S12X40.8 Steel S-shape — Section Properties
Dimensions
| Property | Value | Unit |
|---|---|---|
| Depth (d) | 12 | 304.8 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) | 11.9 in² | 76.8 cm² |
| Weight | 40.8 lb/ft | 60.7 kg/m |
Elastic Section Properties
| Property | Strong Axis (X-X) | Weak Axis (Y-Y) | Unit |
|---|---|---|---|
| Moment of Inertia (I) | 270 | 13.5 | in⁴ |
| Elastic Section Modulus (S) | 45.1 | 5.13 | in³ |
| Plastic Section Modulus (Z) | 52.7 | 8.86 | in³ |
| Radius of Gyration (r) | 4.76 | 1.06 | in |
Torsional Properties
| Property | Value | Unit |
|---|---|---|
| Torsional Constant (J) | 1.69 | in⁴ |
| Warping Constant (Cw) | 433 | in⁶ |
| Distance Between Flange Centroids (ho) | 11.3 | in |
| Effective Radius (rts) | 1.3 | in |
Design Resources
- Beam Capacity Calculator — Check S12X40.8 for your span and loads
- Column Capacity Calculator — Check S12X40.8 as a column
- 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 S12X40.8 beam? 40.8 lb/ft (60.7 kg/m).
What is the section modulus of S12X40.8? Sx = 45.1 in³, Zx = 52.7 in³ (strong axis). Sy = 5.13 in³, Zy = 8.86 in³ (weak axis).
What steel grade is standard for S12X40.8? ASTM A36 (Fy = 36 ksi) for S-shapes. Verify with mill certificate.
What is the moment of inertia of S12X40.8? Ix = 270 in⁴ about the strong axis and Iy = 13.5 in⁴ about the weak axis. The radius of gyration is rx = 4.76 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.