EN 6126:2018

Aerospace series - Fitting end, 24° internal cone, external thread, flareless type, size -32 tube diameter D=2 inches (D=50,8 mm) extra fine thread pitch inch series - Inch series - Design standard

This European Standard specifies the dimensions, tolerances and the required characteristics of a fitting end, 24° cone, external thread, flareless type, size −32 for use in hydraulic and fluid systems at 220 psi, diameter D = 2 inches (D = 50,8 mm) for aerospace applications.
This is a design standard, not valid for order.
This fitting can not be used for plug in union.

Luft- und Raumfahrt - Anschlussstück, Innenkonus 24°, Außengewinde, nicht gebördelt, Größe -32, Rohrdurchmesser D=2 inches (D=50,8 mm) Extrafeingewindesteigung - Inch-Reihe - Konstruktionsnorm

Série aérospatiale - Raccord, cône interne à 24°, filetage externe, de type sans épanoui et dimension -32 diamètre du tube D=2 inches (D=50,8 mm) filetage à pas extra fin - Série en inches - Norme de conception

Aeronavtika - Končnik, notranji stožec 24°, zunanji navoj, nerobljen, velikost -32 premer cevi D=2 inches (D=50,8 mm), dodatna serija finih palčnih mer - Palčne mere - Standard za projektiranje

Ta evropski standard določa dimenzije, tolerance in zahtevane lastnosti končnikov (stožec 24°, zunanji navoj, nerobljen, velikost –32) za uporabo v hidravličnih in tekočinskih sistemih pri 220 psi, premer D = 2 palca (D = 50,8 mm), ki se uporabljajo v aeronavtiki.
To je standard za zasnovo in ni veljaven za naročilo.
Tega končnika ni mogoče uporabiti za vtično zvezo.

General Information

• Status: Published
• Publication Date: 07-Aug-2018
• Withdrawal Date: 27-Feb-2019
• 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: 08-Aug-2018
• Completion Date: 08-Aug-2018
• Ref Project: SIST EN 6126:2018 - Aerospace series - Fitting end, 24° internal cone, external thread, flareless type, size -32 tube diameter D=2 inches (D=50,8 mm) extra fine thread pitch inch series - Inch series - Design standard

Overview

EN 6126:2018 is a European design standard developed by the Aerospace and Defence Industries Association of Europe (ASD-STAN) and approved by CEN. This standard specifies the detailed dimensions, tolerances, and critical characteristics for a specific aerospace fitting end. It covers a 24° internal cone flareless fitting with an external thread, sized at −32, designed for tubes with a diameter of 2 inches (50.8 mm). Intended for use in hydraulic and fluid systems operating at 220 psi, this standard ensures precision and uniformity in aerospace fluid system components.

Importantly, EN 6126:2018 is a design standard only and is not valid for direct ordering. Additionally, this fitting is not suitable for plug-in unions.

Key Topics

• Fitting Type and Design

  • Flareless fitting with a 24° internal cone
  • External thread profile with extra fine inch-series thread pitch
  • Size designation: -32, supporting tube diameter of 2 inches (50.8 mm)

• Dimensional Specifications and Tolerances

  • Defined precise dimensions and tolerances outlined in multiple figures and tables
  • Expressed primarily in inches and millimeters for international usability
  • Thread class specified as 3A, following ISO aerospace UNJ thread standards

• Pressure and Application Parameters

  • Designed for hydraulic and fluid systems in aerospace environments at 220 psi
  • Tested and standardized to ensure reliability and safety in aerospace fluid components

• Design Variants

  • Several fitting end styles (G, B, E, F) providing options for different aerospace design needs
  • Optional undercuts and wrench pad dimensions to accommodate installation variations

• Standard Limitations and Usage

  • Not applicable for plug-in unions
  • Intended as a guideline for design rather than procurement
  • Compliance with referenced normative documents such as ISO 3161 for UNJ threads

Applications

EN 6126:2018 serves as a crucial guideline for aerospace engineers and designers involved in the development of hydraulic and fluid systems. Its applications include:

• Aerospace Hydraulic Systems
  Providing critical design parameters for secure and leak-resistant fittings in aircraft hydraulic systems that operate under specified pressure conditions.

