EN 6123:2016
(Main)Aerospace series - Fitting end, 24° internal cone, external thread, flareless type - Extra fine thread pitch - Inch series - Design standard
Aerospace series - Fitting end, 24° internal cone, external thread, flareless type - Extra fine thread pitch - 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 -04 up to -20 for use in hydraulic and fluid systems at 5 080 psi, diameter
1/4 inch ≤ D ≤ 1 1/4 inch (6,35 mm ≤ D ≤ 31,75 mm) for aerospace applications.
This is a design standard.
This fitting end cannot be used for plug in union.
Luft- und Raumfahrt - Endstück, Innenkonus 24°, Außengewinde, nicht gebördelt - Extrafeingewindesteigung - Inch-Reihe - Konstruktionsnorm
Diese Europäische Norm legt die Maße, Toleranzen und Anforderungen an Endstücke, Innenkonus 24°, Außengewinde, nicht gebördelt, Größe −04 bis −20 für Hydraulik- und Flüssigkeitssysteme mit 5 080 psi, Durchmesser 1/4 Inch ≤ D ≤ 1 1/4 Inch (6,35 mm ≤ D ≤ 31,75 mm) zur Anwendung in der Luft- und Raumfahrt fest.
Dies ist eine Konstruktionsnorm.
Dieses Endstück kann nicht für Steckverbindungen verwendet werden.
Série aérospatiale - Raccord, cône interne à 24° - Filetage externe, de type sans épanoui - Filetage à pas extra fin - Série inch - Norme de conception
La présente Norme européenne spécifie les dimensions, tolérances et les caractéristiques requises des raccords, cône interne à 24°, filetage externe, de type sans épanoui, taille -04 jusqu’à -20 pour une utilisation dans les systèmes hydrauliques et de fluides à 5 080 psi, diamètre ¼ inch ≤ D ≤ 1 ¼ inch (6,35 mm ≤ D ≤ 31,75 mm) pour applications aéronautiques.
Ceci est une norme de conception.
Ce raccord ne peut être utilisé comme fiche de jonction.
Aeronavtika - Končnik, 24°-notranji stožec, zunanji navoji, nerobljen - Palčne mere - Standard za projektiranje
Ta standard določa mere, tolerance in zahtevane značilnosti končnika: notranji stožec 24°, zunanji navoji, nerobljen, velikost od –04 do –20, za uporabo v hidravličnih in tekočinskih sistemih pri 5080 psi, premer
1/4 palca D 1 1/4 palca (6,35 mm D 31,75 mm) za uporabo v aeronavtiki.
To je standard za načrtovanje.
Tega končnika ni mogoče uporabiti za vtično zvezo.
General Information
- Status
- Published
- Publication Date
- 22-Mar-2016
- Withdrawal Date
- 29-Sep-2016
- Technical Committee
- ASD-STAN - Aerospace
- Drafting Committee
- ASD-STAN/D 3 - Mechanical
- Current Stage
- 6060 - Definitive text made available (DAV) - Publishing
- Start Date
- 23-Mar-2016
- Completion Date
- 23-Mar-2016
Relations
- Effective Date
- 28-Jan-2026
- Referred By
EN 6139:2020 - Aerospace series - Cap, protective, non-metallic, for EN 6123 fitting ends - Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Referred By
EN 6141:2020 - Aerospace series - Plug, protective, non-metallic, for EN 6123 fitting ends - Effective Date
- 28-Jan-2026
Overview
EN 6123:2016 is a CEN design standard for aerospace series fitting ends with a 24° internal cone, external thread and flareless design. It specifies the dimensions, tolerances and required characteristics for sizes -04 through -20 (1/4 in to 1 1/4 in; 6.35 mm to 31.75 mm) intended for hydraulic and fluid systems rated to 5 080 psi. This fitting end is a design standard and cannot be used for plug-in unions.
Key Topics
- Scope and application: Design requirements for flareless fitting ends for aerospace hydraulic systems. Size range and pressure rating are defined in the standard.
- Configuration and styles: Illustrations and notes cover styles (e.g., style G, B, E and optional style F), optional undercut, chamfers and sealing surfaces.
- Dimensions and tolerances: Linear tolerances of ± .010 in (± 0.25 mm) and angular tolerances of ± 0°30' apply unless otherwise specified. Specific dimension tables (Table 1 and Table 2) list thread, diameter and wrench-pad sizes for each diameter code (-04 to -20).
- Thread specification: External thread class and profile reference ISO 3161 (UNJ threads) as a normative reference for thread form and limits.
- Designation and marking: Example designation format: FITTING END, FLARELESS EN 6123 - 08 G 12 F, showing standard number, size code, style, optional wrench pad size and inner shoulder style.
Applications
EN 6123:2016 is intended for engineers, designers and procurement specialists in the aerospace and defence sectors who specify or produce hydraulic fittings for aircraft fluid systems. Practical uses include:
- Designing mating components for hydraulic lines where reliable sealing and high pressure capability (5 080 psi) are required.
