SIST EN 4832:2018

SLOVENSKI STANDARD
SIST EN 4832:2018
01-oktober-2018
$HURQDYWLND$GDSWHUFHYQLQDYRMQLSULNOMXþHNƒNRQLFDGRN3D
SVLQDYRMQLSULNOMXþHN]]DSRUQLPREURþHPLQQMHJRYLPUHGXNWRUMHP3DOþQH
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Aerospace series - Adaptor, Pipe coupling 24° Cone up to 35 000 kPa (5 080 psi) Ring-
locked fitting and Ring-locked fitting-reducer - Inch Series - Technical specification
Luft- und Raumfahrt - Adapter Rohrverschraubung 24° Konus bis 35 000 kPa (5 080 psi)
Anschlussverschraubung mit Sicherungsring und Reduzierer - Inch-Reihe - Technische
Lieferbedingung
Série aérospatiale - Adapteur Système de raccordement interface conique 24° jusqu'à
35 000 kPa (5 080 psi) Raccords à implanter avec bague de sécurite (normal et de
reduction) - Série inch - Spécification technique
Ta slovenski standard je istoveten z: EN 4832:2018
ICS:
49.080 /HWDOVNLLQYHVROMVNL Aerospace fluid systems and
KLGUDYOLþQLVLVWHPLLQGHOL components
SIST EN 4832:2018 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 4832:2018

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SIST EN 4832:2018


EN 4832
EUROPEAN STANDARD

NORME EUROPÉENNE

July 2018
EUROPÄISCHE NORM
ICS 49.080
English Version

Aerospace series - Adaptor, Pipe coupling 24° Cone up to
35 000 kPa (5 080 psi) Ring-locked fitting and Ring-locked
fitting-reducer - Inch Series - Technical specification
Série aérospatiale - Adapteur Système de Luft- und Raumfahrt - Adapter Rohrverschraubung 24°
raccordement interface conique 24° jusqu'à 35 000 kPa Konus bis 35 000 kPa (5 080 psi)
(5 080 psi) Raccords à implanter avec bague de Anschlussverschraubung mit Sicherungsring und
sécurite (normal et de reduction) - Série inch - Reduzierer - Inch-Reihe - Technische Lieferbedingung
Spécification technique
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 4832:2018 E
worldwide for CEN national Members.

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SIST EN 4832:2018
EN 4832:2018 (E)
Contents
Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Technical Requirements . 7
4 Performances . 13
5 Quality Assurance . 21
6 Preparation for delivery . 26
Bibliography . 27

2

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SIST EN 4832:2018
EN 4832:2018 (E)
European foreword
This document (EN 4832:2018) 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.
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SIST EN 4832:2018
EN 4832:2018 (E)
Introduction
This European Standard is co-owned standard and a functional equivalent of AS5000. There should be
no technical objection to use AS5000 as replacement of EN 4832 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 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.
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SIST EN 4832:2018
EN 4832:2018 (E)
1 Scope
This specification establishes the requirements for ring locked fitting assemblies according to EN 4833
and EN 4836, for use in aircraft systems at nominal operating pressure of 35 000 kPa (5 080 psi)
maximum and temperature range of −54 °C to +135 °C (−65 °F to +275 °F).
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 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 6102, Aerospace series — Fluid, Hydraulic, Phosphate ester-base, fire resistant — Technical
1)
specification
ISO 2685, Aircraft — Environmental test procedure for airborne equipment — Resistance to fire in
designated fire zones
ISO 2859 (all parts), Sampling procedures for inspection by attributes
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
ISO 6772, Aerospace — Fluid systems — Impulse testing of hydraulic hose, tubing and fitting assemblies
ISO 6773, Aerospace — Fluid systems — Thermal shock testing of piping and fittings
ISO 7137:1995, Aircraft — Environmental conditions and test procedures for airborne equipment
ISO 7257, Aircraft — Hydraulic tubing joints and fittings — Rotary flexure test

1) Published as ASD-STAN-Prestandard at the date of publication of this European Standard (www.asd-stan.org).
5

