MC18X45.8 Steel MC-shape — Section Properties
Dimensions
| Property | Value | Unit |
|---|---|---|
| Depth (d) | 18 | 457.2 mm |
| Flange Width (bf) | 4 | 10.16 cm |
| Flange Thickness (tf) | 0.625 | 15.9 mm |
| Web Thickness (tw) | 0.5 | 12.7 mm |
| Area (A) | 13.5 in² | 87.1 cm² |
| Weight | 45.8 lb/ft | 68.2 kg/m |
Elastic Section Properties
| Property | Strong Axis (X-X) | Weak Axis (Y-Y) | Unit |
|---|---|---|---|
| Moment of Inertia (I) | 578 | 14.9 | in⁴ |
| Elastic Section Modulus (S) | 64.2 | 4.77 | in³ |
| Plastic Section Modulus (Z) | 79.2 | 9.14 | in³ |
| Radius of Gyration (r) | 6.55 | 1.05 | in |
Torsional Properties
| Property | Value | Unit |
|---|---|---|
| Torsional Constant (J) | 1.45 | in⁴ |
| Warping Constant (Cw) | 897 | in⁶ |
| Distance Between Flange Centroids (ho) | 17.4 | in |
| Effective Radius (rts) | 1.34 | in |
Design Resources
- Beam Capacity Calculator — Check MC18X45.8 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 MC18X45.8 channel? 45.8 lb/ft (68.2 kg/m).
What is the section modulus of MC18X45.8? Sx = 64.2 in³, Zx = 79.2 in³ (strong axis). Sy = 4.77 in³, Zy = 9.14 in³ (weak axis).
What steel grade is standard for MC18X45.8? ASTM A36 (Fy = 36 ksi) for MC-shapes. Verify with mill certificate.
What is the moment of inertia of MC18X45.8? Ix = 578 in⁴ about the strong axis and Iy = 14.9 in⁴ about the weak axis. The radius of gyration is rx = 6.55 in and ry = 1.05 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.