This page provides a focused reference for the Hybox 355 square hollow section identified as 70x70x3.0. It brings together the listed geometry, corner radii, sectional area, unit weight, governing standard reference, and CAD download.
Use this entry alongside the site’s guides to square hollow sections (SHS), steel section terminology, section properties, and connection detailing. The source values below remain the controlling local reference for this profile.
Profile at a glance
- Section type: Hybox 355 square hollow section
- Listed size: 70x70x3.0
- Standard reference: EN 10219-2:2006-04
- CAD resource: DWG download provided with the original entry
Hybox 355 SHS 70x70x3.0
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 : 70x70x3
Depth : 70 mm
Width : 70 mm
Thickness : 3 mm
Outer Corner Radius : 6 mm
Inner Corner Radius : 3 mm
Sectional Area : 7.81 cm2
Unit Weight : 6.1 kg/m
How to read this SHS reference
SHS means square hollow section: a hollow steel profile with equal listed depth and width. In this entry, the dimension callout identifies the section depth, width, and wall thickness. The corner-radius values describe the curved transitions between the flat faces and are part of the section geometry.
Standard context
The entry refers to EN 10219-2:2006-04, which addresses dimensions, tolerances, and sectional properties for cold-formed welded structural hollow sections made from non-alloy and fine grain steels. The source also notes that EN 10219-2 complements EN 10219-1, which covers technical delivery conditions.
Sectional area and unit weight
Sectional area and unit weight are different reference values. Sectional area describes the steel area through a cross-section, while unit weight expresses the listed mass per unit length. Both values are useful when checking section schedules, estimating material quantities, or coordinating design and drafting information, but they should not be treated as a substitute for project-specific engineering verification.
Using the DWG resource
The attached DWG is a practical starting point for drafting and layout work. Before issuing drawings, compare the CAD geometry with the authoritative dimensions in this entry and confirm that the selected section, material requirements, tolerances, and connection details match the project specification. See related site resources on CAD/DWG steel references and SHS detailing for complementary drafting guidance.
Frequently asked questions
What does Hybox 355 SHS 70x70x3 mean?
It identifies a Hybox 355 square hollow section with the listed 70x70x3.0 dimensional designation. The source also provides its corner radii, sectional area, and unit weight.
Which standard is referenced for this section?
The entry references EN 10219-2:2006-04 and explains that it covers dimensions, tolerances, and sectional properties for cold-formed welded structural hollow sections. It complements EN 10219-1, which covers technical delivery conditions.
Why are the outer and inner corner radii listed?
Corner radii define the curved portions of the SHS profile and help distinguish the actual section geometry from a simplified sharp-corner sketch. They should be retained when coordinating detailed drawings or section-property information.
What is the difference between sectional area and unit weight?
Sectional area describes the cross-sectional steel area. Unit weight describes the mass associated with a unit length of the section. They serve different purposes in engineering references and material takeoffs.
Can the DWG be used directly for structural design?
The DWG is a drafting reference, not a replacement for design checks. Verify the geometry, material requirements, tolerances, connections, and applicable project criteria before using it in issued design documentation.
