ST6X20.4 Steel ST-shape — Section Properties
Dimensions
| Property | Value | Unit |
|---|---|---|
| Depth (d) | 6 | 152.4 mm |
| Flange Width (bf) | 5.25 | 13.34 cm |
| Flange Thickness (tf) | 0.659 | 16.7 mm |
| Web Thickness (tw) | 0.462 | 11.7 mm |
| Area (A) | 5.96 in² | 38.5 cm² |
| Weight | 20.4 lb/ft | 30.4 kg/m |
Elastic Section Properties
| Property | Strong Axis (X-X) | Weak Axis (Y-Y) | Unit |
|---|---|---|---|
| Moment of Inertia (I) | 18.9 | 6.74 | in⁴ |
| Elastic Section Modulus (S) | 4.27 | 2.57 | in³ |
| Plastic Section Modulus (Z) | 7.71 | 4.43 | in³ |
| Radius of Gyration (r) | 1.78 | 1.06 | in |
Torsional Properties
| Property | Value | Unit |
|---|---|---|
| Torsional Constant (J) | 0.842 | in⁴ |
| Warping Constant (Cw) | 0.787 | 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 ST6X20.4 tee? 20.4 lb/ft (30.4 kg/m).
What is the section modulus of ST6X20.4? Sx = 4.27 in³, Zx = 7.71 in³ (strong axis). Sy = 2.57 in³, Zy = 4.43 in³ (weak axis).
What steel grade is standard for ST6X20.4? ASTM A36 (Fy = 36 ksi) for ST-shapes. Verify with mill certificate.
What is the moment of inertia of ST6X20.4? Ix = 18.9 in⁴ about the strong axis and Iy = 6.74 in⁴ about the weak axis. The radius of gyration is rx = 1.78 in and ry = 1.06 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.