| Flange thickness (tf) | 3/8" | 3/8" |
| Area (A) | 4.74 in² | 5.87 in² |
| Moment of inertia (Ix) | 32.1 in⁴ | 41.4 in⁴ |
| Section modulus (Sx) | 10.2 in³ | 13.4 in³ |
| Plastic modulus (Zx) | 11.7 in³ | 14.9 in³ |
Open W6×16 in the interactive size chart →
Full detail: W6×16 · W6×20. Verify critical dimensions against the current AISC Steel Construction Manual before fabrication.
Browse more: size comparisons · Steel Beam Size Chart