MC3X7.1 Steel MC-shape — Section Properties
Dimensions
| Property | Value | Unit |
|---|---|---|
| Depth (d) | 3 | 76.2 mm |
| Flange Width (bf) | 1.94 | 4.93 cm |
| Flange Thickness (tf) | 0.351 | 8.9 mm |
| Web Thickness (tw) | 0.312 | 7.9 mm |
| Area (A) | 2.11 in² | 13.6 cm² |
| Weight | 7.1 lb/ft | 10.6 kg/m |
Elastic Section Properties
| Property | Strong Axis (X-X) | Weak Axis (Y-Y) | Unit |
|---|---|---|---|
| Moment of Inertia (I) | 2.72 | 0.666 | in⁴ |
| Elastic Section Modulus (S) | 1.81 | 0.518 | in³ |
| Plastic Section Modulus (Z) | 2.24 | 0.998 | in³ |
| Radius of Gyration (r) | 1.14 | 0.562 | in |
Torsional Properties
| Property | Value | Unit |
|---|---|---|
| Torsional Constant (J) | 0.093 | in⁴ |
| Warping Constant (Cw) | 0.915 | in⁶ |
| Distance Between Flange Centroids (ho) | 2.65 | in |
| Effective Radius (rts) | 0.657 | in |
Design Resources
- Beam Capacity Calculator — Check MC3X7.1 for your span and loads
- 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 MC3X7.1 channel? 7.1 lb/ft (10.6 kg/m).
What is the section modulus of MC3X7.1? Sx = 1.81 in³, Zx = 2.24 in³ (strong axis). Sy = 0.518 in³, Zy = 0.998 in³ (weak axis).
What steel grade is standard for MC3X7.1? ASTM A36 (Fy = 36 ksi) for MC-shapes. Verify with mill certificate.
What is the moment of inertia of MC3X7.1? Ix = 2.72 in⁴ about the strong axis and Iy = 0.666 in⁴ about the weak axis. The radius of gyration is rx = 1.14 in and ry = 0.562 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.