EN 4833:2018
(Main)Aerospace series - Pipe coupling 24° Cone up to 35 000 kPa (5 080 psi) Ring-locked fitting - Flareless End - Inch Series - Extra Fine Thread Pitch
Aerospace series - Pipe coupling 24° Cone up to 35 000 kPa (5 080 psi) Ring-locked fitting - Flareless End - Inch Series - Extra Fine Thread Pitch
This standard specifies the dimensions, tolerances, required characteristics and the mass of an adaptor, flareless tube end EN 6123, ring locked type, for use in 35 000 kPa (5 080 psi) working pressure systems.
Luft- und Raumfahrt - Rohrverschraubung 24° Konus bis 35 000 kPa (5 080 psi) gerade Anschlussverschraubung mit Sicherungsring - Inch-Reihe - extra feine Gewindesteigung
Série aérospatiale - Système de raccordement interface conique 24° jusqu à 35 000 kPa (5 080 psi) Raccord à implanter avec bague de sécurité - Série inch - Filetage à pas extra-fin
Aeronavtika - Cevni priključek 24° Konica do 35 000 kPa (5080 psi) Navojni priključek z zapornim obročem - Brez razširjenega končnika - Palčne mere - Ekstra fin navojni korak
Ta standard določa dimenzije, odstopanja, zahtevane lastnosti in maso adapterja, brez razširjenega končnika (EN 6123), z navojnim priključkom z zapornim obročem, za uporabo v tlačnih sistemih do 35 000 kPa (5080 psi) .
General Information
EN 4833:2018 Overview
EN 4833:2018 is a European standard developed by CEN, specifying the technical requirements for aerospace pipe couplings with a 24° cone design. This standard addresses ring-locked fittings with flareless ends, tailored for high-pressure aerospace fluid systems operating up to 35,000 kPa (5,080 psi). It applies to inch series fittings featuring an extra fine thread pitch, ensuring precise and reliable performance in demanding aerospace applications.
The standard covers dimensions, tolerances, material specifications, surface treatments, marking, quality assurance, and technical delivery requirements, aligning with aerospace industry expectations for safety, durability, and interoperability. EN 4833:2018 is functionally equivalent to the AS5550 standard, facilitating global compatibility and use.
Key Topics of EN 4833:2018
Scope and Application
Specifies adaptor and flareless tube end design (EN 6123 compliant), ring-locked type fittings for high-pressure aerospace fluid systems up to 35,000 kPa.Dimensions and Tolerances
Dimensions are presented in millimeters and inches with tight tolerances to ensure consistent fitting assembly and performance.
Typical tolerances include:- Linear ±0.13 mm (±0.0050 in)
- Angular ±0°30’
- Edge break radius between 0.08 mm and 0.38 mm
Material and Treatment
Utilizes aerospace-grade materials such as titanium alloy Ti-6Al-4V and corrosion-resistant steels (CRES A286) with designated heat and surface treatments like anodic and passivation processes for enhanced durability and chemical resistance.Surface Quality
Machined surfaces maintain a surface roughness of 3.175 µm (125 µin) Ramax, while sealing surfaces achieve 1.6 µm (63 µin) Ramax, guaranteeing optimal sealing and leak prevention.Marking and Traceability
Components must be permanently marked with manufacturer identification (name, trademark, or cage code) for traceability and quality assurance, using laser marking or impression stamping.Installation Guidelines
Installation must conform to EN 4835 standards to ensure proper assembly and system integrity in aerospace environments.Quality Assurance
Requires suppliers to follow stringent inspections and qualification tests per EN 9133 and EN 4832, supported by aerospace-recognized quality systems like EN 9100.REACH Compliance
Confirms that fittings comply with REACH regulations and contain no restricted substances, supporting environmental and safety standards.
Applications
EN 4833:2018 is primarily used for:
Aerospace Fluid Systems
Providing durable, high-pressure pipe coupling solutions suitable for fuel, hydraulic, and pneumatic lines aboard aircraft and spacecraft.Defense and Space Industries
Ensuring reliable fluid system connections in military aircraft, satellites, and launch vehicles where leak-proof, high-pressure resistant fittings are critical.High-Precision Assembly
Supporting exacting standards in aerospace manufacturing where dimensional accuracy, surface finish, and material integrity impact system safety and performance.Maintenance and Repair Operations
Enabling aerospace maintenance teams to replace or upgrade pipe couplings with standardized, high-quality parts ensuring system compatibility and safety.
Related Standards
EN 6123
Design standard for flareless tube ends used within the ring-locked fitting system.EN 4832 & EN 4835
Complementary standards covering pipe couplings and installation/removal requirements for ring-locked fittings up to 35,000 kPa.EN 9100 & EN 9133
Aerospace quality management systems and qualification procedures critical for production and supplier control.ISO 3161 & ISO 4287
Standards governing thread specifications and surface texture profiles relevant to coupling manufacturing.AMS Specifications (e.g., AMS 2486/2488, AMS 5731-5737)
Material and treatment specifications for titanium and corrosion-resistant steels.
Keywords: EN 4833:2018, aerospace pipe coupling, ring-locked fitting, 24° cone, flareless end, inch series, extra fine thread, high-pressure fitting, titanium alloy fittings, aerospace fluid systems, CEN standard, AS5550 equivalent, aerospace quality assurance, EN 4835 installation, aerospace fluid connectors.
