The UB 406x178x85 is a Universal Beam reference entry for engineers, detailers, fabricators, and students working with European structural steel sections. This page brings together the listed dimensional data, section properties, standard reference, and a CAD download in one place.
Use the information below alongside project drawings, material specifications, connection details, and the applicable design checks. For related guidance, see our references on Universal Beam dimensions, steel section properties, and structural steel terminology.
UB 406x178x85
Universal Beams
refer to : EN 10365:2017
a European standard that defines the dimensions, tolerances, and sectional properties for hot-rolled steel channels, I-beams, and H-beams used in construction and engineering. It ensures uniformity and compatibility across European structural steel products.
Dimension : 417x181x10.9×18.2
Depth : 417 mm
Width : 181 mm
Web Thickness : 10.9 mm
Flange Thickness : 18.2 mm
Root Fillet Radius : 10 mm
Sectional Area : 108.2 cm2
Unit Weight : 84.9 kg/m
How to read the UB 406x178x85 designation
The designation identifies a Universal Beam size and its nominal mass class. The listed dimensions provide the actual reference values for overall depth, flange width, web thickness, and flange thickness. These details are more useful for drafting and coordination than relying on the designation alone.
Dimensions and section properties
The source entry gives a depth of 417 mm, a width of 181 mm, a web thickness of 10.9 mm, and a flange thickness of 18.2 mm. It also lists a 10 mm root fillet radius, a sectional area of 108.2 cm2, and a unit weight of 84.9 kg/m.
The root fillet is the curved transition between the web and flange. It affects detailing clearances, connection fit-up, coping, and the way the section is represented in fabrication drawings. Sectional area and unit weight are useful for quantity estimates and coordination, but structural capacity and connection adequacy require a complete engineering assessment.
Standard and CAD reference
This entry refers to EN 10365:2017, which provides a common framework for dimensions, tolerances, and sectional properties of listed hot-rolled steel sections. Always coordinate the selected section with the project specification and procurement documentation.
The linked DWG file can support preliminary drafting and layout work. Check the drawing against the authoritative project information before fabrication, and review related resources on steel connections, detailing clearances, and structural steel CAD blocks.
Frequently asked questions
What is the UB 406x178x85?
It is a Universal Beam reference with the listed dimensions and properties for this section entry. The page identifies it by the designation UB 406x178x85 and references EN 10365:2017.
What are the listed dimensions of this beam?
The listed dimensions are 417 mm depth, 181 mm width, 10.9 mm web thickness, and 18.2 mm flange thickness. The listed root fillet radius is 10 mm.
What are the section area and unit weight?
The source lists a sectional area of 108.2 cm2 and a unit weight of 84.9 kg/m. These values can assist with material takeoffs and coordination.
Is a DWG file available?
Yes. The entry includes a DWG download for the UB 406x178x85. Review the CAD geometry against project drawings and fabrication requirements before using it for final work.
Does this page provide a design capacity?
No. The listed dimensions and section properties do not by themselves establish bending, shear, compression, buckling, fire, connection, or serviceability performance. Those checks must be completed for the specific project conditions.
