Dimensions and section properties for W21X55

Structural sectional properties for a W21X55 standard steel section

steel section diagram

US Customary Units

DescriptionSymbolValue
Shape Category / DesignationTypeW
Section NameNameW21X55
Cross Sectional AreaA16.2 in2
Section Widthb8.22 in
Section Depthd20.8 in
Flange thicknesstf0.522 in
Web thicknesstw0.375 in
Radius of Gyration about X-Xrx8.4 in
Radius of Gyrations about Y-Yry1.73 in
Moment of Inertia about X-XIx1140 in4
Moment of Intertia about Y-YIy48.4 in4
Elastic Section Modulus about X-XSx110 in3
Elastic Section Modulus about Y-YSy11.8 in3
Plastic Section Modulus about X-XZx126 in3
Plastic Section Modulus about Y-YZy18.4 in3
St. Venant Torsional ConstantJ1.24 in4
Warping Torsion ConstantCw4980 in6
Self Weight of sectionWeight55 lb/ft

Metric Units

DescriptionSymbolValue
Shape Category / DesignationTypeW
Section NameNameW21X55
Cross Sectional AreaA10452 mm2
Section Widthb209 mm
Section Depthd528 mm
Flange thicknesstf13.3 mm
Web thicknesstw9.5 mm
Radius of Gyration about X-Xrx213 mm
Radius of Gyrations about Y-Yry44 mm
Moment of Inertia about X-XIx475000000 mm4
Moment of Intertia about Y-YIy20000000 mm4
Elastic Section Modulus about X-XSx1803000 mm3
Elastic Section Modulus about Y-YSy193000 mm3
Plastic Section Modulus about X-XZx2065000 mm3
Plastic Section Modulus about Y-YZy302000 mm3
St. Venant Torsional ConstantJ516000 mm4
Warping Torsion ConstantCw1337000000000 mm6
Self Weight of sectionWeight82 kg/m

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

A W21X55 steel section is a standard North American steel section in the W - Wide Flange category. It weighs 55 lb/ft and has a cross sectional area of 16.2 in2. The height and width of the section are 20.8 in and 8.22 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