This page provides a concise dimensional and CAD reference for the Hybox 355 CHS 457×8 circular hollow section. The source data identifies the section by its listed diameter and thickness and includes its sectional area, unit weight, and relevant dimensional standard.
Use the verified values below when identifying the section, preparing preliminary material schedules, or checking a CAD-based detailing workflow. The designation and listed properties identify the section, but they do not by themselves establish structural capacity or suitability for a particular project.
Hybox 355 CHS 457×8
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 : 457 mm
Thickness : 8 mm
Sectional Area : 113 cm2
Unit Weight : 88.7 kg/m
Understanding the CHS reference
CHS means circular hollow section. Its closed, circular form provides the same geometric profile about every radial direction, which can be useful when orientation-independent geometry is important. The section designation should still be checked against the listed dimensional and property data rather than interpreted without reference to the source information.
How to read the listed properties
- Diameter: The listed circular section dimension used to identify and coordinate the profile.
- Thickness: The listed wall dimension for the hollow section.
- Sectional area: The cross-sectional area of steel, not the enclosed hollow area or exterior surface area.
- Unit weight: The mass per unit length, useful for material schedules, quantity takeoffs, and handling assessments when combined with the actual member length.
Standard context
The source refers to EN 10219-2:2006-04 for tolerances, dimensions, and sectional properties of cold-formed welded structural hollow sections. It also notes that EN 10219-1 addresses technical delivery conditions. For project work, confirm which standards, product documentation, tolerances, and procurement requirements apply before issuing drawings or fabrication information.
Using the CAD resource
The DWG resource can support section identification, drafting, and reference workflows. After opening the file, verify drawing units, object scale, layer organization, linework, and the section designation before inserting it into a project drawing. Do not assume that CAD geometry alone includes connection design, fabrication tolerances, material requirements, or structural capacity checks.
Related reference topics
This section is closely related to circular hollow section dimensions, hollow-section property definitions, steel unit-weight concepts, EN 10219 dimensional references, and CAD detailing practices. Those topics help distinguish geometric reference data from the separate engineering checks required for member design and connections.
Frequently asked questions
What does CHS mean in this designation?
CHS means circular hollow section, a closed steel section with a circular profile and hollow interior.
Is sectional area the same as the area inside the tube?
No. Sectional area refers to the cross-sectional area occupied by the steel. It is different from the open area enclosed by the wall.
Can unit weight be used for a material takeoff?
Yes. Unit weight can be combined with the required member lengths to support quantity and mass calculations. Cutting allowances, connection material, coatings, and other project-specific items require separate consideration.
Does the DWG file confirm structural capacity?
No. A DWG file is a drafting resource. Structural capacity depends on the applicable design method, verified material and section data, member conditions, connections, loading, and project requirements.
What should be checked before using the section in a drawing?
Confirm the designation, listed dimensions, drawing units, scale, geometry, applicable standard, and project requirements. A qualified professional should verify final design and detailing decisions.
