EN 4835:2018

SLOVENSKI STANDARD
01-oktober-2018
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Aerospace series - Installation and removal requirements for Ring locked fitting and
reducer, 24° Cone up to 35 000 kPa (5 080 psi) - Inch Series
Luft- und Raumfahrt - In- und Ausbaubedingungen für Anschlussverschraubung und
Reduzierer mit Sicherungsring 24° Konus bis 35 000 kPa (5 080 psi) - Inch-Reihe
Série aérospatiale - Spécification de montage et démontage des raccords à implanter
avec bague de sécurité, interface conique 24° jusqu'á 35 000 kPa (5 080 psi) - Série inch
Ta slovenski standard je istoveten z: EN 4835:2018
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 4835
EUROPEAN STANDARD
NORME EUROPÉENNE
August 2018
EUROPÄISCHE NORM
ICS 49.080
English Version
Aerospace series - Installation and removal requirements
for Ring locked fitting and reducer, 24° Cone up to 35 000
kPa (5 080 psi) - Inch Series
Série aérospatiale - Spécification de montage et Luft- und Raumfahrt - In- und Ausbaubedingungen für
démontage des raccords à implanter avec bague de Anschlussverschraubung und Reduzierer mit
sécurité, interface conique 24° jusqu'á 35 000 kPa (5 Sicherungsring 24° Konus bis 35 000 kPa (5 080 psi) -
080 psi) - Série inch Inch-Reihe
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 4835:2018 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Installation instructions . 6
4 Replacement instructions . 14
Bibliography . 17

European foreword
This document (EN 4835:2018) 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 February 2019, and conflicting national standards
shall be withdrawn at the latest by February 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 AS5551. There should be
no technical objection to use AS5551 as replacement of EN 4835 parts. 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 International 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 installation and removal requirements for adaptors and
reducers, threaded, with lockring for pipe couplings 24° according to EN 4833 and EN 4836.
This standard establishes an accurate procedure of adaptor installation, removal and reinstallation to
ensure the repeatability of the installation operation and to ensure the effective compliance to sealing
and locking requirements.
The adaptor shown on all Figures of this standard is given as an example for the 24° internal cone
interface according to EN 6123.
This procedure is used for adaptors 24°, for nominal pressure up to 35 000 kPa (5 080 psi).
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 2435-001, Aerospace series — Paints and varnishes — Corrosion resistant chromated two component
cold curing primer — Part 001: Minimum requirements
EN 4833, Aerospace series — Pipe coupling 24° Cone up to 35 000 kPa (5 080 psi) Ring-locked fitting —
1)
Flared End — Inch Series — with Extra Fine Thread Pitch
EN 4834, Aerospace series — Adaptor, Pipe coupling 24° Cone up to 35 000 kPa (5 080 psi) Port for Ring
1)
locked fitting — Inch Series — Geometric configuration
EN 4836, Aerospace series — Adaptor, Pipe coupling 24° Cone up to 35 000 kPa (5 080 psi) Ring-locked
1)
fitting Reducer — Flared End — with Extra Fine Thread Pitch — Inch Series
EN 6123, Aerospace series — Fitting end, 24° internal cone, external thread, flareless type — Extra fine
thread pitch — Inch series — Design standard
ISO 3161, Aerospace — UNJ threads — General requirements and limit dimensions
ISO 16031-1, Aerospace fluid systems — O-rings, inch series: Inside diameters and cross sections,
tolerances and size-identification codes — Part 1: Close tolerances for hydraulic systems
2)
AS8879, Screw threads — UNJ profile, inch controlled radius root with increased minor diameter