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SIST EN 4832:2018
EN 4832:2018 (E)
ISO 10583:1993, Aerospace fluid systems — test methods for tube/fitting assemblies
ISO 11218:1993, Aerospace — Cleanliness classification for hydraulic fluids
2)
AMS 2486, Conversion coating of titanium alloys fluoride-phosphate type
2)
AMS 2488, Anodic treatment — titanium and titanium alloys solution pH 13 or higher
2)
AMS 2700, Passivation of corrosion resistant steels
AMS 5643, Steel, corrosion-resitant, bars, wire, forgings, mechanical tubing, and rings 16Cr — 4.0Ni —
2)
0.30Cb (Nb) — 4.0Cu solution heat treated, precipitation hardenable
AMS 5659, Steel, corrosion-resistant, bars, wire, forgings, rings, and extrusions 15Cr — 4.5Ni —
2)
0.30Cb (Nb) — 3.5Cu
AMS 5731, Steel, corrosion and heat resistant, bars, forgings, tubing, and rings
15Cr 25.5Ni 1.2Mo 2.1Ti 0.006B 0.30V, consumable electrode melted, 1 800 °F (982 °C) solution heat
2)
treated
AMS 5732, Steel, corrosion and heat restant, bars, wire, forgings, tubing and rings
15Cr 25.5Ni 1.2Mo 2.1Ti 0.006B 0.30V consumable electrode melted, 1 800 °F (982 °C), solution and
2)

precipitation heat treated
AMS 5734, Steel, corrosion and heat resistant, bars, forgings, and tubing
15Cr 25.5Ni 1.2Mo 2.1Ti 0.006B 0.30V, consumable electrode melted, 1 650 °F (899 °C) solution heat
2)
treated
AMS 5737, Steel, corrosion and heat resistant, bars, wire, forgings and tubing
15Cr 25.5Ni 1.2Mo 2.1Ti 0.006B 0.30V, consumable electrode melted, 1 650 °F (899 °C), solution and
2)
precipitation heat treated
AMS 5743, Steel, corrosion and heat-resistant, bars, and forging 15.5Cr — 4.5Ni — 2.9Mo — 0.10N
2)
solution heat treated, sub-zero cooled, equalized, and over-tempered
AMS-QQ-A-225/9, Aluminium alloy 7075, bar, rod, wire, and special shapes; rolled, drawn or cold
2)
finished
AS 5620, Titanium hydraulic tubing, Ti-3Al-2.5V cold worked and stress relieved, up to 35 000 kPa
2)
(5 080 psi), requirements for qualification testing and control

2) Published by: SAE International (www.sae.org).
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SIST EN 4832:2018
EN 4832:2018 (E)
3 Technical Requirements
3.1 System Description
3.1.1 Hydraulic pressures
3.1.1.1 High pressure lines
Nominal pressure: 35 000 kPa (5 080 psi)
Maximum pressure: 42 000 kPa (6 091 psi) ⬄ relief valve setting
Intermediate pressure: 450 kPa (65 psi) ⬄ hydraulic reservoir pressure
Minimum pressure: atmospheric pressure ⬄ depressurised system
3.1.1.2 Low pressure lines
Minimum pressure: atmospheric pressure ⬄ depressurised system
Nominal pressure: 6 900 kPa (1 000 psi) up to dash 24
3.1.1.3 Suction Lines
Nominal pressure: 1 520 kPa (220 psi)
Minimum pressure: 21 kPa absolute (3 psi) ⬄ pump suction lines
3.1.2 Environmental conditions
3.1.2.1 Hydraulic pressures:
3)
Proof pressure: 2 × nominal pressure
3)
Burst pressure: 4 × nominal pressure
Air ambient temperature (outside engine and nacelle area)
Normal operating conditions: −40 °C to +94 °C (−40 °F to +201 °F)
Extreme operating conditions: −54 °C to +135 °C (−65 °F to +275 °F)
Storage conditions: −54 °C to +85 °C (−65 °F to +185 °F)
Survival conditions: −60 °C to +135 °C (−76 °F to +275 °F)

