Metallic tube connections for fluid power and general use - Part 1: 24° cone connectors (ISO 8434-1:2018, Corrected version 2018-10)

This document specifies the general and dimensional requirements for 24° cone connectors using
cutting ring and O‑ring seal cone (referred to as DKO) suitable for use with ferrous and non‑ferrous
tubes with outside diameters from 4 mm to 42 mm inclusive. These connectors are for use in fluid power
and general applications within the limits of pressure and temperature specified in this document.
They are intended for the connection of plain end tubes and hose fittings to ports in accordance with
ISO 6149-1, ISO 1179-1 and ISO 9974-1. (See ISO 12151-2 for a related hose fitting specification.)
These connectors provide full-flow connections in hydraulic systems operating to the working
pressures shown in Table 1. Because many factors influence the pressure at which a system performs
satisfactorily, these values are not intended to be understood as guaranteed minimums. For every
application, sufficient testing is meant to be conducted and reviewed by both the user and manufacturer
to ensure that required performance levels are met.
NOTE 1 For new designs in hydraulic fluid power applications, see the requirements given in 9.6. Where
the requirements of the application allow for the use of elastomeric seals, connector designs that conform to
International Standards and incorporate elastomeric sealing are preferred.
NOTE 2 For use under conditions outside the pressure and/or temperature limits specified, see 5.4.
This document also specifies a performance and qualification test for these connectors.

Metallische Rohrverschraubungen für Fluidtechnik und allgemeine Anwendung - Teil 1: Verschraubungen mit 24°-Konus (ISO 8434-1:2018, korrigierte Fassung 2018-10)

Dieses Dokument legt allgemeine und maßliche Anforderungen an 24°-Rohrverschraubungen mit Schneid-ring und O-Ring-Dichtkegel (kurz als DKO bezeichnet) fest, die für die Verwendung mit Stahlrohren und Rohren aus Nicht-Eisenmetallen mit einem Außendurchmesser von 4 mm bis einschließlich 42 mm geeignet sind. Diese Rohrverschraubungen sind für die Fluidtechnik und allgemeine Anwendungen im festgelegten Temperatur- und Druckbereich nach diesem Dokument vorgesehen.
Sie sind für die Verbindung von Rohren mit geraden Enden und Schlaucharmaturen an Einschraublöchern nach ISO 6149-1, ISO 1179-1 und ISO 9974-1 vorgesehen. (Festlegungen für Schlaucharmaturen, siehe ISO 12151-2.)
Diese Rohrverschraubungen sorgen in Hydraulikanlagen mit Arbeitsdrücken nach Tabelle 1 für Verbin-dungen mit vollem Durchfluss. Da der Druck, bei dem eine Anlage zufriedenstellend funktionsfähig ist, durch viele Faktoren beeinflusst wird, sind diese Werte nicht als abgesicherte Mindestwerte zu betrachten. Für jeden Anwendungsfall müssen ausreichende Prüfungen durchgeführt werden, die sowohl vom Anwender als auch vom Hersteller zu bewerten sind, um sicherzustellen, dass die geforderten Leistungsstufen eingehalten werden.
ANMERKUNG 1 Für Neukonstruktionen in hydraulischen Anlagen der Fluidtechnik gelten die Anforderungen in 9.6. Sofern nach den Anforderungen für den jeweiligen Anwendungsfall die Verwendung von Elastomerdichtungen zulässig ist, werden für die Rohrverschraubung Ausführungen nach Internationalen Normen mit Elastomerdichtungen bevor-zugt.
ANMERKUNG 2 Für Anwendungsfälle außerhalb des in dieser Norm festgelegten Druck- und/oder Temperatur-bereichs, siehe 5.4.
Dieses Dokument legt ferner eine Prüfung der Funktionsfähigkeit und Eignung dieser Rohrverschraubungen fest.

