S20X66 Steel S-shape — Section Properties
Dimensions
| Property | Value | Unit |
|---|---|---|
| Depth (d) | 20 | 508.0 mm |
| Flange Width (bf) | 6.26 | 15.90 cm |
| Flange Thickness (tf) | 0.795 | 20.2 mm |
| Web Thickness (tw) | 0.505 | 12.8 mm |
| Area (A) | 19.4 in² | 125.2 cm² |
| Weight | 66 lb/ft | 98.2 kg/m |
Elastic Section Properties
| Property | Strong Axis (X-X) | Weak Axis (Y-Y) | Unit |
|---|---|---|---|
| Moment of Inertia (I) | 1190 | 27.5 | in⁴ |
| Elastic Section Modulus (S) | 119 | 8.78 | in³ |
| Plastic Section Modulus (Z) | 139 | 15.4 | in³ |
| Radius of Gyration (r) | 7.83 | 1.19 | in |
Torsional Properties
| Property | Value | Unit |
|---|---|---|
| Torsional Constant (J) | 3.58 | in⁴ |
| Warping Constant (Cw) | 2530 | in⁶ |
| Distance Between Flange Centroids (ho) | 19.2 | in |
| Effective Radius (rts) | 1.49 | in |
Design Resources
- Beam Capacity Calculator — Check S20X66 for your span and loads
- Column Capacity Calculator — Check S20X66 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 S20X66 beam? 66 lb/ft (98.2 kg/m).
What is the section modulus of S20X66? Sx = 119 in³, Zx = 139 in³ (strong axis). Sy = 8.78 in³, Zy = 15.4 in³ (weak axis).
What steel grade is standard for S20X66? ASTM A36 (Fy = 36 ksi) for S-shapes. Verify with mill certificate.
What is the moment of inertia of S20X66? Ix = 1190 in⁴ about the strong axis and Iy = 27.5 in⁴ about the weak axis. The radius of gyration is rx = 7.83 in and ry = 1.19 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.