WT4X20 Steel WT-shape — Section Properties
Dimensions
| Property | Value | Unit |
|---|---|---|
| Depth (d) | 4.13 | 104.9 mm |
| Flange Width (bf) | 8.07 | 20.50 cm |
| Flange Thickness (tf) | 0.56 | 14.2 mm |
| Web Thickness (tw) | 0.36 | 9.1 mm |
| Area (A) | 5.87 in² | 37.9 cm² |
| Weight | 20 lb/ft | 29.8 kg/m |
Elastic Section Properties
| Property | Strong Axis (X-X) | Weak Axis (Y-Y) | Unit |
|---|---|---|---|
| Moment of Inertia (I) | 5.73 | 24.5 | in⁴ |
| Elastic Section Modulus (S) | 1.69 | 6.08 | in³ |
| Plastic Section Modulus (Z) | 3.25 | 9.24 | in³ |
| Radius of Gyration (r) | 0.988 | 2.04 | in |
Torsional Properties
| Property | Value | Unit |
|---|---|---|
| Torsional Constant (J) | 0.558 | in⁴ |
| Warping Constant (Cw) | 0.715 | in⁶ |
Design Resources
- Section Properties Database — Compare with other sections
- Steel Beam Sizes Reference — Full dimension table
- Steel Grades Reference — Material properties
Frequently Asked Questions
What is the weight of a WT4X20 tee? 20 lb/ft (29.8 kg/m).
What is the section modulus of WT4X20? Sx = 1.69 in³, Zx = 3.25 in³ (strong axis). Sy = 6.08 in³, Zy = 9.24 in³ (weak axis).
What steel grade is standard for WT4X20? ASTM A992 (Fy = 50 ksi, Fu = 65 ksi) for WT-shapes. Verify with mill certificate.
What is the moment of inertia of WT4X20? Ix = 5.73 in⁴ about the strong axis and Iy = 24.5 in⁴ about the weak axis. The radius of gyration is rx = 0.988 in and ry = 2.04 in.
Related Pages
Educational reference only. Verify all section properties against the current AISC Manual and mill certificates before design. Results are PRELIMINARY — NOT FOR CONSTRUCTION.