Dimensions and section properties for S18X70

Structural sectional properties for a S18X70 standard steel section

steel section diagram

US Customary Units

DescriptionSymbolValue
Shape Category / DesignationTypeS
Section NameNameS18X70
Cross Sectional AreaA20.5 in2
Section Widthb6.25 in
Section Depthd18 in
Flange thicknesstf0.691 in
Web thicknesstw0.711 in
Radius of Gyration about X-Xrx6.7 in
Radius of Gyrations about Y-Yry1.08 in
Moment of Inertia about X-XIx923 in4
Moment of Intertia about Y-YIy24 in4
Elastic Section Modulus about X-XSx103 in3
Elastic Section Modulus about Y-YSy7.69 in3
Plastic Section Modulus about X-XZx124 in3
Plastic Section Modulus about Y-YZy14.3 in3
St. Venant Torsional ConstantJ4.1 in4
Warping Torsion ConstantCw1800 in6
Self Weight of sectionWeight70 lb/ft

Metric Units

DescriptionSymbolValue
Shape Category / DesignationTypeS
Section NameNameS18X70
Cross Sectional AreaA13226 mm2
Section Widthb159 mm
Section Depthd457 mm
Flange thicknesstf17.6 mm
Web thicknesstw18.1 mm
Radius of Gyration about X-Xrx170 mm
Radius of Gyrations about Y-Yry27 mm
Moment of Inertia about X-XIx384000000 mm4
Moment of Intertia about Y-YIy10000000 mm4
Elastic Section Modulus about X-XSx1688000 mm3
Elastic Section Modulus about Y-YSy126000 mm3
Plastic Section Modulus about X-XZx2032000 mm3
Plastic Section Modulus about Y-YZy234000 mm3
St. Venant Torsional ConstantJ1707000 mm4
Warping Torsion ConstantCw483000000000 mm6
Self Weight of sectionWeight104 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. It weighs 70 lb/ft and has a cross sectional area of 20.5 in2. The height and width of the section are 18 in and 6.25 in respectively.

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