- Specifying replacement or production fittings that must comply with European aerospace design conventions (inch series, extra fine UNJ thread pitch).
- Ensuring interchangeability by following the dimensions, tolerances and gage points defined in the standard.
Benefits:
- Consistent manufacturing tolerances for improved interchangeability and reduced field failures.
- Clear guidance on permitted wrench-pad dimensions and restrictions for lower-pressure systems (table guidance for 3 000 psi vs 5 080 psi applicability).
Related Standards
- ISO 3161 - Aerospace - UNJ threads - General requirements and limit dimensions (normative reference cited in EN 6123:2016).
- Applicable CEN/ASD-STAN aerospace design conventions and national adoptions of EN 6123:2016.
For designers and quality teams, EN 6123:2016 provides the authoritative dimensional and tolerance framework for 24° flareless fitting ends in aerospace hydraulic applications, supporting safe, repeatable installations and compatible component design.
Get Certified
Connect with accredited certification bodies for this standard
National Aerospace and Defense Contractors Accreditation Program (NADCAP)
Global cooperative program for special process quality in aerospace.
NSF-ISR
NSF International Strategic Registrations.
Orion Registrar Inc.
US-based certification body for management systems.
Sponsored listings
Frequently Asked Questions
EN 6123:2016 is a standard published by the European Committee for Standardization (CEN). Its full title is "Aerospace series - Fitting end, 24° internal cone, external thread, flareless type - Extra fine thread pitch - Inch series - Design standard". This standard covers: This European Standard specifies the dimensions, tolerances and the required characteristics of a fitting end, 24° cone, external thread, flareless type, size -04 up to -20 for use in hydraulic and fluid systems at 5 080 psi, diameter 1/4 inch ≤ D ≤ 1 1/4 inch (6,35 mm ≤ D ≤ 31,75 mm) for aerospace applications. This is a design standard. This fitting end cannot be used for plug in union.
This European Standard specifies the dimensions, tolerances and the required characteristics of a fitting end, 24° cone, external thread, flareless type, size -04 up to -20 for use in hydraulic and fluid systems at 5 080 psi, diameter 1/4 inch ≤ D ≤ 1 1/4 inch (6,35 mm ≤ D ≤ 31,75 mm) for aerospace applications. This is a design standard. This fitting end cannot be used for plug in union.
EN 6123:2016 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.
EN 6123:2016 has the following relationships with other standards: It is inter standard links to EN 10244-1:2009, EN 6139:2020, EN 4835:2018, EN 4836:2018, EN 4833:2018, EN 6141:2020. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
EN 6123:2016 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)
SLOVENSKI STANDARD
01-maj-2016
$HURQDYWLND.RQþQLNƒQRWUDQMLVWRåHF]XQDQMLQDYRMLQHUREOMHQ3DOþQHPHUH
6WDQGDUG]DSURMHNWLUDQMH
Aerospace series - Fitting end, 24° internal cone, external thread, flareless type - Inch
series - Design standard
Luft- und Raumfahrt - Endstück, Innenkonus 24°, Aussengewinde, nicht gebördelt -
Extrafeingewindesteigung - Inch-Reihe - Konsturktionsnorm
Série aérospatiale - Raccord, cône interne à 24° - filetage externe, de type sans épanoui
- Filetage à pas extra fin - Série inch - Norme de conception
Ta slovenski standard je istoveten z: EN 6123:2016
ICS:
49.080 /HWDOVNLLQYHVROMVNL Aerospace fluid systems and
KLGUDYOLþQLVLVWHPLLQGHOL components
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN 6123
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2016
EUROPÄISCHE NORM
ICS 49.080
English Version
Aerospace series - Fitting end, 24° internal cone, external
thread, flareless type - Extra fine thread pitch - Inch series
- Design standard
Série aérospatiale - Raccord, cône interne à 24°, Luft- und Raumfahrt - Endstück, Innenkonus 24°,
filetage externe, de type sans épanoui - Filetage à pas Außengewinde, nicht gebördelt -
extra fin - Série inch - Norme de conception Extrafeingewindesteigung - Inch-Reihe -
Konstruktionsnorm
This European Standard was approved by CEN on 27 September 2015.
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, 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
© 2016 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 6123:2016 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Required characteristics . 5
3.1 Configuration, dimensions and tolerances . 5
4 Designation . 10
European foreword
This document (EN 6123:2016) 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 September 2016, and conflicting national standards shall be
withdrawn at the latest by September 2016.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: 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, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
1 Scope
This European Standard specifies the dimensions, tolerances and the required characteristics of a fitting end,
24° cone, external thread, flareless type, size -04 up to -20 for use in hydraulic and fluid systems at 5 080 psi,
diameter 1/4 inch ≤ D ≤ 1 1/4 inch (6,35 mm ≤ D ≤ 31,75 mm) for aerospace applications.
This is a design standard.
This fitting end cannot be used for plug in union.
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.
Loading comments...