1) Published as ASD-STAN Prestandard at the date of publication of this standard (www.asd-stan.org).
2) Published by: SAE International (www.sae.org).
3 Installation instructions
3.1 Engineering information
Key
1 The fitting assemblies according to EN 4833 and the fitting reducer according to EN 4836
provide a semi-permanent male fitting for use in fluid systems of 35 000 kPa (5 080 psi) and
compatible with titanium at −54 °C to +135 °C (−65 °F to +230 °F) temperature range.
2 The lockring is driven into the mating port serrations after the fitting assembly or fitting reducer
assembly have been torqued. This prevents the fitting assembly from rotating in the port during
coupling nut assembly and disassembly and also eliminates the necessity of lock wiring the fitting.
Only one wrench is required to install or remove coupling nut.
3 Seal is metal to metal with O-ring size according to Table 1. O-ring material compound shall be
selected and specified by the using design activity and shall be selected based upon suitability
with fluid type and temperature range.
4 Tapped hole (boss port side) for the 24° adaptor installation.
5 Port side interface of the adaptor according to “3.2 Port preparation”.
6 Thread A
7 Thread B
Figure 1
Table 1 — General information – Ring locked fitting
Dimensions in millimetres
b b
O-ring size code
Thread A Thread B
24°
Adaptor part no. X
coupling (as per
ISO 3161 ISO 3161
(as per EN 4833) max.
a
ISO 16031-1)
code
Class 3A Class 3A
04 04 0.4375 − 28UNJEF 0.3125 − 24UNJF 010 3,15
06 06 0.5625 − 24UNJEF 0.4375 − 20UNJF 012
08 08 0.7500 − 20UNJEF 0.5625 − 18UNJF 014 3,30
10 10 0.8750 − 20UNJEF 0.6875 − 24UNJEF 016
12 12 1.0625 − 18UNJEF 0.8125 − 20UNJEF 018
16 16 1.3125 − 16UNJ 1.1250 − 18UNJEF 022 3,56
20 20 1.6250 − 16UNJ 1.3125 − 18UNJEF 026
a Size code corresponds to the nominal tube diameter in 1/16 inch.

b For information only, please refer to EN 6123.

3.2 Port preparation
3.2.1 General
The manufacturing sequence of port preparation is for information only.
Qualification of the assembly is required for each manufacturing sequence and type of tool for a given
port material installation method and nominal pressure.
The hole shall confirm to EN 4834, using the applicable:
 tools for tap drilling;
 port machining;
 serration broaching;
 thread cutting.
NOTE The design office can specify a hole without serration pre-broaching, when low resistance material is
used.
3.2.2 Tap drilling
Drill 0.015 in to 0.030 in smaller than the specified minor diameter modified. The porting tool will size
the minor diameter and provide balance of cavity configuration ready for broaching serration.
Drill through or to a depth as required in Table 2. See Figure 3.
Table 2 — Port drilling
Dimensions in Inches
Port dash
B C D E F G
number
04 0.68 0.495 − 0.498 0.339 − 0.341 0.088 − 0.098 0.153 − 0.158 0.296 − 0.301
06 0.85 0.675 − 0.678 0.464 − 0.466 0.103 − 0.113 0.168 − 0.173
08 1.04 0.784 − 0.787 0.582 − 0.584 0.103 − 0.113 0.168 − 0.173 0.311 − 0.316
10 1.17 1.015 − 1.018 0.725 − 0.727 0.103 − 0.113 0.168 − 0.173
12 1.42 1.139 − 1.142 0.899 − 0.901 0.103 − 0.113 0.168 − 0.173
0.343 − 0.348
16 1.67 1.427 − 1.430 1.162 − 1.164 0.103 − 0.113 0.168 − 0.173
20 1.98 1.750 − 1.753 1.387 − 1.389 0.130 − 0.140 0.195 − 0.200
0.375 − 0.380
24 2.23 2.000 − 2.005 1.664 − 1.666 0.130 − 0.140 0.195 − 0.200

Dimensions in inches (millimetres)

Key
1 Thread mod per AS8879 minor dia mod
a C bore
b Min full thread depth
c Recommended minimum boss length using
Figure 2
3.2.3 Port machining
The port machining shall be made in accordance with EN 4834.
These fitting assemblies require special tooling for proper installation. Tooling shall be certified to
have been used during the qualification of fitting assemblies.
3.2.4 Serration broaching
Serration broaching shall be made according to EN 4834. Special broaching tool can be used. In this
case the following procedure shall apply:
1) Prior to broaching, the cutter teeth will rest on the surface of the boss and the body of the tool will
be free to move up and down. Note that the nut should be backed away from the body of the tool.
2) The tool can be hand-held or used under a press.
3) Locate broaching tool pilot into the port.
4) Slowly apply a force to the mandrel while holding the body to allow the teeth to broach into the
parent material counterbore.
5) Broaching is complete when the external shoulder of the mandrel contacts the internal shoulder in
the body.
6) The installation force is then relieved and the tool is ready for removal.
7) To remove the tool from the boss, turn the nut in clockwise direction against the body and the
mandrel will move up and show the cutting teeth from the counterbore.
3.2.5 Thread cutting
Using the correct tool tap the port to at least the minimum full thread depth H specified (see Table 3
and Figure 3). Remove all chips, burrs, cutting fluids etc., from the threads and the cut area.
Table 3 — Thread prepa
...