Raccordements de tubes métalliques pour transmissions hydrauliques et pneumatiques et applications générales - Partie 1: Raccords coniques à 24° (ISO 8434-1:2018, Version corrigée 2018-10)

Le présent document spécifie les exigences générales et dimensionnelles relatives à la conception et à la performance des raccords à compression à 24°, utilisant une bague de compression et un cône à joint torique (désigné comme DKO) qui sont adaptés à l'utilisation avec des tubes en métaux ferreux et non ferreux de diamètre extérieur de 4 mm à 42 mm inclus. Ces raccords sont utilisés dans les transmissions hydrauliques et pneumatiques et les applications générales dans les limites de pression et de température spécifiées dans le présent document.
Ils sont prévus pour le raccordement de tubes et de tuyaux à des orifices conformes à l'ISO 6149‑1, l'ISO 1179‑1 et l'ISO 9974‑1. (Voir l'ISO 12151‑2 pour les spécifications relatives aux raccordements flexibles.)
Ces raccords fournissent des connexions pleins débits dans des transmissions hydrauliques fonctionnant à des pressions d'utilisation telles que montrées dans le Tableau 1. À cause de l'influence de nombreux facteurs sur la pression à laquelle le système fonctionne de manière satisfaisante, ces valeurs ne sont pas destinées à être considérées comme des minima garantis. Pour chaque application, des essais suffisants sont à réaliser et à examiner à la fois par l'utilisateur et le fabricant, afin de s'assurer que le niveau de performance requis est atteint.
NOTE 1 Pour les nouvelles conceptions pour des applications de transmissions hydrauliques, voir les exigences données en 9.6. Dans les cas où les exigences de l'application permettent l'utilisation de joints en élastomères, la conception des raccords doit se conformer aux Normes internationales et incorporer de préférence des joints élastomères.
NOTE 2 Pour des utilisations en dehors des limites de températures et/ou de pressions spécifiées, voir 5.4.
Le présent document décrit également un essai de performance et de qualification relatif à ces raccords.

Kovinski cevni priključki za fluidno tehniko in za splošno uporabo - 1. del: Stožčasti priključki z naklonom 24° (ISO 8434-1:2018, popravljena različica 2018-10)

Ta dokument določa splošne in dimenzijske zahteve za stožčaste priključke z naklonom 24° z uporabo rezalnega obroča ter O-obročnega tesnilnega stožca (DKO), primernega za uporabo z železnimi in neželeznimi cevmi z zunanjimi premeri od 4 mm do vključno 42 mm. Ti priključki so namenjeni uporabi v fluidni tehniki ter splošnih načinih uporabe znotraj mejnih vrednosti tlaka in temperature, določenih v tem dokumentu.
Namenjeni so za priključitev navadnih končnih cevi in priključkov cevi v vrata v skladu s standardi ISO 6149-1, ISO 1179-1 in ISO 9974-1 (za ustrezne cevne fitinge glej ISO 12151-2). Ti priključki tvorijo priključke za poln pretok v hidravličnih sistemih, ki delujejo pri vrednostih delovnega tlaka, prikazanih v preglednici 1. Ker številni dejavniki vplivajo na tlak, pri katerem sistem deluje zadovoljivo, te vrednosti ne pomenijo zajamčenih minimalnih vrednosti. Za vsak način uporabe je treba opraviti ustrezno preskušanje, ki ga morata pregledati tako uporabnik kot proizvajalec, da zagotovita izpolnitev zahtevanih ravni zmogljivosti.
OPOMBA 1: Za uporabo novih modelov v fluidni tehniki glej zahteve, podane v točki 9.6. Kadar zahteve načina uporabe dovoljujejo uporabo elastomernih tesnil, imajo prednost modeli priključkov, ki so v skladu z mednarodnimi standardi in zagotavljajo elastomerno tesnjenje.
OPOMBA 2: Za uporabo pod pogoji zunaj določenih mejnih vrednosti tlaka in/ali temperature glej točko 5.4.
Ta dokument za te priključke določa tudi zmogljivostni in kvalifikacijski preskus.

