W21x44 is a rolled structural beam with wide flanges that is used in construction and other applications.
Table of Contents
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”