The Hybox 355 SHS 350x350x12.5 is a square hollow structural section reference for checking section dimensions, corner geometry, sectional area, and unit weight. This page also identifies the relevant European standard context and provides a DWG file for drafting workflows.
Use the dimensional data below when coordinating structural drawings, section schedules, connection details, and preliminary design information. Final member selection and connection design should be verified against the governing project requirements and the applicable design rules.
Hybox 355 SHS 350x350x12.5
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 : 350x350x12.5
Depth : 350 mm
Width : 350 mm
Thickness : 12.5 mm
Outer Corner Radius : 37.5 mm
Inner Corner Radius : 25 mm
Sectional Area : 162 cm2
Unit Weight : 127.2 kg/m
How to read this SHS reference
SHS means square hollow section. The designation 350x350x12.5 describes the nominal outside depth, nominal outside width, and wall thickness shown in the source data. Because the section is square, its listed outside depth and width are the same.
Corner geometry
The outer and inner corner radii describe the rounded transitions between the flat faces of the section. These dimensions matter when checking clearances, modeling the profile in CAD, detailing connections, or comparing a simplified section model with the manufactured profile.
Section properties and handling data
The sectional area is useful for section-property checks and material takeoff, while the unit weight supports estimating linear steel weight. These values should be read together with the dimensional data rather than treated as substitutes for a complete structural design check.
Standard and CAD reference
The source identifies EN 10219-2:2006-04 for dimensional tolerances, dimensions, and sectional properties for cold-formed welded structural hollow sections. It also distinguishes this reference from EN 10219-1, which addresses technical delivery conditions. The linked DWG resource can support drafting, layout, and coordination work; verify the downloaded geometry against the project model before issuing drawings.
Related engineering references
For broader study, connect this page with references covering square hollow sections, rectangular hollow sections, steel section properties, corner radii, EN 10219, and structural steel CAD blocks.
Frequently asked questions
What does SHS mean?
SHS means square hollow section. It is a hollow structural steel profile with square outside dimensions and rounded corners.
What does 350x350x12.5 mean?
For this reference, the designation identifies the nominal outside depth, nominal outside width, and wall thickness listed in the source data.
Why are both outer and inner corner radii listed?
The two radii describe the external and internal curvature at the section corners. They are useful for accurate CAD modeling, detailing, and section-geometry checks.
Which standard is referenced?
The page references EN 10219-2:2006-04 for relevant dimensions, tolerances, and sectional properties. The source also notes the relationship to EN 10219-1 for technical delivery conditions.
Is a DWG file available?
Yes. The page includes a DWG download associated with the Hybox 355 SHS 350x350x12.5 profile. Review the file before using it in issued construction or fabrication documentation.
Can the listed unit weight be used for a final design?
The listed unit weight is reference data for estimating and coordination. Final design decisions require project-specific verification by a qualified engineer using the applicable design requirements.
