EN 3851:2003
(Main)Aerospace series - Pipe couplings, 60°, spherical, in titanium alloy TI-P64001 - Swivel nuts, straight
Aerospace series - Pipe couplings, 60°, spherical, in titanium alloy TI-P64001 - Swivel nuts, straight
This standard specifies the characteristics of straight swivel nuts for pipe couplings, 60°, spherical, in TI-P64001, for aerospace applications.
NOTE Assembly in accordance with TR 4052.
Luft- und Raumfahrt - Rohrverschraubungen 60° mit Kugelbuchse, aus Titanlegierung TI-P64001 - Gerade Überwurfmuttern
Diese Norm legt die Eigenschaften von geraden Überwurfmuttern für Rohrverschraubungen 60° mit Kugelbuchse aus TI P64001 für Anwendungen in der Luft- und Raumfahrt fest.
ANMERKUNG Montage nach TR 4052
Série aérospatiale - Raccords sphériques, 60°, en alliage de titane TI-P64001 - Ecrous prisonniers, droits
Aerospace series - Pipe couplings, 60°, spherical, in titanium alloy TI-P64001 - Swivel nuts, straight
General Information
Overview
EN 3851:2003 is a European aerospace standard that specifies the characteristics of straight swivel nuts for 60° spherical pipe couplings manufactured in titanium alloy TI‑P64001. Intended for aerospace fluid systems and components, the standard defines geometry, material, surface treatment references and marking/quality requirements for these components.
Note: assembly should follow TR 4052.
Key topics and technical requirements
- Scope and configuration
- Defines the configuration, dimensions, tolerances and masses (values given in millimetres and apply before lubrication).
- Includes a diameter code system and example designations for identification.
- Material
- Component material specified as titanium alloy TI‑P64001 (referenced via EN 2530 for related titanium alloy specifications).
- Threads and splines
- Thread limits and fittings conform to ISO 5855‑3 (MJ threads).
- Splines are specified in accordance with ISO 4156.
- Tolerances
- General tolerance grades and limit deviations referenced to ISO 286‑2.
- Surface coating
- Coating and dry-lubricant recommendations reference EN 2491 (molybdenum disulfide dry lubricants / coating methods).
- Marking and designation
- Marking rules follow EN 2424 (aerospace marking style A) and the standard provides an example designation scheme (standard number + diameter code).
- Quality assurance
- Quality system and approval follow EN 2000 (approval of manufacturers’ quality systems).
- Normative references
- The standard incorporates several normative references which govern dimensional, material, coating and quality practices used with these swivel nuts.
Applications and who uses EN 3851:2003
- Primary application: design, manufacture, procurement and inspection of swivel nuts used in 60° spherical pipe couplings within aerospace fluid systems (fuel, hydraulic and pneumatic lines where titanium fittings are required).
- Typical users:
- Aerospace OEMs and tier‑1 suppliers specifying couplings and fittings.
- Component manufacturers producing titanium swivel nuts to standardized dimensions and tolerances.
- Quality, inspection and procurement teams ensuring conformity of fittings.
- Certification bodies and maintenance organizations verifying marking, material and coating per aerospace requirements.
Related standards
- EN 2530 (titanium alloy TI‑P63 / related titanium specs)
- EN 2491 (molybdenum disulphide dry lubricants)
- ISO 5855‑3 (MJ thread limits)
- ISO 4156 (splines)
- ISO 286‑2 (tolerances)
- EN 2424 (marking)
- EN 2000 (quality assurance)
- TR 4052 (assembly recommendations)
Keywords: EN 3851:2003, aerospace standard, swivel nuts, 60° spherical pipe couplings, titanium TI‑P64001, MJ threads, ISO 5855‑3, surface coating, quality assurance.
Frequently Asked Questions
EN 3851:2003 is a standard published by the European Committee for Standardization (CEN). Its full title is "Aerospace series - Pipe couplings, 60°, spherical, in titanium alloy TI-P64001 - Swivel nuts, straight". This standard covers: This standard specifies the characteristics of straight swivel nuts for pipe couplings, 60°, spherical, in TI-P64001, for aerospace applications. NOTE Assembly in accordance with TR 4052.
This standard specifies the characteristics of straight swivel nuts for pipe couplings, 60°, spherical, in TI-P64001, for aerospace applications. NOTE Assembly in accordance with TR 4052.
EN 3851:2003 is classified under the following ICS (International Classification for Standards) categories: 49.080 - Aerospace fluid systems and components. The ICS classification helps identify the subject area and facilitates finding related standards.
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Aerospace series - Pipe couplings, 60°, spherical, in titanium alloy TI-P64001 - Swivel nuts, straightLuft- und Raumfahrt - Rohrverschraubungen 60° mit Kugelbuchse, aus Titanlegierung TI-P64001 - Gerade ÜberwurfmutternSérie aérospatiale - Raccords sphériques, 60°, en alliage de titane TI-P64001 - Ecrous prisonniers, droitsAerospace series - Pipe couplings, 60°, spherical, in titanium alloy TI-P64001 - Swivel nuts, straight49.080Aerospace fluid systems and componentsICS:Ta slovenski standard je istoveten z:EN 3851:2003SIST EN 3851:2004en01-maj-2004SIST EN 3851:2004SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 3851February 2003ICS 49.080English versionAerospace series - Pipe couplings, 60°, spherical, in titaniumalloy TI-P64001 - Swivel nuts, straightSérie aérospatiale - Raccords sphériques, 60°, en alliagede titane TI-P64001 - Ecrous prisonniers, droitsThis European Standard was approved by CEN on 19 August 2002.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, Slovak Republic, Spain, Sweden, Switzerland andUnited Kingdom.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 3851:2003 ESIST EN 3851:2004
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