General Information

Status
Published
Public Enquiry End Date
30-Nov-2016
Publication Date
17-Sep-2018
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
07-Sep-2018
Due Date
12-Nov-2018
Completion Date
18-Sep-2018

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SLOVENSKI STANDARD
SIST EN ISO 8434-1:2018
01-november-2018
Nadomešča:
SIST EN ISO 8434-1:2007
SIST EN ISO 8434-1:2007/AC:2009
Kovinski cevni priključki za fluidno tehniko in za splošno uporabo - 1. del:

Stožčasti priključki z naklonom 24° (ISO 8434-1:2018, popravljena različica 2018-

10)

Metallic tube connections for fluid power and general use - Part 1: 24° cone connectors

(ISO 8434-1:2018, Corrected version 2018-10)

Metallische Rohrverschraubungen für Fluidtechnik und allgemeine Anwendung - Teil 1:

Verschraubungen mit 24°-Konus (ISO 8434-1:2018, korrigierte Fassung 2018-10)

Raccordements de tubes métalliques pour transmissions hydrauliques et pneumatiques

et applications générales - Partie 1: Raccords coniques à 24° (ISO 8434-1:2018, Version

corrigée 2018-10)
Ta slovenski standard je istoveten z: EN ISO 8434-1:2018
ICS:
23.100.40 Cevna napeljava in sklopke Piping and couplings
SIST EN ISO 8434-1:2018 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN ISO 8434-1:2018
---------------------- Page: 2 ----------------------
SIST EN ISO 8434-1:2018
EN ISO 8434-1
EUROPEAN STANDARD
NORME EUROPÉENNE
August 2018
EUROPÄISCHE NORM
ICS 23.100.40 Supersedes EN ISO 8434-1:2007
English Version
Metallic tube connections for fluid power and general use -
Part 1: 24° cone connectors (ISO 8434-1:2018, Corrected
version 2018-10)

Raccordements de tubes métalliques pour Metallische Rohrverschraubungen für Fluidtechnik

transmissions hydrauliques et pneumatiques et und allgemeine Anwendung - Teil 1: Verschraubungen

applications générales - Partie 1: Raccords coniques à mit 24°-Konus (ISO 8434-1:2018)

24° (ISO 8434-1:2018, Version corrigée 2018-10)
This European Standard was approved by CEN on 4 July 2018.

This European Standard was corrected and reissued by the CEN-CENELEC Management Centre on 19 December 2018.

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 NORMALISATIO N
EUROPÄISCHES KOMITEE FÜR NORMUN G
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 ISO 8434-1:2018 E

worldwide for CEN national Members.
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SIST EN ISO 8434-1:2018
EN ISO 8434-1:2018 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

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SIST EN ISO 8434-1:2018
EN ISO 8434-1:2018 (E)
European foreword

This document (EN ISO 8434-1:2018) has been prepared by Technical Committee ISO/TC 131 "Fluid

power systems" in collaboration with Technical Committee ECISS/TC 110 “Steel tubes, and iron and

steel fittings” the secretariat of which is held by UNI.

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.

This document supersedes EN ISO 8434-1:2007.

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.
Endorsement notice

The text of ISO 8434-1:2018, Corrected version 2018-10 has been approved by CEN as EN ISO 8434-

1:2018 without any modification.
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SIST EN ISO 8434-1:2018
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SIST EN ISO 8434-1:2018
INTERNATIONAL ISO
STANDARD 8434-1
Third edition
2018-07
Corrected version
2018-10
Metallic tube connections for fluid
power and general use —
Part 1:
24° cone connectors
Raccordements de tubes métalliques pour transmissions hydrauliques
et pneumatiques et applications générales —
Partie 1: Raccords coniques à 24°
Reference number
ISO 8434-1:2018(E)
ISO 2018
---------------------- Page: 7 ----------------------
SIST EN ISO 8434-1:2018
ISO 8434-1:2018(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2018

