ST7.5X21.45 Steel ST-shape — Section Properties
Dimensions
| Property | Value | Unit |
|---|---|---|
| Depth (d) | 7.5 | 190.5 mm |
| Flange Width (bf) | 5.5 | 13.97 cm |
| Flange Thickness (tf) | 0.622 | 15.8 mm |
| Web Thickness (tw) | 0.411 | 10.4 mm |
| Area (A) | 6.3 in² | 40.6 cm² |
| Weight | 21.45 lb/ft | 31.9 kg/m |
Elastic Section Properties
| Property | Strong Axis (X-X) | Weak Axis (Y-Y) | Unit |
|---|---|---|---|
| Moment of Inertia (I) | 32.9 | 7.13 | in⁴ |
| Elastic Section Modulus (S) | 5.99 | 2.59 | in³ |
| Plastic Section Modulus (Z) | 10.8 | 4.54 | in³ |
| Radius of Gyration (r) | 2.29 | 1.06 | in |
Torsional Properties
| Property | Value | Unit |
|---|---|---|
| Torsional Constant (J) | 0.765 | in⁴ |
| Warping Constant (Cw) | 0.995 | 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 ST7.5X21.45 tee? 21.45 lb/ft (31.9 kg/m).
What is the section modulus of ST7.5X21.45? Sx = 5.99 in³, Zx = 10.8 in³ (strong axis). Sy = 2.59 in³, Zy = 4.54 in³ (weak axis).
What steel grade is standard for ST7.5X21.45? ASTM A36 (Fy = 36 ksi) for ST-shapes. Verify with mill certificate.
What is the moment of inertia of ST7.5X21.45? Ix = 32.9 in⁴ about the strong axis and Iy = 7.13 in⁴ about the weak axis. The radius of gyration is rx = 2.29 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.