EN 10266:2003
(Main)Steel tubes, fittings and structural hollow sections - Symbols and definitions of terms for use in product standards
Steel tubes, fittings and structural hollow sections - Symbols and definitions of terms for use in product standards
This European Standard gives the symbols and definitions of terms for use in product standards for steel tubes, fittings and steel structural hollow sections.
NOTE For definitions of terms non specific to tubular products, see other relevant standards e.g. EN ISO 9000 [1].
Stahlrohre, Fittings und Hohlprofile für den Stahlbau - Symbole und Definition von Begriffen für die Verwendung in Erzeugnisnormen
Diese Europäische Norm enthält die Definition von Begriffen und Symbolen für die Verwendung in Erzeugnisnormen für Stahlrohre, Fittings und Hohlprofile für den Stahlbau.
ANMERKUNG Zur Definition von Begriffen, die nicht speziell für rohrförmige Erzeugnisse gelten, siehe andere entsprechende Normen, z. B. EN ISO 9000 [1].
Tubes en acier, accessoires et profils creux en acier pour la construction - Symboles et définitions des termes à utiliser dans les normes de produits
La présente Norme européenne indique les symboles et définitions des termes en usage dans les normes de produits traitant des tubes, raccords et profils creux de construction en acier.
NOTE Pour les définitions des termes qui ne sont pas spécifiques aux produits tubulaires, voir d'autres normes appropriées, par exemple l'EN ISO 9000.
Steel tubes, fittings and structural hollow sections - Symbols and definitions of terms for use in product standards
General Information
- Status
- Published
- Publication Date
- 19-Aug-2003
- Withdrawal Date
- 28-Feb-2004
- Technical Committee
- ECISS/TC 110 - Steel tubes, and iron and steel fittings
- Drafting Committee
- ECISS/TC 29 - Steel tubes and fittings for steel tubes
- Current Stage
- 9093 - Decision to confirm - Review Enquiry
- Start Date
- 05-Jun-2025
- Completion Date
- 23-Sep-2025
Overview
EN 10266:2003 - Steel tubes, fittings and structural hollow sections: Symbols and definitions of terms for use in product standards (CEN) defines the standardized vocabulary and symbolic notation used in European product standards for steel tubes, tubular fittings and structural hollow sections. Prepared by CEN/TC 29 and derived from ISO 3545, the standard harmonizes terminology and symbols to ensure consistent specifications, drawings, test procedures and product standards across manufacturers, testing bodies and purchasers.
Key topics
- Definitions of core terms such as tube, structural hollow section, fitting, seamless tube (S), welded tube (W) and specific welded types (e.g. butt welded (BW), electric/high‑frequency welded (EW/HFW), submerged arc welded (SAW), combination welded (COW)).
- General symbols for geometric and dimensional parameters: outside/inside diameter (D, d), wall thickness (T), cross‑sectional area (Ac), mass per unit length (M), length types (standard, exact, approximate, random), and out‑of‑roundness (O = 100 × (Dmax − Dmin) / D).
- Additional symbols for structural hollow sections: corner radii, second moments of area (I), torsional and polar inertia (It), elastic/plastic section moduli (Wel, Wpl), radii of gyration and form‑related measures (twist, convexity/concavity, deviation from straightness).
- Testing symbols and methods referenced: pressure test, flattening, drift expanding, ring expanding, flanging and tube bending - with associated symbol designations used in product standards and test reports.
- Symbols for tubular fittings: dimensional notations for elbows, tees, reducers, caps (major/minor diameters, wall thickness on major/minor diameters, face‑to‑center distances, bending radius, tolerances on form).
Applications
- Creating or interpreting product standards, technical specifications and engineering drawings for steel tubes and fittings.
- Writing procurement documents and contracts that reference standardized terms and symbols to avoid ambiguity.
- Performing and documenting mechanical and dimensional tests in inspection reports and certificates.
- Ensuring consistent communication between manufacturers, fabricators, testing laboratories, structural engineers and conformity assessment bodies.
Who uses this standard
- Standards writers and technical committees
- Tube and fittings manufacturers and fabricators
- Structural and mechanical engineers
- Quality managers and inspection/testing laboratories
- Procurement professionals and regulators
Related standards
- EN ISO 9000 (quality management vocabulary): for definitions non‑specific to tubular products.
