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W40x278 Steel Beam Dimensions, Weight & Properties

The W40x278 wide flange beam is a structural steel section specified in the AISC 360-16 Specification for Structural Steel Buildings (2016 edition). This beam is commonly used in bridges, tall buildings, and heavy industrial projects where strength and structural reliability are critical. With its wide flange profile, the W40x278 delivers efficient load distribution and long-term durability, making it a preferred choice for engineers, architects, and fabricators. Accurate data ensures safe and precise design, fabrication, and erection. The table below highlights the key properties of this section, including depth, width, web and flange thickness, sectional area, and unit weight.

PropertyValue
Depth (h)1021.1 mm
Width (b)304.8 mm
Web Thickness (tw)26.2 mm
Flange Thickness (tf)46.0 mm
Root Fillet Radius (r)30.0 mm
Sectional Area (A)530.97 cm²
Unit Weight416.8 kg/m

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