3) Nominal pressure according to 3.1.1.1 High pressure lines.
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SIST EN 4832:2018
EN 4832:2018 (E)
Air ambient temperature in engine and nacelle area
Normal operating conditions: −40 °C to +170 °C (−40 °F to +338 °F)
Extreme operating conditions: −54 °C to +200 °C (−65 °F to +392 °F)
Storage conditions: −54 °C to +85 °C (−65 °F to +185 °F)
Survival conditions: −60 °C to +200 °C (−76 °F to +392 °F)
Hydraulic fluid temperature (outside engine and nacelle area)
Normal operating conditions: −40 °C to +110 °C (−40 °F to +230 °F)
Extreme operating conditions: −54 °C to +135 °C (−65 °F to +275 °F)
Storage conditions: −54 °C to +85 °C (−65 °F to +185 °F)
Survival conditions: −60 °C to +135 °C (−76 °F to +275 °F)
Hydraulic fluid temperature in engine and nacelle area
Normal operating conditions: −40 °C to +120 °C (−40 °F to +248 °F)
Extreme operating conditions: −54 °C to +135 °C (−65 °F to +275 °F)
Storage conditions: −54 °C to +85 °C (−65 °F to +185 °F)
Survival conditions: −60 °C to +150 °C (−76 °F to +300 °F)
3.1.3 Hydraulic architecture
See Table 1.
Table 1 — size code of lines
High pressure lines 04 06 08 10 12 16 20 —
Low pressure lines 04 06 08 10 12 16 20 24
Suction lines 08 10 12 16 20 24 32 —

3.1.4 Hydraulic fluid
Type IV or V fire resistant phosphates ester based fluid in accordance with EN 6102.
3.1.5 Reliability
Plug-in unions shall be designed for the aircraft life duration:
140 000 flight hours/19 000 flight cycles/25 years, whichever comes first.
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SIST EN 4832:2018
EN 4832:2018 (E)
3.1.6 Maintainability
During the aircraft life, the plug-in unions will not need any maintenance and shall stay without leakage
or seepage.
The use of “locked” plug-in unions shall be considered in order to:
— eliminate the risk of adapter rotation in the port at tubing connection/disconnection
(overtightening or loosing) in order to prevent the risk of a port damage or hydraulic leakage;
— enable tubing connection/disconnection with one hand and one tool.
3.1.7 Particular conditions
Plug-in unions shall be:
— electrically conductive;
— designed to prevent jamming risk;
— corrosion resistant;
— galvanic corrosion resistant;
— designed with parts which cannot be lost during installation and maintenance phases;
— fire resistant (5 min) or fire proof (15 min), if required;
— UV resistant.
3.2 Design and construction
3.2.1 Materials and surfaces protection
Fittings shall be fabricated of materials listed in Table 2 and in compliance with requirements in this
specification or as specified on the applicable part standard drawings.
Table 2 — Plug-in union materials
Plug-in union
a
Titanium alloy Ti6Al-4V according to EN 3311 and EN 3314
Steel 17 – 4 PH according to AMS 5643
Steel 15 – 5 PH according to AMS 5659 or AMS 5743
Steel A 286 according to AMS 5731 or AMS 5732 or AMS 5734 or AMS 5737
Aluminium alloy 7075T73 per AMS-QQ-A-225/9 only for large sizes from –24 to –32
a
Standards are equivalent to AMS 4928 or AMS 4965 or AMS 4967.

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SIST EN 4832:2018
EN 4832:2018 (E)
Titanium alloys shall be favoured for weight saving.
Magnesium and magnesium alloy shall not be used.
All mating surfaces during assembly shall be defined in order to reduce the friction coefficient as
low as possible and not higher than 0,06.
The plug-in unions shall be designed to mate with fittings made out of any material specified in
Table 3.
The surfaces of plug-in union parts shall be protected in order to avoid the risk of corrosion, stress
corrosion cracks, embrittlement, jamming or galvanic corrosion.
In any case the requirements given in 3.1.7 shall be met.
The surfaces o f plug- in unions can be protected in the following manner:
— corrosion-resistant steel plug-in unions: by passivation treatment as specified in AMS 2700;
— titanium plug-in unions: by a fluoride conversion coating or anodising (according to AMS 2486
or AMS 2488 or equivalents);
— aluminium alloy plug- in unions: in order to meet the requirements given in 3.1.7.
NOTE Surface protection by cadmium plating is forbidden.
Table 3 — Material codes and colours
Material Code Colour
Heat-treatable corrosion-resistant steel V Metallic/grey
Titanium T Dull grey
Aluminium W Brown

