This page provides a focused reference for the UB 686x254x152 universal beam, including its principal dimensions, sectional area, unit weight, cited standard, and accompanying DWG resource. It is intended to help drafters, designers, engineers, students, and other technical users identify the section and interpret the listed data.
The designation is a convenient section identifier, but it should not replace the detailed values shown in the source content. Use the stated depth, width, thicknesses, root fillet radius, sectional area, and unit weight when checking geometry or coordinating a drawing.
UB 686x254x152
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 : 687.5×254.5×13.2×21
Depth : 687.5 mm
Width : 254.5 mm
Web Thickness : 13.2 mm
Flange Thickness : 21 mm
Root Fillet Radius : 15 mm
Sectional Area : 194.1 cm2
Unit Weight : 152.4 kg/m
How to read the section information
A universal beam is an I-shaped hot-rolled section with two flanges connected by a web. The listed depth and width describe its overall envelope, while the web and flange thicknesses define the main plate-like elements of the rolled shape. The root fillet radius identifies the curved transition between the web and each flange.
The section designation is nominal. This is why designation figures should not automatically be treated as exact drawing dimensions. For drafting, clearance checks, connection layouts, and model verification, refer to the detailed dimensions preserved in the source block.
Sectional area and unit weight
Sectional area is a geometric property of the cross-section. It is useful in calculations involving material quantity, axial stress, and mass, but it is not a standalone statement of beam capacity.
Unit weight expresses the mass of the section per unit length. It can support quantity takeoffs and self-weight calculations, provided the user applies the unit system and load conventions required by the project. Do not confuse mass per length with a design load value.
What the standard reference means
The source identifies EN 10365:2017 as the dimensional reference for this section. That reference provides context for the product geometry and sectional data. It does not, by itself, establish suitability for a particular structure, connection, loading condition, or regulatory jurisdiction.
Structural selection also depends on factors such as steel grade, member length, restraint conditions, loading, stability, connection behavior, fabrication requirements, and the governing design rules. Those items are outside the dimensional identification provided on this page.
Using the DWG in a drafting workflow
The accompanying DWG can be used as a starting reference for CAD coordination. Before incorporating it into project documents, inspect the file and compare its geometry with the section information shown on this page.
- Confirm the drawing units and insertion scale.
- Check the section designation and principal dimensions.
- Review layers, line types, centerlines, and object organization.
- Do not rely on visual scaling when exact geometry is required.
- Coordinate connection plates, bolts, welds, copes, and clearances with the actual design details.
- Retain independent professional verification for project use.
Related reference topics
Useful supporting topics include universal beam terminology, I-shape geometry, web and flange dimensions, root fillets, sectional area, unit weight, section properties, steel connection detailing, and CAD quality-control procedures. Reviewing these concepts together helps distinguish basic section identification from structural design and fabrication detailing.
Frequently asked questions
What does UB 686x254x152 identify?
It identifies a universal beam section by its nominal designation. Use the detailed source values on this page when exact dimensions or unit weight are needed.
Why can the designation differ from the listed dimensions?
Rolled steel section names commonly use nominal identifying figures. Published dimensional data provides the more precise geometry used for technical reference and drawing checks.
Does sectional area indicate the beam’s load capacity?
No. Sectional area is one geometric property. Capacity requires additional properties and a design assessment covering material, loading, stability, restraint, member length, connections, and the applicable design rules.
What is the root fillet radius?
It is the curved transition where the web meets a flange. This feature matters when checking fit-up and clearance for plates, welds, bolts, stiffeners, and other connection components near the web-to-flange junction.
Can the DWG be inserted directly into a project drawing?
It should first be checked for units, scale, geometry, layers, and compatibility with the project CAD standards. Project-specific use also requires verification against the selected section and connection design.
