Hybox 355 CHS 88.9×3 is a circular hollow section identified by its outside diameter and wall thickness. The reference data below brings together the section dimensions, sectional area, unit weight, applicable dimensional standard, and the existing DWG resource.
This page is intended as a practical lookup for steel detailers, designers, engineers, students, and CAD users. The listed properties can support section identification, drawing coordination, material takeoff workflows, and comparison with other circular hollow sections, but project-specific selection and verification remain the responsibility of the qualified project team.
Hybox 355 CHS 88.9×3
Hybox 355 Circular 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.
Diameter : 88.9 mm
Thickness : 3 mm
Sectional Area : 8.1 cm2
Unit Weight : 6.4 kg/m
Section designation and reference data
In the designation CHS 88.9×3, CHS means circular hollow section. The listed diameter is 88.9 mm, while the wall thickness is 3 mm. Keeping these two values distinct is important when preparing details, checking fit-up, or comparing this section with other hollow-section sizes.
- Section family: Hybox 355 circular hollow section
- Diameter: 88.9 mm
- Wall thickness: 3 mm
- Sectional area: 8.1 cm2
- Unit weight: 6.4 kg/m
- Dimensional reference: EN 10219-2:2006-04
How the listed properties are used
Sectional area
Sectional area describes the amount of steel present in the cross-section. It is a section property rather than the open area enclosed by the tube. Designers use sectional area as an input when evaluating behavior associated with axial actions, while estimators and technical users may use it when checking section data across references.
Unit weight
The unit weight of 6.4 kg/m expresses the listed mass for each unit of member length. In a takeoff workflow, the section length and unit weight can be used together to estimate member mass. Such estimates should still account for the actual fabrication scope, including plates, fittings, connections, coatings, and other items not represented by the bare section value.
EN 10219-2 context
The source identifies EN 10219-2:2006-04 as the reference for tolerances, dimensions, and sectional properties of cold-formed welded structural hollow sections made from non-alloy and fine grain steels. It works alongside EN 10219-1, which addresses technical delivery conditions.
A dimensional standard does not by itself resolve every design, procurement, or fabrication requirement. Users should confirm the specified product, material documentation, tolerances, delivery conditions, connection design, and current project requirements before issuing drawings or orders.
Using the DWG in a detailing workflow
The existing download block provides the CAD resource associated with this section. Before incorporating the geometry into a production model or drawing, verify the CAD units, measured diameter, wall representation, insertion point, layer organization, and drawing scale. Also confirm whether the geometry is intended as a section outline, reference symbol, or fabrication-level representation.
A CAD profile is useful for layout and coordination, but it does not establish structural capacity, connection adequacy, availability, or compliance for a particular project. Related reference topics include CHS dimensions, hollow-section properties, section weight concepts, steel connection detailing, and CAD file checking.
Frequently asked questions
What does CHS mean in Hybox 355 CHS 88.9×3?
CHS means circular hollow section. The designation identifies a round structural hollow section rather than a solid round bar or an open structural shape.
What do 88.9 and 3 represent?
The listed diameter is 88.9 mm, and the listed wall thickness is 3 mm. These values should be checked independently when reviewing CAD geometry or coordinating connections.
What are the listed sectional area and unit weight?
The source data gives a sectional area of 8.1 cm2 and a unit weight of 6.4 kg/m.
Which standard is referenced for this section?
The page references EN 10219-2:2006-04 for dimensional tolerances, dimensions, and sectional properties. The source also notes that EN 10219-1 covers technical delivery conditions.
Can the DWG be used directly for fabrication?
The file can support drafting and coordination, but its geometry, units, layers, and intended level of detail should be verified before use. Fabrication and project drawings must also reflect the approved design, connection requirements, tolerances, and project specifications.
