Dimensions and section properties for W8X18

Structural sectional properties for a W8X18 standard steel section

steel section diagram

US Customary Units

DescriptionSymbolValue
Shape Category / DesignationTypeW
Section NameNameW8X18
Cross Sectional AreaA5.26 in2
Section Widthb5.25 in
Section Depthd8.14 in
Flange thicknesstf0.33 in
Web thicknesstw0.23 in
Radius of Gyration about X-Xrx3.43 in
Radius of Gyrations about Y-Yry1.23 in
Moment of Inertia about X-XIx61.9 in4
Moment of Intertia about Y-YIy7.97 in4
Elastic Section Modulus about X-XSx15.2 in3
Elastic Section Modulus about Y-YSy3.04 in3
Plastic Section Modulus about X-XZx17 in3
Plastic Section Modulus about Y-YZy4.66 in3
St. Venant Torsional ConstantJ0.172 in4
Warping Torsion ConstantCw122 in6
Self Weight of sectionWeight18 lb/ft

Metric Units

DescriptionSymbolValue
Shape Category / DesignationTypeW
Section NameNameW8X18
Cross Sectional AreaA3394 mm2
Section Widthb133 mm
Section Depthd207 mm
Flange thicknesstf8.4 mm
Web thicknesstw5.8 mm
Radius of Gyration about X-Xrx87 mm
Radius of Gyrations about Y-Yry31 mm
Moment of Inertia about X-XIx26000000 mm4
Moment of Intertia about Y-YIy3000000 mm4
Elastic Section Modulus about X-XSx249000 mm3
Elastic Section Modulus about Y-YSy50000 mm3
Plastic Section Modulus about X-XZx279000 mm3
Plastic Section Modulus about Y-YZy76000 mm3
St. Venant Torsional ConstantJ72000 mm4
Warping Torsion ConstantCw33000000000 mm6
Self Weight of sectionWeight27 kg/m

Note: Metric units have been converted from tabulated imperial values and rounded to a reasonable number of significant figures.

A W8X18 steel section is a standard North American steel section in the W - Wide Flange category. It weighs 18 lb/ft and has a cross sectional area of 5.26 in2. The height and width of the section are 8.14 in and 5.25 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