• Fluid Transfer Lines
  Enabling manufacturers to standardize flareless fittings for reliable fluid conveyance, maintaining system integrity during aircraft operation.

• Component Manufacturing
  Assisting manufacturers to produce fitting ends that conform to aerospace industry standards, ensuring interchangeability, safety, and performance.

• Design Engineering
  Guiding aerospace design engineers to incorporate standardized fittings that meet stringent aerospace safety and functional requirements.

Related Standards

EN 6126:2018 references and aligns with various international and aerospace standards to ensure compatibility and coherence across industry practices:

• ISO 3161 – Aerospace UNJ Threads: General requirements and limit dimensions for aerospace thread forms used in conjunction with EN 6126 fittings.
• ASD-STAN Standards – Broader aerospace component design frameworks that complement EN 6126’s fitting specifications.
• CEN-CENELEC Internal Regulations – Framework for harmonization and adoption of European standards across member countries.

Professionals working with hydraulic and fluid system components in aerospace should consider EN 6126:2018 alongside these standards to ensure comprehensive compliance and optimal system performance.

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By adhering to EN 6126:2018, aerospace manufacturers and engineers can achieve enhanced safety, consistency, and quality in the design of flareless fittings with 24° internal cones and external threads, tailored for demanding hydraulic applications at a 2-inch tube diameter. This supports the aerospace industry's rigorous requirements for fluid system integrity and reliability.

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Luft- und Raumfahrt - Anschlussstück, Innenkonus 24°, Aussengewinde, nicht gebördelt, Größe -32 rohrdurchmesser D=2 inches (D=50,8 mm) Extrafeingewindesteigerung - Inch Reihe - KonstruktionsnormSérie aérospatiale - Raccord, cône interne à 24°, filetage externe, de type sans épanoui et dimension -32 diamètre du tube D=2 inches (D=50,8 mm) filetage à pas extra fin - Série en inches - Norme de conceptionAerospace series - Fitting end, 24° internal cone, external thread, flareless type, size -32 tube diameter D=2 inches (D=50,8 mm) extra fine thread pitch inch series - Inch series - Design standard49.080Aerospace fluid systems and componentsICS:Ta slovenski standard je istoveten z:EN 6126:2018SIST EN 6126:2018en,fr,de01-november-2018SIST EN 6126:2018SLOVENSKI
STANDARD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 6126
August
t r s z ICS
v {ä r z r English Version
Aerospace series æ Fitting endá
t v ¹ internal coneá external threadá flareless typeá size æ u t tube diameter D é t inches series æ Design standard Série aérospatiale æ Raccordá cône interne à
t v ¹á filetage externeá de type sans épanoui et dimension æ u t pas extra fin æ Série en inches æ Norme de conception
Luftæ und Raumfahrt æ Anschlussstücká Innenkonus
t v ¹á Außengewindeá nicht gebördeltá Größe æ u tá Extrafeingewindesteigung æ InchæReihe æ Konstruktionsnorm This European Standard was approved by CEN on
t t January
t r s zä
egulations which stipulate the conditions for giving this European Standard the status of a national standard without any alterationä Upætoædate lists and bibliographical references concerning such national standards may be obtained on application to the CENæCENELEC Management Centre or to any CEN memberä
translation under the responsibility of a CEN member into its own language and notified to the CENæCENELEC Management Centre has the same status as the official versionsä
CEN members are the national standards bodies of Austriaá Belgiumá Bulgariaá Croatiaá Cyprusá Czech Republicá Denmarká Estoniaá Finlandá Former Yugoslav Republic of Macedoniaá Franceá Germanyá Greeceá Hungaryá Icelandá Irelandá Italyá Latviaá Lithuaniaá Luxembourgá Maltaá Netherlandsá Norwayá Polandá Portugalá Romaniaá Serbiaá Slovakiaá Sloveniaá Spainá Swedená Switzerlandá Turkey and United Kingdomä
EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre:
Rue de la Science 23,
B-1040 Brussels
t r s z CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membersä Refä Noä EN
x s t xã t r s z ESIST EN 6126:2018
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