HSS18X8X5/16 Steel Rectangular HSS — Section Properties
Dimensions
| Property | Value | Unit |
|---|---|---|
| Height (h) | 18 | 457.2 mm |
| Width (w) | 8 | 203.2 mm |
| Wall Thickness (t) | 0.313 | 7.9 mm |
| Area (A) | 14.6 in² | 94.2 cm² |
| Weight | 53.11 lb/ft | 79.0 kg/m |
Elastic Section Properties
| Property | Strong Axis (X-X) | Weak Axis (Y-Y) | Unit |
|---|---|---|---|
| Moment of Inertia (I) | 604 | 172 | in⁴ |
| Elastic Section Modulus (S) | 67.1 | 43 | in³ |
| Plastic Section Modulus (Z) | 83.4 | 47.5 | in³ |
| Radius of Gyration (r) | 6.44 | 3.44 | in |
Torsional Properties
| Property | Value | Unit |
|---|---|---|
| Torsional Constant (J) | 432 | in⁴ |
| Warping Constant (Cw) | 0 | in⁶ |
Design Resources
- Section Properties Database — Compare with other sections
- Steel Grades Reference — Material properties
Frequently Asked Questions
What is the weight of a HSS18X8X5/16 section? 53.11 lb/ft (79.0 kg/m).
What is the section modulus of HSS18X8X5/16? Sx = 67.1 in³, Zx = 83.4 in³ (strong axis). Sy = 43 in³, Zy = 47.5 in³ (weak axis).
What steel grade is standard for HSS18X8X5/16? ASTM A500 Grade C (Fy = 50 ksi) or Grade B (Fy = 46 ksi). Verify with mill certificate.
What is the moment of inertia of HSS18X8X5/16? Ix = 604 in⁴ about the strong axis and Iy = 172 in⁴ about the weak axis. The radius of gyration is rx = 6.44 in and ry = 3.44 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.