M3X2.9 Steel Miscellaneous beam — Section Properties
Dimensions
| Property | Value | Unit |
|---|---|---|
| Depth (d) | 3 | 76.2 mm |
| Flange Width (bf) | 2.25 | 5.71 cm |
| Flange Thickness (tf) | 0.13 | 3.3 mm |
| Web Thickness (tw) | 0.09 | 2.3 mm |
| Area (A) | 0.914 in² | 5.9 cm² |
| Weight | 2.9 lb/ft | 4.3 kg/m |
Elastic Section Properties
| Property | Strong Axis (X-X) | Weak Axis (Y-Y) | Unit |
|---|---|---|---|
| Moment of Inertia (I) | 1.5 | 0.248 | in⁴ |
| Elastic Section Modulus (S) | 1 | 0.221 | in³ |
| Plastic Section Modulus (Z) | 1.12 | 0.344 | in³ |
| Radius of Gyration (r) | 1.28 | 0.521 | in |
Torsional Properties
| Property | Value | Unit |
|---|---|---|
| Torsional Constant (J) | 0.008 | in⁴ |
| Warping Constant (Cw) | 0.511 | in⁶ |
| Distance Between Flange Centroids (ho) | 2.87 | in |
| Effective Radius (rts) | 0.597 | in |
Design Resources
- Beam Capacity Calculator — Check M3X2.9 for your span and loads
- Column Capacity Calculator — Check M3X2.9 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 M3X2.9 beam? 2.9 lb/ft (4.3 kg/m).
What is the section modulus of M3X2.9? Sx = 1 in³, Zx = 1.12 in³ (strong axis). Sy = 0.221 in³, Zy = 0.344 in³ (weak axis).
What steel grade is standard for M3X2.9? ASTM A36 (Fy = 36 ksi) for M-shapes. Verify with mill certificate.
What is the moment of inertia of M3X2.9? Ix = 1.5 in⁴ about the strong axis and Iy = 0.248 in⁴ about the weak axis. The radius of gyration is rx = 1.28 in and ry = 0.521 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.