Hybox 355 SHS 350x350x12 is a square hollow section reference for engineers, detailers, fabricators, and students working with structural steel. This page brings the listed dimensions, corner radii, sectional area, and unit weight together with the cited European standard reference.
Use the dimensional information for section identification and detailing coordination, then consult the applicable project requirements and engineering checks before using the section in a design. A DWG download is also provided for CAD and drafting workflows.
Hybox 355 SHS 350x350x12.0
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 : 350x350x12
Depth : 350 mm
Width : 350 mm
Thickness : 12 mm
Outer Corner Radius : 36 mm
Inner Corner Radius : 24 mm
Sectional Area : 156 cm2
Unit Weight : 122.5 kg/m
How to read the Hybox 355 SHS designation
The designation 350x350x12 identifies a square hollow section with equal outside depth and width and a stated wall thickness. The source listing gives a depth of 350 mm, a width of 350 mm, and a thickness of 12 mm.
Because the section is hollow and has formed corners, its corner radii are listed separately from the nominal flat dimensions. The page identifies both the outer and inner corner radii, which can be useful when coordinating accurate profile geometry in drawings or CAD models.
Section properties and reference data
The listing reports a sectional area of 156 cm2 and a unit weight of 122.5 kg/m. These values provide a concise reference for material takeoff, schedule preparation, and comparison with other square hollow sections. They should not be treated as a substitute for project-specific checks, connection design, fabrication requirements, or applicable specifications.
Standard reference and CAD resource
The source refers to EN 10219-2:2006-04 for tolerances, dimensions, and sectional properties of cold-formed welded structural hollow sections made from non-alloy and fine grain steels. It also identifies EN 10219-1 as covering technical delivery conditions. For related guidance, link this page to the site’s references on square hollow sections, steel section properties, steel terminology, and CAD/DWG resources.
The attached DWG can support drafting and layout work. Verify units, drawing conventions, and the required level of geometric detail before incorporating downloaded geometry into a project file.
Frequently asked questions
What does Hybox 355 SHS 350x350x12 mean?
It identifies a Hybox 355 square hollow section with a listed depth of 350 mm, width of 350 mm, and wall thickness of 12 mm.
What corner radii are listed for this section?
The source lists an outer corner radius of 36 mm and an inner corner radius of 24 mm.
What sectional area and unit weight are provided?
The listed sectional area is 156 cm2, and the listed unit weight is 122.5 kg/m.
Which standard is referenced?
The page refers to EN 10219-2:2006-04 for tolerances, dimensions, and sectional properties, and notes that EN 10219-1 covers technical delivery conditions.
Is a CAD file available?
Yes. The page includes a DWG download associated with the Hybox 355 SHS 350x350x12 section. Check the file and drawing settings before using it in project documentation.
