W21x44 is a rolled structural beam with wide flanges that is used in construction and other applications.
W21x44 Beam Size and Dimensions
The dimensions and specifications of this structural steel beam are below:
|Web Thickness||0.35 in|
|Flange Thickness||0.45 in|
|Area Moment of Inertia||826 in4|
|Elastic Section Modulus||80 in3|
The depth of W21x44 beams may vary by 1/8” above and below the nominal value.
The flange width may vary by 1/4” above nominal and 3/16” below nominal. The flanges may be out of square by as much as 5/16”.
The distance from the center of the web to the center of the profile may be no greater than 3/16”.
The radii of fillets and toes for W-beams are not specified. Instead, these dimensions are left up to individual manufacturers.
Wide flange beams are designated by their depth x weight. The W21x44 designation indicates that the beam weighs 44 pounds per foot. A 10-foot section of W21x44 would weigh 440 pounds and a 50-foot section of W21x44 would weigh 2,200 pounds.
W21x44 Conversion to Metric
The metric equivalent to W21x44 is W530x66. This metric beam has the following specifications:
|Web Thickness||8.9 mm|
|Flange Thickness||11.4 mm|
W21x44 Section Properties
W21x44 Area Moment of Inertia
The area moment of inertia (or second moment area) for a W21x44 beam about the x-axis (perpendicular to the flange) can be calculated from the equation below:
The area moment of inertia of the W21x44 profile about the x-axis is approximately 826 in4.
The elastic section modulus for a W21x44 beam about the X-axis is calculated from the following equation:
The elastic section modulus for the W21x44 profile about the X-axis is approximately 80 in3.
The properties of W21x44 channel are specified by ASTM A6 “Standard Specifications for Rolled Structural Steel Bars, Plates, Shapes and Sheet Piling”