MC8X21.4 Steel MC-shape — Section Properties
Dimensions
| Property | Value | Unit |
|---|---|---|
| Depth (d) | 8 | 203.2 mm |
| Flange Width (bf) | 3.45 | 8.76 cm |
| Flange Thickness (tf) | 0.525 | 13.3 mm |
| Web Thickness (tw) | 0.375 | 9.5 mm |
| Area (A) | 6.28 in² | 40.5 cm² |
| Weight | 21.4 lb/ft | 31.8 kg/m |
Elastic Section Properties
| Property | Strong Axis (X-X) | Weak Axis (Y-Y) | Unit |
|---|---|---|---|
| Moment of Inertia (I) | 61.5 | 6.58 | in⁴ |
| Elastic Section Modulus (S) | 15.4 | 2.71 | in³ |
| Plastic Section Modulus (Z) | 18.2 | 5.18 | in³ |
| Radius of Gyration (r) | 3.13 | 1.02 | in |
Torsional Properties
| Property | Value | Unit |
|---|---|---|
| Torsional Constant (J) | 0.495 | in⁴ |
| Warping Constant (Cw) | 70.8 | in⁶ |
| Distance Between Flange Centroids (ho) | 7.48 | in |
| Effective Radius (rts) | 1.18 | in |
Design Resources
- Beam Capacity Calculator — Check MC8X21.4 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 MC8X21.4 channel? 21.4 lb/ft (31.8 kg/m).
What is the section modulus of MC8X21.4? Sx = 15.4 in³, Zx = 18.2 in³ (strong axis). Sy = 2.71 in³, Zy = 5.18 in³ (weak axis).
What steel grade is standard for MC8X21.4? ASTM A36 (Fy = 36 ksi) for MC-shapes. Verify with mill certificate.
What is the moment of inertia of MC8X21.4? Ix = 61.5 in⁴ about the strong axis and Iy = 6.58 in⁴ about the weak axis. The radius of gyration is rx = 3.13 in and ry = 1.02 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.