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting

on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address

below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2018 – All rights reserved
---------------------- Page: 8 ----------------------
SIST EN ISO 8434-1:2018
ISO 8434-1:2018(E)
Contents Page

Foreword ..........................................................................................................................................................................................................................................v

Introduction ................................................................................................................................................................................................................................vi

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 2

4 Materials ....................................................................................................................................................................................................................... 3

4.1 General ........................................................................................................................................................................................................... 3

4.2 Connector bodies .................................................................................................................................................................................. 4

4.3 Nuts ................................................................................................................................................................................................................... 4

4.4 Cutting rings .............................................................................................................................................................................................. 5

4.5 O-rings ............................................................................................................................................................................................................ 5

5 Pressure/temperature requirements ............................................................................................................................................ 5

6 Designation of connectors .......................................................................................................................................................................... 9

7 Requirements for tubes .............................................................................................................................................................................12

8 Across‑flats dimensions and tolerances ...................................................................................................................................12

9 Design ...........................................................................................................................................................................................................................12

9.1 Connectors ...............................................................................................................................................................................................12

9.2 Dimensions ..............................................................................................................................................................................................12

9.3 Passage tolerances ............................................................................................................................................................................13

9.4 Angular tolerances ............................................................................................................................................................................13

9.5 Contour details .....................................................................................................................................................................................13

9.6 Ports and stud ends .........................................................................................................................................................................13

9.7 Stud end sealing ..................................................................................................................................................................................13

10 Screw threads .......................................................................................................................................................................................................13

10.1 Cone ends and nuts ..........................................................................................................................................................................13

10.2 Stud ends (connection ends) ...................................................................................................................................................13

11 Manufacture ...........................................................................................................................................................................................................13

11.1 Construction ...........................................................................................................................................................................................13

11.2 Workmanship ........................................................................................................................................................................................14

11.3 Finish ............................................................................................................................................................................................................14

11.4 Corners .......................................................................................................................................................................................................14

12 Assembly instruction ....................................................................................................................................................................................14

13 Procurement information ........................................................................................................................................................................15

14 Marking of components .............................................................................................................................................................................15

15 Performance and qualification test ...............................................................................................................................................15

15.1 General ........................................................................................................................................................................................................15

15.2 Repeated assembly test ................................................................................................................................................................15

15.3 Proof test ...................................................................................................................................................................................................15

15.4 Burst pressure test ...........................................................................................................................................................................15

15.5 Cyclic endurance (impulse) test ............................................................................................................................................15

15.6 Vibration test .........................................................................................................................................................................................15

15.7 Leakage (gas) test ..............................................................................................................................................................................16

15.8 Overtightening test ...........................................................................................................................................................................16

15.8.1 Connectors with cutting rings ...........................................................................................................................16

15.8.2 Connectors with O-ring seal cone (DKO) .................................................................................................16

15.9 Vacuum test .............................................................................................................................................................................................16

16 Identification statement (reference to this document) ............................................................................................16

© ISO 2018 – All rights reserved iii
---------------------- Page: 9 ----------------------
SIST EN ISO 8434-1:2018
ISO 8434-1:2018(E)

Annex A (normative) Assembly instructions for 24° cone connectors using cutting ring

conforming to ISO 8434‑1 ........................................................................................................................................................................45

Bibliography .............................................................................................................................................................................................................................51

iv © ISO 2018 – All rights reserved
---------------------- Page: 10 ----------------------
SIST EN ISO 8434-1:2018
ISO 8434-1:2018(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www .iso .org/patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to the

World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following

URL: www .iso .org/iso/foreword .html.

This document was prepared by Technical Committee ISO/TC 131, Fluid power systems, Subcommittee

SC 4, Connectors and similar products and components.

