Hybox 355 SHS 300x300x12 is a cold-formed welded square hollow section reference for structural steel detailing and engineering review. This page brings together the section dimensions, corner geometry, sectional area, unit weight, applicable standard reference, and a downloadable DWG resource.
Use the source values below when checking a model, preparing fabrication drawings, or comparing this section with other square hollow sections. Section selection and connection design should be verified against the governing project requirements by a qualified engineer.
Hybox 355 SHS 300x300x12.0
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 : 300x300x12
Depth : 300 mm
Width : 300 mm
Thickness : 12 mm
Outer Corner Radius : 36 mm
Inner Corner Radius : 24 mm
Sectional Area : 132 cm2
Unit Weight : 103.6 kg/m
How to read the Hybox 355 SHS reference
The designation 300x300x12 identifies a square hollow section with equal outside depth and width and a stated wall thickness. The listed outer and inner corner radii describe the curved transitions between the flat faces of the tube. These details matter when reviewing clearances, connected plates, weld locations, and the geometry represented in a CAD model.
The listed sectional area is a cross-sectional property used in member calculations, while the unit weight supports material takeoff and mass estimates. These values should be used together with the complete design basis, including the member actions, restraint conditions, connection arrangement, fabrication requirements, and applicable design rules.
Standard and delivery context
The source content 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 the companion reference for technical delivery conditions. Confirm the project specification and required material documentation before procurement or fabrication.
CAD and drafting workflow
The downloadable DWG can support preliminary drafting, layout coordination, and section-library development. Before using it for fabrication, check the drawing units, layer structure, insertion point, profile orientation, and whether the corner representation matches the intended engineering reference. For related research, compare this page with other SHS dimensions, hollow section properties, and steel connection detailing references on SteelSTD.
Frequently asked questions
What does Hybox 355 SHS 300x300x12 mean?
It identifies a Hybox 355 square hollow section with a depth of 300 mm, a width of 300 mm, and a thickness of 12 mm.
Which standard is referenced for this section?
The source references EN 10219-2:2006-04 for dimensions, tolerances, and sectional properties, alongside EN 10219-1 for technical delivery conditions.
What corner geometry is listed?
The reference lists an outer corner radius of 36 mm and an inner corner radius of 24 mm. These values help users review the profile shape in detailing and CAD work.
Where can I obtain the CAD file?
A DWG download is provided with the source content. Review its units and geometry before incorporating it into a project drawing or section library.
Can the listed properties be used directly for structural design?
The listed properties are reference data for this section. Final design use requires verification against the governing design standard, loading, restraints, connections, material documentation, and project specifications.