3.2.2 Threads
All threads shall be in accordance with ISO 3161.
Threads may be cut, rolled or, except for titanium alloy, ground.
If threads are machined, they shall have an arithmetical mean deviation, Ra, of the profile of 3,2 μm
(125 µin) or smoother in accordance with ISO 4287.
For rolled threads, laps, and seams, whose depths are within the limits of Table 4, are acceptable on the
crest, and the non-pressure thread flank above the pitch diameter. Laps and seams are not acceptable
on any part of the pressure thread flank, in the thread root, or on the non-pressure thread flank in the
area between the thread root and the pitch diameter (see Figure 1). Stress cracks are unacceptable.
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SIST EN 4832:2018
EN 4832:2018 (E)
Table 4 — Maximum depth of laps, seams and surface irregularities in rolled threads
Depth
Size dash
In mm
04 0.005 0,13
06 0.006 0,15
08 0.007 0,18
10 to 32 0.008 0,20

3.2.3 Installation and lubrication
3.2.3.1 Thread lubricant
Threads and sleeve shoulder on tube ends shall be lubricated with hydraulic fluid conforming to
EN 6102 except no lubricating fluid shall be applied to nuts already coated with solid film lubricant.
3.2.3.2 Plug-in union installation
Port ends of plug-in unions shall be lubricated according to 3.2.3.1 and installed according to EN 4834,
using installation torques as given in Table 5.
Table 5 — Plug-in union port end, installation torque
Installation torque
Fitting assembly port size Minimum Maximum
lbfin N∙m lbfin N⋅m
04 60 6,8 100 11,3
06 180 20,3 245 27,7
08 430 48,6 510 57,6
10 600 67,8 680 76,8
12 855 96,6 945 106,8
16 800 90,4 1260 142,4
20 1520 171,7 1680 190

Fitting assembly shall be connected to 3Al-2.5V Titanium tubing according to AS 5620. No lubricant
allowed on flareless contact sealing surfaces. Tube end shall be bottomed firmly into the test assembly,
without side load, to permit the nut to spin freely when hand tightened to the hand-tight position. The
nut shall then tighten per torque values specified in Table 6 using “Double torque method” as follows:
— torque to value specified in Table 6;
— loose the Nut one full without disconnecting the assembly;
— re-torque to value specified in Table 6.
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SIST EN 4832:2018
EN 4832:2018 (E)
Table 6 — Tube fitting-nut assembly torque
Fitting Tube Wall thickness Nut installation torque
assembly OD
Minimum Maximum
size size
In In mm lbfin N∙m lbfin N∙m
04 0.250 0.025 0,635 88 9,9 133 15
06 0.375 0.030 0,762 177 20 221 25
08 0.500 0.040 1,016 398 45 487 55
10 0.625 0.050 1,270 531 60 646 73
12 0.750 0.059 1,499 707 79,9 867 98
16 1.000 0.079 2,007 885 100 1080 122
20 1.250 0.098 2,489 1017 115 1248 141

3.2.3.3 Plug-in union shape and fluid passages
On plug-in unions, where the fluid passages is drilled from each end, the offset between the drilled holes
at the meeting point shall not exceed 0,05 mm (0.010 in).
Angular misalignment shall not exceed two degrees.
For all type for plug-in unions or nuts, the dimensions related to wrenches (for tightening or holding)
shall fit with standard wrench openings (1/16 inch increments).
The concentricity between pipe connection port and the plug-in union boss end threads shall be less
than 0,05 mm (0.002 in).
3.2.4 Marking
All parts shall be marked for identification in accordance with EN 2424. The following special marking
shall be added:
— company P/N;
— manufacturer P/N.
The method of marking shall be laser marking, impression stamping, ink marking or electro-etching.
When the complete part number cannot be used for small sizes (dash size 06 and under), the marking
may be limited to the basic part number without size designation.
For qualification samples, the plug-in unions
...