This third edition cancels and replaces the second edition (ISO 8434-1:2007), which has been technically

revised.
A list of all the parts in the ISO 8434 series, can be found on the ISO website.

This corrected version of ISO 8434-1:2018 incorporates the following corrections:

— Table 4: missing data in the Thread column of Series L and S has been inserted.

— Table 21: missing data in the s column of Series L and S has been inserted.
© ISO 2018 – All rights reserved v
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SIST EN ISO 8434-1:2018
ISO 8434-1:2018(E)
Introduction

In fluid power systems, power is transmitted and controlled through a fluid (liquid or gas) under

pressure within an enclosed circuit. In general applications, a fluid may be conveyed under pressure.

Components may be connected through their ports by connections (connectors) and conductors (tubes

and hoses). Tubes are rigid conductors; hoses are flexible conductors.
vi © ISO 2018 – All rights reserved
---------------------- Page: 12 ----------------------
SIST EN ISO 8434-1:2018
INTERNATIONAL STANDARD ISO 8434-1:2018(E)
Metallic tube connections for fluid power and general use —
Part 1:
24° cone connectors
1 Scope

This document specifies the general and dimensional requirements for 24° cone connectors using

cutting ring and O-ring seal cone (referred to as DKO) suitable for use with ferrous and non-ferrous

tubes with outside diameters from 4 mm to 42 mm inclusive. These connectors are for use in fluid power

and general applications within the limits of pressure and temperature specified in this document.

They are intended for the connection of plain end tubes and hose fittings to ports in accordance with

ISO 6149-1, ISO 1179-1 and ISO 9974-1. (See ISO 12151-2 for a related hose fitting specification.)

These connectors provide full-flow connections in hydraulic systems operating to the working

pressures shown in Table 1. Because many factors influence the pressure at which a system performs

satisfactorily, these values are not intended to be understood as guaranteed minimums. For every

application, sufficient testing is meant to be conducted and reviewed by both the user and manufacturer

to ensure that required performance levels are met.

NOTE 1 For new designs in hydraulic fluid power applications, see the requirements given in 9.6. Where

the requirements of the application allow for the use of elastomeric seals, connector designs that conform to

International Standards and incorporate elastomeric sealing are preferred.

NOTE 2 For use under conditions outside the pressure and/or temperature limits specified, see 5.4.

This document also specifies a performance and qualification test for these connectors.

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.

ISO 48, Rubber, vulcanized or thermoplastic — Determination of hardness (hardness between 10 IRHD and

100 IRHD)

ISO 228-1, Pipe threads where pressure-tight joints are not made on the threads — Part 1: Dimensions,

tolerances and designation
ISO 724, ISO general-purpose metric screw threads — Basic dimensions

ISO 965-1, ISO general purpose metric screw threads — Tolerances — Part 1: Principles and basic data

ISO 1127, Stainless steel tubes — Dimensions, tolerances and conventional masses per unit length

ISO 1179-1, Connections for general use and fluid power — Ports and stud ends with ISO 228-1 threads with

elastomeric or metal-to-metal sealing — Part 1: Threaded ports

ISO 1179-2, Connections for general use and fluid power — Ports and stud ends with ISO 228-1 threads with

elastomeric or metal-to-metal sealing — Part 2: Heavy-duty (S series) and light-duty (L series) stud ends

with elastomeric sealing (type E)
© ISO 2018 – All rights reserved 1
---------------------- Page: 13 ----------------------
SIST EN ISO 8434-1:2018
ISO 8434-1:2018(E)

ISO 1179-4, Connections for general use and fluid power — Ports and stud ends with ISO 228-1 threads

with elastomeric or metal-to-metal sealing — Part 4: Stud ends for general use only with metal-to-metal

sealing (type B)

ISO 3304, Plain end seamless precision steel tubes — Technical conditions for delivery

ISO 3305, Plain end welded precision steel tubes — Technical conditions for delivery

