This reference page covers the Hybox 355 square hollow section identified as 250x250x6.3. Use the source data below when checking section geometry, mass, and drafting information for structural steel documentation.
For broader context, see related guidance on square hollow sections, sectional properties, steel terminology, and structural steel CAD/DWG references. The listed values remain the controlling local reference for this section.
Hybox 355 SHS 250x250x6.3
Hybox 355 Square Hollow Sections
refer to : EN 10219-2:2006-04
the European standard that specifies tolerances, dimensions, and sectional properties for cold-formed welded structural hollow sections made of non-alloy and fine grain steels. It complements EN 10219-1, which covers technical delivery conditions.
Dimension : 250x250x6.3
Depth : 250 mm
Width : 250 mm
Thickness : 6.3 mm
Outer Corner Radius : 15.8 mm
Inner Corner Radius : 9.4 mm
Sectional Area : 60 cm2
Unit Weight : 47.1 kg/m
How to read this SHS reference
The designation SHS means square hollow section. Its nominal depth and width describe the outside shape, while the listed thickness describes the wall dimension. The corner radii are important when modeling the profile accurately or coordinating connections, fittings, and fabrication details.
Section properties and mass
The sectional area is a geometric property used in engineering calculations and section comparisons. The unit weight expresses the listed mass per unit length, making it useful for material takeoffs, estimating, and load-path documentation. These values should be used together with the applicable design assumptions and project specifications rather than treated as a design conclusion by themselves.
Standard reference
The source identifies EN 10219-2:2006-04 for tolerances, dimensions, and sectional properties of cold-formed welded structural hollow sections. It also distinguishes this reference from EN 10219-1, which addresses technical delivery conditions. Always confirm that the project specification and procurement documentation require the same product designation and standard reference.
Drawing and detailing resource
The available DWG download can support drafting and coordination workflows. Before using the profile in fabrication or connection drawings, verify the corner geometry, wall thickness, orientation, units, and any project-specific detailing requirements.
Frequently asked questions
What does SHS mean?
SHS means square hollow section. It describes a hollow steel profile with a square outside form and specified wall thickness.
What do the dimensions in 250x250x6.3 represent?
The designation identifies the nominal outside depth, nominal outside width, and wall thickness listed for this Hybox 355 section. Refer to the source values for the complete dimensional reference, including corner radii.
Why are the corner radii listed?
Corner radii describe the curved transitions at the section corners. They help improve profile accuracy in CAD models and support coordination of connections, end details, and fabrication drawings.
What is the difference between sectional area and unit weight?
Sectional area is a geometric property of the steel cross-section. Unit weight describes the listed mass per unit length. Both are useful for different engineering, estimating, and documentation tasks.
Can the DWG be used directly for fabrication?
The DWG is a drafting reference, not a substitute for project-specific design review. Check units, geometry, tolerances, connection details, and fabrication requirements before issuing drawings.
