W10×45 vs W12×45
A side-by-side comparison of two AISC wide-flange beams, 16th Edition. Detailing dimensions to the nearest 1/16 in.
W10×45 and W12×45 both weigh 45 lb per foot, so the choice comes down to depth and stiffness rather than weight.
W12×45 is the deeper section at a nominal 12 in., versus 10 in.
W12×45 has the greater bending strength: section modulus Sx of 57.7 in³ versus 49.1, about 18% more.
| Property | W10×45 | W12×45 |
|---|---|---|
| Weight | 45 lb/ft | 45 lb/ft |
| Depth (d) | 10 1/8" | 12" |
| Flange width (bf) | 8" | 8" |
| Web thickness (tw) | 3/8" | 5/16" |
| Flange thickness (tf) | 5/8" | 9/16" |
| Area (A) | 13.3 in² | 13.1 in² |
| Moment of inertia (Ix) | 248 in⁴ | 348 in⁴ |
| Section modulus (Sx) | 49.1 in³ | 57.7 in³ |
| Plastic modulus (Zx) | 54.9 in³ | 64.2 in³ |
Open W10×45 in the interactive size chart →
Full detail: W10×45 · W12×45. Verify critical dimensions against the current AISC Steel Construction Manual before fabrication.
Browse more: size comparisons · Steel Beam Size Chart