ISO 3601-3, Fluid power systems — O-rings — Part 3: Quality acceptance criteria

ISO 4759-1:2000, Tolerances for fasteners — Part 1: Bolts, screws, studs and nuts — Product grades A, B and C

ISO 5598:2008, Fluid power systems and components — Vocabulary

ISO 6149-1, Connections for hydraulic fluid power and general use — Ports and stud ends with ISO 261

metric threads and O-ring sealing — Part 1: Ports with truncated housing for O-ring seal

ISO 6149-2, Connections for hydraulic fluid power and general use — Ports and stud ends with ISO 261

metric threads and O-ring sealing — Part 2: Dimensions, design, test methods and requirements for heavy-

duty (S series) stud ends

ISO 6149-3, Connections for hydraulic fluid power and general use — Ports and stud ends with ISO 261

metric threads and O-ring sealing — Part 3: Dimensions, design, test methods and requirements for light-

duty (L series) stud ends
ISO 9227, Corrosion tests in artificial atmospheres — Salt spray tests

ISO 9974-1, Connections for general use and fluid power — Ports and stud ends with ISO 261 threads with

elastomeric or metal-to-metal sealing — Part 1: Threaded ports

ISO 9974-2, Connections for general use and fluid power — Ports and stud ends with ISO 261 threads with

elastomeric or metal-to-metal sealing — Part 2: Stud ends with elastomeric sealing (type E)

ISO 9974-3, Connections for general use and fluid power — Ports and stud ends with ISO 261 threads with

elastomeric or metal-to-metal sealing — Part 3: Stud ends with metal-to-metal sealing (type B)

ISO 19879, Metallic tube connections for fluid power and general use — Test methods for hydraulic fluid

power connections
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 5598 and the following apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— IEC Electropedia: available at http: //www .electropedia .org/
— ISO Online browsing platform: available at http: //www .iso .org/obp
3.1
connector
device that connects tubes, hoses or pipes to each other or to components
[SOURCE: ISO 5598:2008, 3.2.122]
3.2
connection
assembly of parts belonging to piping
3.3
fastening thread
terminal thread of a complete connector
2 © ISO 2018 – All rights reserved
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SIST EN ISO 8434-1:2018
ISO 8434-1:2018(E)
3.4
run
two principal, axially aligned outlets of a tee connector or cross connector
[SOURCE: ISO 5598:2008, 3.2.632]
3.5
branch
side outlet(s) of a tee connector or cross connector
[SOURCE: ISO 5598:2008, 3.2.81]
3.6
chamfer

removal of a conical portion at the entrance of a thread, used to assist assembly and prevent damage to

the start of the thread
3.7
face‑to‑face dimension

distance between the two parallel faces of axially aligned outlets of a connector

3.8
face‑to‑centre dimension

distance from the face of an outlet to the central axis of an angularly disposed outlet

3.9
assembly torque
torque required to achieve a satisfactory final connection
[SOURCE: ISO 5598:2008, 3.2.46]
3.10
maximum working pressure

highest pressure at which a system or sub-system is intended to operate in steady-state operating

conditions

Note 1 to entry: For components and piping see also related term “rated pressure”.

[SOURCE: ISO 5598:2008, 3.2.429, modified — NOTE 2 deleted.]
4 Materials
4.1 General

Figures 1 and 2 show the cross-sections and component parts of typical 24° cone connectors.

© ISO 2018 – All rights reserved 3
---------------------- Page: 15 ----------------------
SIST EN ISO 8434-1:2018
ISO 8434-1:2018(E)
Key
1 body
2 nut
3 cutting ring
Figure 1 — Cross‑section of typical 24° cone connector with cutting ring
Key
1 body
2 nut
3 DKO-end (including O-ring)

Figure 2 — Cross‑section of typical 24° cone connector with O‑ring seal cone (DKO) end

4.2 Connector bodies

Bodies shall be manufactured from carbon steel that will provide the minimum pressure/temperature

requirements specified in Clause 5. They shall have characteristics that make them suitable for use

with the fluid to be conveyed and that will provide an effective joint. Weld connector types and weld-on

nipples shall be made of materials classified as suitable for welding.

