Dimensions and section properties for W18X40

Structural sectional properties for a W18X40 standard steel section

steel section diagram

US Customary Units

DescriptionSymbolValue
Shape Category / DesignationTypeW
Section NameNameW18X40
Cross Sectional AreaA11.8 in2
Section Widthb6.02 in
Section Depthd17.9 in
Flange thicknesstf0.525 in
Web thicknesstw0.315 in
Radius of Gyration about X-Xrx7.21 in
Radius of Gyrations about Y-Yry1.27 in
Moment of Inertia about X-XIx612 in4
Moment of Intertia about Y-YIy19.1 in4
Elastic Section Modulus about X-XSx68.4 in3
Elastic Section Modulus about Y-YSy6.35 in3
Plastic Section Modulus about X-XZx78.4 in3
Plastic Section Modulus about Y-YZy10 in3
St. Venant Torsional ConstantJ0.81 in4
Warping Torsion ConstantCw1440 in6
Self Weight of sectionWeight40 lb/ft

Metric Units

DescriptionSymbolValue
Shape Category / DesignationTypeW
Section NameNameW18X40
Cross Sectional AreaA7613 mm2
Section Widthb153 mm
Section Depthd455 mm
Flange thicknesstf13.3 mm
Web thicknesstw8 mm
Radius of Gyration about X-Xrx183 mm
Radius of Gyrations about Y-Yry32 mm
Moment of Inertia about X-XIx255000000 mm4
Moment of Intertia about Y-YIy8000000 mm4
Elastic Section Modulus about X-XSx1121000 mm3
Elastic Section Modulus about Y-YSy104000 mm3
Plastic Section Modulus about X-XZx1285000 mm3
Plastic Section Modulus about Y-YZy164000 mm3
St. Venant Torsional ConstantJ337000 mm4
Warping Torsion ConstantCw387000000000 mm6
Self Weight of sectionWeight60 kg/m

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

A W18X40 steel section is a standard North American steel section in the W - Wide Flange category. It weighs 40 lb/ft and has a cross sectional area of 11.8 in2. The height and width of the section are 17.9 in and 6.02 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