Dimensions and section properties for S18X70
Structural sectional properties for a S18X70 standard steel section
US Customary Units
| Description | Symbol | Value |
|---|---|---|
| Shape Category / Designation | Type | S |
| Section Name | Name | S18X70 |
| Cross Sectional Area | A | 20.5 in2 |
| Section Width | b | 6.25 in |
| Section Depth | d | 18 in |
| Flange thickness | tf | 0.691 in |
| Web thickness | tw | 0.711 in |
| Radius of Gyration about X-X | rx | 6.7 in |
| Radius of Gyrations about Y-Y | ry | 1.08 in |
| Moment of Inertia about X-X | Ix | 923 in4 |
| Moment of Intertia about Y-Y | Iy | 24 in4 |
| Elastic Section Modulus about X-X | Sx | 103 in3 |
| Elastic Section Modulus about Y-Y | Sy | 7.69 in3 |
| Plastic Section Modulus about X-X | Zx | 124 in3 |
| Plastic Section Modulus about Y-Y | Zy | 14.3 in3 |
| St. Venant Torsional Constant | J | 4.1 in4 |
| Warping Torsion Constant | Cw | 1800 in6 |
| Self Weight of section | Weight | 70 lb/ft |
Metric Units
| Description | Symbol | Value |
|---|---|---|
| Shape Category / Designation | Type | S |
| Section Name | Name | S18X70 |
| Cross Sectional Area | A | 13226 mm2 |
| Section Width | b | 159 mm |
| Section Depth | d | 457 mm |
| Flange thickness | tf | 17.6 mm |
| Web thickness | tw | 18.1 mm |
| Radius of Gyration about X-X | rx | 170 mm |
| Radius of Gyrations about Y-Y | ry | 27 mm |
| Moment of Inertia about X-X | Ix | 384000000 mm4 |
| Moment of Intertia about Y-Y | Iy | 10000000 mm4 |
| Elastic Section Modulus about X-X | Sx | 1688000 mm3 |
| Elastic Section Modulus about Y-Y | Sy | 126000 mm3 |
| Plastic Section Modulus about X-X | Zx | 2032000 mm3 |
| Plastic Section Modulus about Y-Y | Zy | 234000 mm3 |
| St. Venant Torsional Constant | J | 1707000 mm4 |
| Warping Torsion Constant | Cw | 483000000000 mm6 |
| Self Weight of section | Weight | 104 kg/m |
Note: Metric units have been converted from tabulated imperial values and rounded to a reasonable number of significant figures.
A S18X70 steel section is a standard North American steel section in the S - Standard Wide Flange category. The height and width of the section are 18 in (457 mm) and 6.25 in (159 mm) respectively. It weighs 70 lb/ft (104 kg/m) and has a cross sectional area of 20.5 in2 (13226 mm2).
The section has a tensile yield capacity of:
kip
The section has a flexural plastic moment capacity of:
kip-ft
The section has a flexural elastic moment capacity of:
kip-ft