Dimensions and section properties for W21X122

Structural sectional properties for a W21X122 standard steel section

steel section diagram

US Customary Units

DescriptionSymbolValue
Shape Category / DesignationTypeW
Section NameNameW21X122
Cross Sectional AreaA35.9 in2
Section Widthb12.4 in
Section Depthd21.7 in
Flange thicknesstf0.96 in
Web thicknesstw0.6 in
Radius of Gyration about X-Xrx9.09 in
Radius of Gyrations about Y-Yry2.92 in
Moment of Inertia about X-XIx2960 in4
Moment of Intertia about Y-YIy305 in4
Elastic Section Modulus about X-XSx273 in3
Elastic Section Modulus about Y-YSy49.2 in3
Plastic Section Modulus about X-XZx307 in3
Plastic Section Modulus about Y-YZy75.6 in3
St. Venant Torsional ConstantJ8.98 in4
Warping Torsion ConstantCw32700 in6
Self Weight of sectionWeight122 lb/ft

Metric Units

DescriptionSymbolValue
Shape Category / DesignationTypeW
Section NameNameW21X122
Cross Sectional AreaA23161 mm2
Section Widthb315 mm
Section Depthd551 mm
Flange thicknesstf24.4 mm
Web thicknesstw15.2 mm
Radius of Gyration about X-Xrx231 mm
Radius of Gyrations about Y-Yry74 mm
Moment of Inertia about X-XIx1232000000 mm4
Moment of Intertia about Y-YIy127000000 mm4
Elastic Section Modulus about X-XSx4474000 mm3
Elastic Section Modulus about Y-YSy806000 mm3
Plastic Section Modulus about X-XZx5031000 mm3
Plastic Section Modulus about Y-YZy1239000 mm3
St. Venant Torsional ConstantJ3738000 mm4
Warping Torsion ConstantCw8781000000000 mm6
Self Weight of sectionWeight182 kg/m

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

A W21X122 steel section is a standard North American steel section in the W - Wide Flange category. It weighs 122 lb/ft and has a cross sectional area of 35.9 in2. The height and width of the section are 21.7 in and 12.4 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