The Hybox 355 SHS 400x400x6.3 is a square hollow section reference entry for structural steel detailing and preliminary section comparison. This page presents the source dimensions and section data without replacing the authoritative local values.
Use the reference information alongside related resources on SHS terminology, sectional properties, steel connections, and CAD/DWG downloads. Final member selection and connection design require verification against the applicable project requirements and engineering design method.
Hybox 355 SHS 400x400x6.3
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 : 400x400x6.3
Depth : 400 mm
Width : 400 mm
Thickness : 6.3 mm
Outer Corner Radius : 15.8 mm
Inner Corner Radius : 9.4 mm
Sectional Area : 97.8 cm2
Unit Weight : 76.8 kg/m
How to read the Hybox 355 SHS designation
SHS means square hollow section: the outside depth and width are equal, producing a closed rectangular steel profile. In this entry, the designation identifies a 400×400 section with a 6.3 mm wall thickness.
Reference dimensions and section data
The listed depth and width describe the outside envelope of the section, while thickness describes the nominal wall. The outer and inner corner radii are important when preparing accurate details, checking clearances, or representing the profile in CAD.
Sectional area is used with other verified material and design data when evaluating member resistance, stiffness, or self-weight. The listed unit weight describes the mass of the section per metre and can support quantity takeoffs and coordination tasks. These values should not be treated as a complete structural design check.
Standard and CAD reference
The source identifies EN 10219-2:2006-04 for dimensional, tolerance, and sectional-property reference information for cold-formed welded structural hollow sections. It also identifies EN 10219-1 as covering technical delivery conditions. Consult the supplied DWG resource when developing drawings, and confirm that the selected geometry and project specification match the intended application.
Frequently asked questions
What type of section is Hybox 355 SHS 400x400x6.3?
It is a square hollow section, with equal outside depth and width and a specified wall thickness.
Why are the corner radii included?
Corner radii describe the transition between the flat faces of the hollow section. They help support accurate CAD representation, detailing, and clearance checks.
What does sectional area indicate?
Sectional area is a geometric property of the steel profile. It is used with verified material and design information for engineering checks, but it does not by itself establish member capacity.
Is a DWG file available?
Yes. The source content provides a DWG download for the Hybox 355 SHS 400x400x6.3 profile.
