TS EN 10266

TS EN 10266 is a terminology standard that defines the symbols and terms used in product standards for steel tubes, fittings and structural hollow sections. It provides a common language for this product family, helping technical documents, purchasing specifications and product standards use consistent meanings when referring to tubular steel products.

The standard is concerned with terminology rather than with manufacturing rules for the products themselves. In general technical terms, tubes are tubular components used to carry fluids or gases or to form structural elements; fittings are parts that connect, redirect or adapt piping runs; and structural hollow sections are hollow steel sections primarily intended for load-bearing applications. Distinguishing these categories matters because product standards often rely on precise names to describe geometry, intended use and related characteristics.

Why a shared vocabulary matters in tubular steel standards

A terminology standard helps align symbols, definitions and abbreviations across the standards that govern steel tubes and hollow sections. That consistency supports design work, manufacturing communication, inspection and commercial documentation, reducing ambiguity when different standards refer to shape, section type, dimensions or application. For the steel tube sector, a shared vocabulary is especially useful because similar-looking products may serve very different functions in piping systems and structural work.

This edition of TS EN 10266 is based on EN 10266:2003 and reflects the established terminology used in the field. As a general reference document, it supports the reading and interpretation of other product standards by keeping the underlying terms and symbols aligned.

• Supports common terminology for steel tubes and metal tubes.
• Brings fittings and pipework-related terms into one coordinated framework.
• Helps distinguish structural hollow sections from other tubular products.
• Promotes consistent use of symbols and definitions in product standards.