WT4×20 tee (cut from a wide-flange)
Detailing dimensions and section properties from the AISC Shapes Database, 16th Edition. Values are shown to the nearest 1/16 in. as they appear on a shop drawing.
WT4×20 measures 4 1/8 in. deep with a 8 1/8 in. flange, on a 3/8 in. web and 9/16 in. flanges.
At 20 lb per foot it is one of the 13 WT4 sizes, which run from 5 to 33.5 lb/ft.
For strong-axis bending its section modulus is Sx = 1.69 in³ and its moment of inertia Ix = 5.73 in⁴, with a plastic modulus Zx = 3.25 in³.
Detailing dimensions
| Depth (d) | 4 1/8" |
|---|---|
| Flange width (bf) | 8 1/8" |
| Web thickness (tw) | 3/8" |
| Flange thickness (tf) | 9/16" |
| k (detailing) | 1 1/4" |
| Workable gage (g) | 5 1/2" |
Section properties
| Weight | 20 lb/ft |
|---|---|
| Area (A) | 5.87 in² |
| Ix | 5.73 in⁴ |
| Sx | 1.69 in³ |
| Zx | 3.25 in³ |
| rx | 0.988 in |
| Iy | 24.5 in⁴ |
| Sy | 6.08 in³ |
| Zy | 9.24 in³ |
| ry | 2.04 in |
| J | 0.558 in⁴ |
Other WT4 sizes
Same nominal size, different weight — useful when you are checking a substitution or a lighter section.
All WT4 sizes and dimensions →
Similar weight structural tees
Comparable 20 lb/ft sections in other tee sizes.
Detailing values are rounded to the nearest 1/16 in. per the AISC Steel Construction Manual. Verify critical dimensions against the current Manual before fabrication. Need WT4×20 cut, formed, or fabricated? Huntington Steel & Supply Co.
Browse more: Tees · Steel Beam Size Chart