The Hybox 355 SHS 120x120x3 is a square hollow section reference for structural steel detailing, drafting, and preliminary section identification. This page brings together the published geometric data, sectional area, unit weight, applicable standard reference, and a downloadable DWG resource.
Use the technical block below as the controlling local reference for this section. For design work, confirm material designation, loading, connection details, fabrication requirements, and applicable project specifications with the responsible engineer.
Hybox 355 SHS 120x120x3
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 : 120x120x3
Depth : 120 mm
Width : 120 mm
Thickness : 3 mm
Outer Corner Radius : 6 mm
Inner Corner Radius : 3 mm
Sectional Area : 13.8 cm2
Unit Weight : 10.8 kg/m
How to read this SHS reference
SHS means square hollow section: a closed structural profile with equal outside dimensions in the two principal directions. The listed depth and width describe the outside envelope, while the thickness describes the wall. Corner radii are reported separately because the corners are formed rather than perfectly sharp; this affects how the section is represented in drawings, CAD models, and section-property calculations.
The source data also identifies the sectional area and unit weight. These values are useful for quantity takeoffs, member schedules, estimating, and checking whether a selected profile matches a project’s drafting or specification requirements. They should not be treated as a complete structural design check.
Standard and delivery context
The page references EN 10219-2 for dimensional and sectional-property information for cold-formed welded structural hollow sections. The source also distinguishes this from the related delivery-condition standard. When preparing a specification or reviewing supplier documentation, check the complete standard references and project requirements rather than relying on the profile designation alone.
CAD and drafting workflow
The downloadable DWG can support layout work, section callouts, fabrication drawings, and coordination models. Review the drawing units, layer conventions, insertion point, and representation of corner geometry before incorporating it into a project file. A CAD profile is a drafting resource; it does not replace verification of the supplied product or the design assumptions used by the engineer.
Related reference topics for internal linking include square hollow sections, structural steel section properties, steel member schedules, corner radii in hollow sections, and structural steel DWG details.
Frequently asked questions
What does SHS mean?
SHS stands for square hollow section. It describes a closed steel profile with a square outside form and a hollow interior.
What information is provided for this Hybox section?
The reference lists the section designation, overall dimensions, wall thickness, outer and inner corner radii, sectional area, unit weight, and the cited European standard reference.
What is EN 10219-2 used for in this reference?
It is identified as the source for dimensional, tolerance, and sectional-property information for cold-formed welded structural hollow sections. Always review the complete project specification and applicable delivery requirements.
Can the DWG be used directly for structural design?
The DWG is intended as a drafting and coordination aid. Structural design still requires verified material information, loads, restraint conditions, connection assumptions, and engineering review.
Why are corner radii listed separately?
Hollow sections have formed corners rather than idealized sharp corners. Recording the corner radii helps users interpret the section geometry and coordinate drawings or models more accurately.