- ISO 3545: source standard from which EN 10266:2003 is derived.
Using EN 10266:2003 helps eliminate ambiguity in specifications for steel tubes, fittings and hollow sections by providing a common, CEN‑approved set of symbols and definitions for product standards.
Frequently Asked Questions
EN 10266:2003 is a standard published by the European Committee for Standardization (CEN). Its full title is "Steel tubes, fittings and structural hollow sections - Symbols and definitions of terms for use in product standards". This standard covers: This European Standard gives the symbols and definitions of terms for use in product standards for steel tubes, fittings and steel structural hollow sections. NOTE For definitions of terms non specific to tubular products, see other relevant standards e.g. EN ISO 9000 [1].
This European Standard gives the symbols and definitions of terms for use in product standards for steel tubes, fittings and steel structural hollow sections. NOTE For definitions of terms non specific to tubular products, see other relevant standards e.g. EN ISO 9000 [1].
EN 10266:2003 is classified under the following ICS (International Classification for Standards) categories: 01.040.77 - Metallurgy (Vocabularies); 01.075 - Character symbols; 77.140.75 - Steel pipes and tubes for specific use. The ICS classification helps identify the subject area and facilitates finding related standards.
EN 10266:2003 is associated with the following European legislation: EU Directives/Regulations: 97/23/EC; Standardization Mandates: M/071. When a standard is cited in the Official Journal of the European Union, products manufactured in conformity with it benefit from a presumption of conformity with the essential requirements of the corresponding EU directive or regulation.
EN 10266:2003 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Steel tubes, fittings and structural hollow sections - Symbols and definitions of terms for use in product standardsStahlrohre, Fittings und Hohlprofile für den Stahlbau - Symbole und Definition von Begriffen für die Verwendung in ErzeugnisnormenTubes en acier, accessoires et profils creux en acier pour la construction - Symboles et définitions des termes a utiliser dans les normes de produitsSteel tubes, fittings and structural hollow sections - Symbols and definitions of terms for use in product standards77.140.75Jeklene cevi in cevni profili za posebne nameneSteel pipes and tubes for specific use01.075Simboli za znakeCharacter symbols01.040.77Metalurgija (Slovarji)Metallurgy (Vocabularies)ICS:Ta slovenski standard je istoveten z:EN 10266:2003SIST EN 10266:2004en01-junij-2004SIST EN 10266:2004SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 10266August 2003ICS 01.040.77; 01.075; 77.140.75English versionSteel tubes, fittings and structural hollow sections - Symbols anddefinitions of terms for use in product standardsTubes en acier, accessoires et profils creux en acier pour laconstruction - Symboles et définitions des termes à utiliserdans les normes de produitsStahlrohre, Fittings und Hohlprofile für den Stahlbau -Symbole und Definition von Begriffen für die Verwendung inErzeugnisnormenThis European Standard was approved by CEN on 27 June 2003.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and UnitedKingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2003 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 10266:2003 ESIST EN 10266:2004
Afterwelding the tube may be further processed, either hot or cold, into its final dimensions2.6butt welded tube (BW)(also known as continuous weld tube or Fretz Moon tube) tube made by a continuous process in whichdecoiled strip, welded end to end, is passed through a furnace, formed into a hollow profile and theseam weld made by further raising of the temperature of the adjacent edges (e.g. using a jet of oxygen),and pressing the edges together2.7electric welded tube (EW)tube made by pressure welding, in a continuous or non continuous process, in which strip is formed coldinto a hollow profile and the seam weld made by heating the adjacent edges through the resistance tothe passage of high or low frequency current, and pressing the edges together.
The electric currentmay be applied either by direct electrode contact or by induction.2.8high frequency welded tube (HFW)tube made by pressure welding, in a continuous or non continuous process, in which strip is formed coldinto a hollow profile and the seam weld made by heating the adjacent edges through the resistance tothe passage of a high frequency current, and pressing the edges together.
The electric current may beapplied either by direct electrode contact or by induction.SIST EN 10266:2004
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