ST12X40 Steel ST-shape — Section Properties
Dimensions
| Property | Value | Unit |
|---|---|---|
| Depth (d) | 12 | 304.8 mm |
| Flange Width (bf) | 7 | 17.78 cm |
| Flange Thickness (tf) | 0.87 | 22.1 mm |
| Web Thickness (tw) | 0.5 | 12.7 mm |
| Area (A) | 11.7 in² | 75.5 cm² |
| Weight | 40 lb/ft | 59.5 kg/m |
Elastic Section Properties
| Property | Strong Axis (X-X) | Weak Axis (Y-Y) | Unit |
|---|---|---|---|
| Moment of Inertia (I) | 162 | 21 | in⁴ |
| Elastic Section Modulus (S) | 18.6 | 6 | in³ |
| Plastic Section Modulus (Z) | 33.6 | 10.4 | in³ |
| Radius of Gyration (r) | 3.72 | 1.34 | in |
Torsional Properties
| Property | Value | Unit |
|---|---|---|
| Torsional Constant (J) | 2.44 | in⁴ |
| Warping Constant (Cw) | 6.94 | 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 ST12X40 tee? 40 lb/ft (59.5 kg/m).
What is the section modulus of ST12X40? Sx = 18.6 in³, Zx = 33.6 in³ (strong axis). Sy = 6 in³, Zy = 10.4 in³ (weak axis).
What steel grade is standard for ST12X40? ASTM A36 (Fy = 36 ksi) for ST-shapes. Verify with mill certificate.
What is the moment of inertia of ST12X40? Ix = 162 in⁴ about the strong axis and Iy = 21 in⁴ about the weak axis. The radius of gyration is rx = 3.72 in and ry = 1.34 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.