EN 4803:2017

Aerospace series - Flange couplings - Swivel flange with 4 fastening holes, in heat resisting steel - Inch series

This European Standard specifies the characteristics of swivel flanges, 4 holes, for pipe couplings in heat resisting steel for inch series aerospace applications.
Nominal pressure: up to 21 000 kPa; depends on the associated seal, tube material, tube diameter and tube wall thickness in the assembly (see EN 4814).
NOTE   Assembly in accordance with TR 4815.

Luft- und Raumfahrt - Rohrverschraubung mit Flanschen - Lose Flansche mit 4 Befestigungslöchern, aus hochwarmfestem Stahl - Inch-Reihe

Diese Europäische Norm legt die Eigenschaften von losen Flanschen mit 4 Löchern für Rohrverbindungen aus hochwarmfestem Stahl in Anwendungen der Luft- und Raumfahrt (Inch-Reihe) fest.
Nenndruck: Bis zu 21 000 kPa; abhängig von der Dichtung, dem Rohrmaterial, dem Rohrdurchmesser und der Dicke der Rohrwand (siehe EN 4814).
ANMERKUNG   Montage nach TR 4815.

Série aérospatiale - Raccordement à bride - Brides flottantes avec 4 trous de fixation en acier résistant à chaud - Série en inches

La présente norme spécifie les caractéristiques des brides flottantes à 4 trous en acier résistant à chaud pour raccordements à bride destinées aux applications aérospatiales des séries en inches.
Pression nominale : Jusqu’à 21 000 kPa ; en fonction du joint, du matériau du tube, du diamètre du tube et de l’épaisseur de paroi du tube associés dans ce montage (voir l’EN 4814).

Aeronavtika - Prirobnične spojke - Vrtljiva prirobnica iz toplotno odpornega jekla s štirimi pritrdilnimi luknjami - Colska izvedba

Ta evropski standard določa lastnosti vrtljivih prirobnic s štirimi luknjami za cevne priključke iz toplotno odpornega jekla za colsko izvedbo v aeronavtiki.
Nazivni tlak: do 21.000 kPa, odvisno od povezanega tesnila, materiala cevi, premera cevi in debeline stene cevi v sestavu (glej standard EN 4814).
OPOMBA: Sestav v skladu s standardom TR 4815.

General Information

• Status: Published
• Publication Date: 09-May-2017
• Withdrawal Date: 29-Nov-2017
• ICS: 49.080 - Aerospace fluid systems and components
• Technical Committee: ASD-STAN - Aerospace
• Drafting Committee: ASD-STAN/D 3 - Mechanical
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 10-May-2017
• Completion Date: 10-May-2017
• Ref Project: SIST EN 4803:2017 - Aerospace series - Flange couplings - Swivel flange with 4 fastening holes, in heat resisting steel - Inch series

Overview

EN 4803:2017 is a European standard developed by CEN that specifies the characteristics of swivel flanges with four fastening holes, designed for pipe couplings made from heat-resisting steel in inch dimensions. This standard is part of the aerospace series and focuses on components used in aerospace fluid systems where reliability under high pressure and heat resistance are critical. The nominal pressure rating of these swivel flanges can reach up to 21,000 kPa, depending on the associated seals, tube materials, diameters, and wall thicknesses.

The standard ensures uniformity and quality across aerospace flange couplings, facilitating safety and compatibility in aerospace assemblies. It is intended for use in aerospace applications requiring heat-resisting steel swivel flanges that conform to detailed dimensional, material, and marking specifications.

Key Topics

• Flange Design: Specifies swivel flange with 4 fastening holes configured for inch series pipe couplings.
• Material Requirements: Heat-resisting steel conforming to aerospace grade specifications per EN 3468, EN 3487, and EN 4315.
• Pressure Rating: Supports nominal pressures up to 21,000 kPa, contingent on tube assembly characteristics (seal type, tube material, diameter, wall thickness).
• Dimensional Specifications: Detailed dimensional tolerances provided for nominal diameters ranging from 0.625 inch to 2.000 inches, with precise measurements on bolt holes, flange thickness, and cone angles.
• Surface Treatment: Passivation required as per EN 2516 to enhance corrosion resistance.
• Marking and Identification: Compliant with aerospace product marking standards EN 2424, category A, ensuring traceability.
• Quality Management: Production and quality assurance must align with the aerospace quality system requirements defined in EN 9100.
• Assembly Guidance: Assembly practices recommended according to TR 4815, ensuring proper installation and sealing performance.

