S18X54.7 Steel S-shape — Section Properties
Dimensions
| Property | Value | Unit |
|---|---|---|
| Depth (d) | 18 | 457.2 mm |
| Flange Width (bf) | 6 | 15.24 cm |
| Flange Thickness (tf) | 0.691 | 17.6 mm |
| Web Thickness (tw) | 0.461 | 11.7 mm |
| Area (A) | 16 in² | 103.2 cm² |
| Weight | 54.7 lb/ft | 81.4 kg/m |
Elastic Section Properties
| Property | Strong Axis (X-X) | Weak Axis (Y-Y) | Unit |
|---|---|---|---|
| Moment of Inertia (I) | 801 | 20.7 | in⁴ |
| Elastic Section Modulus (S) | 89 | 6.91 | in³ |
| Plastic Section Modulus (Z) | 104 | 12.1 | in³ |
| Radius of Gyration (r) | 7.07 | 1.14 | in |
Torsional Properties
| Property | Value | Unit |
|---|---|---|
| Torsional Constant (J) | 2.33 | in⁴ |
| Warping Constant (Cw) | 1550 | in⁶ |
| Distance Between Flange Centroids (ho) | 17.3 | in |
| Effective Radius (rts) | 1.42 | in |
Design Resources
- Beam Capacity Calculator — Check S18X54.7 for your span and loads
- Column Capacity Calculator — Check S18X54.7 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 S18X54.7 beam? 54.7 lb/ft (81.4 kg/m).
What is the section modulus of S18X54.7? Sx = 89 in³, Zx = 104 in³ (strong axis). Sy = 6.91 in³, Zy = 12.1 in³ (weak axis).
What steel grade is standard for S18X54.7? ASTM A36 (Fy = 36 ksi) for S-shapes. Verify with mill certificate.
What is the moment of inertia of S18X54.7? Ix = 801 in⁴ about the strong axis and Iy = 20.7 in⁴ about the weak axis. The radius of gyration is rx = 7.07 in and ry = 1.14 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.