ST3X8.6 Steel ST-shape — Section Properties
Dimensions
| Property | Value | Unit |
|---|---|---|
| Depth (d) | 3 | 76.2 mm |
| Flange Width (bf) | 3.57 | 9.07 cm |
| Flange Thickness (tf) | 0.359 | 9.1 mm |
| Web Thickness (tw) | 0.465 | 11.8 mm |
| Area (A) | 2.53 in² | 16.3 cm² |
| Weight | 8.6 lb/ft | 12.8 kg/m |
Elastic Section Properties
| Property | Strong Axis (X-X) | Weak Axis (Y-Y) | Unit |
|---|---|---|---|
| Moment of Inertia (I) | 2.12 | 1.14 | in⁴ |
| Elastic Section Modulus (S) | 1.02 | 0.642 | in³ |
| Plastic Section Modulus (Z) | 1.85 | 1.17 | in³ |
| Radius of Gyration (r) | 0.915 | 0.673 | in |
Torsional Properties
| Property | Value | Unit |
|---|---|---|
| Torsional Constant (J) | 0.181 | in⁴ |
| Warping Constant (Cw) | 0.077 | 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 ST3X8.6 tee? 8.6 lb/ft (12.8 kg/m).
What is the section modulus of ST3X8.6? Sx = 1.02 in³, Zx = 1.85 in³ (strong axis). Sy = 0.642 in³, Zy = 1.17 in³ (weak axis).
What steel grade is standard for ST3X8.6? ASTM A36 (Fy = 36 ksi) for ST-shapes. Verify with mill certificate.
What is the moment of inertia of ST3X8.6? Ix = 2.12 in⁴ about the strong axis and Iy = 1.14 in⁴ about the weak axis. The radius of gyration is rx = 0.915 in and ry = 0.673 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.