This reference page identifies the Celsius 355 rectangular hollow section (RHS) with a 400x300x11 designation. It brings together the source dimensions, corner radii, sectional area, unit weight, applicable standard reference, and a downloadable DWG file for drafting workflows.
Use the dimensional data as a reference when reviewing RHS steel sections, comparing rectangular hollow section options, or coordinating structural steel drawings. Design decisions should be checked against the project specification and verified by the responsible engineer.
Celsius 355 RHS 400x300x11
Celsius 355 Rectangular Hollow Sections
refer to : EN 10210-2:2006-04
the European standard that specifies tolerances, dimensions, and sectional properties for hot-finished structural hollow sections of non-alloy and fine grain steels. It supports EN 10210-1, which covers technical delivery conditions.
Dimension : 400x300x11
Depth : 400 mm
Width : 300 mm
Thickness : 11 mm
Outer Corner Radius : 16.5 mm
Inner Corner Radius : 11 mm
Sectional Area : 148 cm2
Unit Weight : 116.2 kg/m
Understanding the Celsius 355 RHS designation
RHS describes a rectangular hollow section. In the designation 400x300x11, the first two values identify the listed outside depth and width, while the final value identifies the wall thickness. The source data gives a depth of 400 mm, a width of 300 mm, and a thickness of 11 mm.
Section data and corner geometry
The page records an outer corner radius of 16.5 mm and an inner corner radius of 11 mm. These radii are important when coordinating connection details, clearances, fabrication drawings, and CAD geometry because an RHS corner is not represented by a perfectly sharp external corner.
The listed sectional area is 148 cm2, and the listed unit weight is 116.2 kg/m. These values can support preliminary quantity checks and section comparisons, but they should not be treated as a substitute for a complete structural design review.
Standard reference and CAD resource
The source refers to EN 10210-2:2006-04 for dimensions, tolerances, and sectional properties of hot-finished structural hollow sections, with EN 10210-1 identified as covering technical delivery conditions. Review the applicable project requirements before relying on any standard reference for procurement or design.
The linked DWG resource can help with drafting and model coordination. Check the downloaded geometry against the authoritative dimensional data before issuing fabrication or construction documents. Related references may include RHS section properties, steel shape terminology, structural steel connections, and CAD/DWG section resources.
Frequently asked questions
What is the size of the Celsius 355 RHS?
The listed designation is 400x300x11. The source identifies the depth as 400 mm, the width as 300 mm, and the thickness as 11 mm.
What are the listed corner radii?
The listed outer corner radius is 16.5 mm, and the listed inner corner radius is 11 mm.
What is the sectional area?
The listed sectional area is 148 cm2.
What is the unit weight?
The listed unit weight is 116.2 kg/m.
Which standard is referenced?
The source refers to EN 10210-2:2006-04 for dimensions, tolerances, and sectional properties, and identifies EN 10210-1 as covering technical delivery conditions.
Is a CAD file available?
Yes. The page includes a DWG download for the Celsius 355 RHS 400x300x11 section. Verify the file against the listed source dimensions before using it in issued drawings.
