M5X18.9 Steel Miscellaneous beam — Section Properties
Dimensions
| Property | Value | Unit |
|---|---|---|
| Depth (d) | 5 | 127.0 mm |
| Flange Width (bf) | 5 | 12.70 cm |
| Flange Thickness (tf) | 0.416 | 10.6 mm |
| Web Thickness (tw) | 0.316 | 8.0 mm |
| Area (A) | 5.56 in² | 35.9 cm² |
| Weight | 18.9 lb/ft | 28.1 kg/m |
Elastic Section Properties
| Property | Strong Axis (X-X) | Weak Axis (Y-Y) | Unit |
|---|---|---|---|
| Moment of Inertia (I) | 24.2 | 8.7 | in⁴ |
| Elastic Section Modulus (S) | 9.67 | 3.48 | in³ |
| Plastic Section Modulus (Z) | 11.1 | 5.33 | in³ |
| Radius of Gyration (r) | 2.08 | 1.25 | in |
Torsional Properties
| Property | Value | Unit |
|---|---|---|
| Torsional Constant (J) | 0.313 | in⁴ |
| Warping Constant (Cw) | 45.7 | in⁶ |
| Distance Between Flange Centroids (ho) | 4.58 | in |
| Effective Radius (rts) | 1.44 | in |
Design Resources
- Beam Capacity Calculator — Check M5X18.9 for your span and loads
- Column Capacity Calculator — Check M5X18.9 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 M5X18.9 beam? 18.9 lb/ft (28.1 kg/m).
What is the section modulus of M5X18.9? Sx = 9.67 in³, Zx = 11.1 in³ (strong axis). Sy = 3.48 in³, Zy = 5.33 in³ (weak axis).
What steel grade is standard for M5X18.9? ASTM A36 (Fy = 36 ksi) for M-shapes. Verify with mill certificate.
What is the moment of inertia of M5X18.9? Ix = 24.2 in⁴ about the strong axis and Iy = 8.7 in⁴ about the weak axis. The radius of gyration is rx = 2.08 in and ry = 1.25 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.