This reference page covers the Hybox 355 square hollow section identified as 400x400x12. It brings the key dimensional and sectional data together with the stated EN 10219-2 reference and a DWG download for drafting workflows.
Use the source values below when checking a drawing, preparing a material schedule, or comparing hollow section references. For design work, confirm the applicable material documentation, connection details, loading assumptions, and project requirements with the responsible engineer.
Hybox 355 SHS 400x400x12.0
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 : 400x400x12
Depth : 400 mm
Width : 400 mm
Thickness : 12 mm
Outer Corner Radius : 36 mm
Inner Corner Radius : 24 mm
Sectional Area : 180 cm2
Unit Weight : 141.3 kg/m
How to read the Hybox 355 SHS data
The designation 400x400x12 identifies a square hollow section with a 400 mm depth, a 400 mm width, and a 12 mm wall thickness. Because the section is square, the listed outside dimensions are equal; the corner geometry is reported separately through the outer and inner corner radii.
Section geometry and mass
The listed sectional area is useful when reviewing section-property references and material takeoffs. The unit weight expresses the mass per metre and can support quantity checks, handling discussions, and weight-based estimating. These values should be read together with the dimensional data rather than treated as substitutes for the full section reference.
Standard reference
The page cites EN 10219-2:2006-04 for dimensions, tolerances, and sectional properties of cold-formed welded structural hollow sections. It also identifies EN 10219-1 as the related reference for technical delivery conditions. Keep these dimensional and delivery-condition references distinct when reviewing specifications or mill documentation.
CAD and detailing workflow
The linked DWG file can help with preliminary drafting, layout, and section-library coordination. Before issuing fabrication or construction documents, check the downloaded geometry against the project specification and the authoritative source data. Related topics such as square hollow sections, steel section properties, structural steel connections, and DWG reference files provide useful next reading for detailing and design review.
Reference data at a glance
- Section type: Hybox 355 square hollow section
- Nominal designation: 400x400x12
- Corner geometry: outer and inner corner radii are listed in the source data
- Section properties: sectional area and unit weight are provided in the source data
- Reference standard: EN 10219-2:2006-04, with EN 10219-1 identified for technical delivery conditions
Frequently asked questions
What does SHS mean?
SHS means square hollow section. It describes a closed steel profile with square outside dimensions and a hollow interior.
What do the three values in 400x400x12 represent?
They identify the section depth, section width, and wall thickness, respectively, as listed in the source data.
Why are the corner radii listed separately?
Corner radii describe the rounded transitions at the section corners. They are part of the profile geometry and help distinguish the actual section shape from a sharp-corner approximation.
What does EN 10219-2 refer to on this page?
It is the cited European standard reference for dimensions, tolerances, and sectional properties of cold-formed welded structural hollow sections. The page separately identifies EN 10219-1 for technical delivery conditions.
Can the DWG be used directly for fabrication?
The DWG is a reference resource for drafting and coordination. Verify its geometry, project requirements, material documentation, and detailing assumptions before using it in issued fabrication or construction drawings.
