Dimensions and section properties for W8X21

Structural sectional properties for a W8X21 standard steel section

steel section diagram

US Customary Units

DescriptionSymbolValue
Shape Category / DesignationTypeW
Section NameNameW8X21
Cross Sectional AreaA6.16 in2
Section Widthb5.27 in
Section Depthd8.28 in
Flange thicknesstf0.4 in
Web thicknesstw0.25 in
Radius of Gyration about X-Xrx3.49 in
Radius of Gyrations about Y-Yry1.26 in
Moment of Inertia about X-XIx75.3 in4
Moment of Intertia about Y-YIy9.77 in4
Elastic Section Modulus about X-XSx18.2 in3
Elastic Section Modulus about Y-YSy3.71 in3
Plastic Section Modulus about X-XZx20.4 in3
Plastic Section Modulus about Y-YZy5.69 in3
St. Venant Torsional ConstantJ0.282 in4
Warping Torsion ConstantCw152 in6
Self Weight of sectionWeight21 lb/ft

Metric Units

DescriptionSymbolValue
Shape Category / DesignationTypeW
Section NameNameW8X21
Cross Sectional AreaA3974 mm2
Section Widthb134 mm
Section Depthd210 mm
Flange thicknesstf10.2 mm
Web thicknesstw6.4 mm
Radius of Gyration about X-Xrx89 mm
Radius of Gyrations about Y-Yry32 mm
Moment of Inertia about X-XIx31000000 mm4
Moment of Intertia about Y-YIy4000000 mm4
Elastic Section Modulus about X-XSx298000 mm3
Elastic Section Modulus about Y-YSy61000 mm3
Plastic Section Modulus about X-XZx334000 mm3
Plastic Section Modulus about Y-YZy93000 mm3
St. Venant Torsional ConstantJ117000 mm4
Warping Torsion ConstantCw41000000000 mm6
Self Weight of sectionWeight31 kg/m

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

A W8X21 steel section is a standard North American steel section in the W - Wide Flange category. It weighs 21 lb/ft and has a cross sectional area of 6.16 in2. The height and width of the section are 8.28 in and 5.27 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