Standards Content (Sample)
SLOVENSKI STANDARD
01-oktober-2018
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Aerospace series - Pipe coupling 24° Cone up to 35 000 kPa (5 080 psi) Ring-locked
fitting - Flareless End - Inch Series - Extra Fine Thread Pitch
Luft- und Raumfahrt - Rohrverschraubung 24° Konus bis 35 000 kPa (5 080 psi) gerade
Anschlussverschraubung mit Sicherungsring - Inch-Reihe - extra feine Gewindesteigung
Série aérospatiale - Système de raccordement interface conique 24° jusqu à 35 000 kPa
(5 080 psi) Raccord à implanter avec bague de sécurité - Série inch - Filetage à pas
extra-fin
Ta slovenski standard je istoveten z: EN 4833:2018
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 4833
EUROPEAN STANDARD
NORME EUROPÉENNE
July 2018
EUROPÄISCHE NORM
ICS 49.080
English Version
Aerospace series - Pipe coupling 24° Cone up to 35 000
kPa (5 080 psi) Ring-locked fitting - Flareless End - Inch
Series - Extra Fine Thread Pitch
Série aérospatiale - Système de raccordement interface Luft- und Raumfahrt - Rohrverschraubung 24° Konus
conique 24° jusqu à 35 000 kPa (5 080 psi) Raccord à bis 35 000 kPa (5 080 psi) gerade
implanter avec bague de sécurité - Série inch - Filetage Anschlussverschraubung mit Sicherungsring - Inch-
à pas extra-fin Reihe - extra feine Gewindesteigung
This European Standard was approved by CEN on 3 December 2017.
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: Rue de la Science 23, B-1040 Brussels
© 2018 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 4833:2018 E
worldwide for CEN national Members.
Contents
Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Requirements . 6
4 Quality Assurance . 10
5 Designation . 10
6 Marking . 11
7 Preparation for delivery . 11
8 Technical Specification . 11
9 REACH . 11
Bibliography . 12
European foreword
This document (EN 4833:2018) 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 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 January 2019, and conflicting national standards shall
be withdrawn at the latest by January 2019.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN 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, Serbia, Slovakia, Slovenia, Spain, Sweden,
Switzerland, Turkey and the United Kingdom.
Introduction
This European Standard is co-owned standard and a functional equivalent of AS5550. There should be
no technical objection to use AS5550 as replacement of EN 4833 parts. Table 3 shows the equivalent
cross reference of EN 4833 part numbers to AS5550 part numbers. Further revisions to this standard
shall be coordinated with the SAE committee.
European standards use the International System of units (SI); however, large segments of the
aerospace industry make use of other measurement systems as a matter of common working practice.
All dimensions and units used in this standard are given in SI units, with other units also indicated for
the convenience of the user.
The decimal sign used in European standards is the comma (“,”); however, the comma is not used in
common working practice with non-SI dimensions. Therefore, in common with many other aerospace
standards, the decimal point (“.”) is used in this standard when providing dimensions in inch-pound
units.
NOTE The use of non-SI units and the decimal point in this standard does not constitute general acceptance
of measurement systems other than SI within European standards.
1 Scope
This European Standard specifies the dimensions, tolerances, required characteristics and the mass of
an adaptor, flareless tube end EN 6123, ring locked type, for use in 35 000 kPa (5 080 psi) working
pressure systems.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments)
applies.
EN 2424, Aerospace series — Marking of aerospace products
EN 3311, Aerospace series — Titanium alloy TI-P64001 (Ti-6Al-4V) — Annealed — Bar for machining
D < 110 mm
EN 3314, Aerospace series — Titanium alloy TI-P64001, solution treated and aged; bar for machining
D ≤ 75 mm
EN 4315, Aerospace series — Heat resisting alloy FE-PA2601 (X6NiCrTiMoV26-15) — Solution treated
and precipitation treated, bar and section a or D ≤ 100 mm, R ≥ 900 MPa
m
EN 4317, Aerospace series — Heat resisting alloy FE-PA2601 (X6NiCrTiMoV26-15) — Non heat treated,
forging stock a or D ≤ 200 mm
EN 4832, Aerospace series — Pipe coupling 24°Cone up to 35 000 kPa (5 080 psi) Ring-locked fitting and
1)
Ring-locked fitting-reducer — Inch Series — Technical specification
EN 4835, Aerospace series — Installation and removal requirements for Ring locked fitting and reducer,
1)
24° Cone up to 35 000 kPa (5 080 psi) — Inch Series
EN 6123, Aerospace series — Fitting end, 24° internal cone, external thread, flareless type — Extra fine
thread pitch — Inch series — Design standard
ISO 1302, Geometrical Product Specifications (GPS) — Indication of surface texture in technical product
documentation
ISO 3161, Aerospace — UNJ threads — General requirements and limit dimensions
ISO 4287, Geometrical Product Specification (GPS) — Surface texture: Profile method — Terms,
definitions and surface texture parameters
2)
AMS 2486,
...
Frequently Asked Questions
EN 4833:2018 is a standard published by the European Committee for Standardization (CEN). Its full title is "Aerospace series - Pipe coupling 24° Cone up to 35 000 kPa (5 080 psi) Ring-locked fitting - Flareless End - Inch Series - Extra Fine Thread Pitch". This standard covers: This standard specifies the dimensions, tolerances, required characteristics and the mass of an adaptor, flareless tube end EN 6123, ring locked type, for use in 35 000 kPa (5 080 psi) working pressure systems.
This standard specifies the dimensions, tolerances, required characteristics and the mass of an adaptor, flareless tube end EN 6123, ring locked type, for use in 35 000 kPa (5 080 psi) working pressure systems.
EN 4833:2018 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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