MC18X51.9 Steel MC-shape — Section Properties
Dimensions
| Property | Value | Unit |
|---|---|---|
| Depth (d) | 18 | 457.2 mm |
| Flange Width (bf) | 4.1 | 10.41 cm |
| Flange Thickness (tf) | 0.625 | 15.9 mm |
| Web Thickness (tw) | 0.6 | 15.2 mm |
| Area (A) | 15.3 in² | 98.7 cm² |
| Weight | 51.9 lb/ft | 77.2 kg/m |
Elastic Section Properties
| Property | Strong Axis (X-X) | Weak Axis (Y-Y) | Unit |
|---|---|---|---|
| Moment of Inertia (I) | 627 | 16.3 | in⁴ |
| Elastic Section Modulus (S) | 69.6 | 5.02 | in³ |
| Plastic Section Modulus (Z) | 87.3 | 9.86 | in³ |
| Radius of Gyration (r) | 6.41 | 1.03 | in |
Torsional Properties
| Property | Value | Unit |
|---|---|---|
| Torsional Constant (J) | 2.03 | in⁴ |
| Warping Constant (Cw) | 985 | in⁶ |
| Distance Between Flange Centroids (ho) | 17.4 | in |
| Effective Radius (rts) | 1.35 | in |
Design Resources
- Beam Capacity Calculator — Check MC18X51.9 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 MC18X51.9 channel? 51.9 lb/ft (77.2 kg/m).
What is the section modulus of MC18X51.9? Sx = 69.6 in³, Zx = 87.3 in³ (strong axis). Sy = 5.02 in³, Zy = 9.86 in³ (weak axis).
What steel grade is standard for MC18X51.9? ASTM A36 (Fy = 36 ksi) for MC-shapes. Verify with mill certificate.
What is the moment of inertia of MC18X51.9? Ix = 627 in⁴ about the strong axis and Iy = 16.3 in⁴ about the weak axis. The radius of gyration is rx = 6.41 in and ry = 1.03 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.