Applications

EN 4803:2017 swivel flanges are critical components in aerospace fluid systems, offering safe, reliable connections for pipes exposed to high temperatures and pressures. Key applications include:

• Hydraulic and fuel fluid systems in aircraft and spacecraft where heat resistance and mechanical integrity are paramount.
• Aerospace engine and airframe systems requiring durable flange couplings with precise dimensional control and high pressure handling.
• Replacement or maintenance of aerospace tubing systems with stringent performance and quality requirements.
• Projects needing standardization for interchangeability and compliance with European aerospace manufacturing regulations.

By adhering to EN 4803:2017, manufacturers and engineers can ensure flanges withstand extreme operating conditions typical in aerospace environments, providing longevity and operational safety.

Related Standards

• EN 4814: Aerospace series - Flange couplings up to 21,000 kPa - Technical specifications for inch series (complements EN 4803 with detailed coupling specs).
• TR 4815: Aerospace series - Flange couplings design standard - Inch series (provides design and assembly recommendations).
• EN 2424: Aerospace series - Marking of aerospace products (ensures consistent marking and traceability).
• EN 2516: Aerospace series - Passivation of corrosion resisting steels and decontamination of nickel base alloys (defines surface treatment protocols).
• EN 3468 / EN 3487 / EN 4315: Aerospace material standards for heat-resisting steel and alloys used in the flanges.
• EN 9100: Quality Management Systems - Requirements for Aviation, Space, and Defense Organizations (framework for quality assurance compliance).

Summary

EN 4803:2017 sets the standard for swivel flanges with four fastening holes made from heat-resisting steel, tailored for critical aerospace applications requiring high pressure and heat resistance. Compliance with this standard ensures product quality, safety, and interoperability across aerospace manufacturers, delivering trusted flange couplings essential for fluid system integrity in aviation and space industries. Following EN 4803 supports effective supply chain management and regulatory adherence in aerospace component manufacturing.

Standards Content (Sample)

SLOVENSKI STANDARD
01-julij-2017
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ãWLULPLSULWUGLOQLPLOXNQMDPL&ROVNDL]YHGED
Aerospace series - Flange couplings - Swivel flange with 4 fastening holes, in heat
resisting steel - Inch series
Luft- und Raumfahrt - Rohrverschraubung mit Flanschen - Losen Flanschen mit 4
Befestigungslöchern, aus hochwarmfestem Stahl - Inch-Reihe
Série aérospatiale - Raccordement à bride - Brides flottantes avec 4 trous de fixation en
acier résistant à chaud - Série en inches
Ta slovenski standard je istoveten z: EN 4803:2017
ICS:
23.040.60 Prirobnice, oglavki in spojni Flanges, couplings and joints
elementi
49.080 /HWDOVNLLQYHVROMVNL Aerospace fluid systems and
KLGUDYOLþQLVLVWHPLLQGHOL components
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 4803
EUROPEAN STANDARD
NORME EUROPÉENNE
May 2017
EUROPÄISCHE NORM
ICS 49.080
English Version
Aerospace series - Flange couplings - Swivel flange with 4
fastening holes, in heat resisting steel - Inch series
Série aérospatiale - Raccordement à bride - Brides Luft- und Raumfahrt - Rohrverschraubung mit
flottantes avec 4 trous de fixation en acier résistant à Flanschen - Lose Flansche mit 4 Befestigungslöchern,
chaud - Série en inches aus hochwarmfestem Stahl - Inch-Reihe
This European Standard was approved by CEN on 21 November 2016.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC 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
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2017 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 4803:2017 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Required characteristics . 4
4 Designation . 6
5 Identification marking . 6
6 Technical specification . 6
7 Quality Assurance. 6

European foreword
This document (EN 4803:2017) has been prepared by the Aerospace and Defence Industries Association of
Europe - Standardization (ASD-STAN).
After enquiries and votes carried out in accordance with the rules of this Association, this European
Standard has received the approval of the National Associations and the Official Services of the member
countries of ASD, prior to its presentation to CEN.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by Nove
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