For bodies manufactured from stainless steel and copper alloys, the pressure/temperature ratings

need to be defined by the manufacturer.
4.3 Nuts

Nuts to be used with carbon steel bodies shall be made of carbon steel, and those for use with stainless

steel bodies shall be made of stainless steel, unless otherwise specified. Nuts to be used with copper

alloy bodies shall be made of a material similar to the bodies.
4 © ISO 2018 – All rights reserved
---------------------- Page: 16 ----------------------
SIST EN ISO 8434-1:2018
ISO 8434-1:2018(E)
4.4 Cutting rings

4.4.1 The ring material shall be compatible with the fluid to be conveyed and provide an effective joint.

4.4.2 Steel cutting rings are to be used in combination with other steel connector components and

steel tubes.

4.4.3 Stainless steel cutting rings are to be used in combination with other stainless steel connector

components and stainless steel tubes.

4.4.4 Brass cutting rings are to be used in combination with other brass connector components and

copper tubes.

4.4.5 Other combinations of materials shall be agreed upon between the purchaser and supplier.

4.5 O‑rings

Unless otherwise specified, for use with petroleum-based hydraulic fluids at the pressure and

temperature requirements given in Clause 5 and Table 1, O-rings for use with connectors in accordance

with this document shall be made of acrylonitrile-butadiene rubber (NBR) with a hardness of

(90 ± 5) IRHD, measured in accordance with ISO 48, and shall conform to the dimensions given in

Table 7 and shall meet or exceed the O-ring quality acceptance criteria of ISO 3601-3, grade N. In those

cases where the pressure and temperature requirements of this document and/or the hydraulic fluid

used in the system differ from those specified in Clause 5 and Table 1, the connector manufacturer shall

be consulted to ensure that an appropriate O-ring material is selected.
5 Pressure/temperature requirements
5.1 Connectors in conformance with this
...

SLOVENSKI STANDARD
SIST EN ISO 8434-1:2018
01-november-2018
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SIST EN ISO 8434-1:2007
SIST EN ISO 8434-1:2007/AC:2009
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Metallic tube connections for fluid power and general use - Part 1: 24° cone connectors

(ISO 8434-1:2018)

Metallische Rohrverschraubungen für Fluidtechnik und allgemeine Anwendung - Teil 1:

Verschraubungen mit 24°-Konus (ISO 8434-1:2018)

Raccordements de tubes métalliques pour transmissions hydrauliques et pneumatiques

et applications générales - Partie 1: Raccords coniques à 24 degrés (ISO 8434-1:2018)

Ta slovenski standard je istoveten z: EN ISO 8434-1:2018
ICS:
23.100.40 Cevna napeljava in sklopke Piping and couplings
SIST EN ISO 8434-1:2018 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN ISO 8434-1:2018
---------------------- Page: 2 ----------------------
SIST EN ISO 8434-1:2018
EN ISO 8434-1
EUROPEAN STANDARD
NORME EUROPÉENNE
August 2018
EUROPÄISCHE NORM
ICS 23.100.40 Supersedes EN ISO 8434-1:2007
English Version
Metallic tube connections for fluid power and general use -
Part 1: 24° cone connectors (ISO 8434-1:2018)

Raccordements de tubes métalliques pour Metallische Rohrverschraubungen für Fluidtechnik

transmissions hydrauliques et pneumatiques et und allgemeine Anwendung - Teil 1: Verschraubungen

applications générales - Partie 1: Raccords coniques à mit 24°-Konus (ISO 8434-1:2018)

24° (ISO 8434-1:2018)
This European Standard was approved by CEN on 4 July 2018.

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 ISO 8434-1:2018 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN ISO 8434-1:2018
EN ISO 8434-1:2018 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

---------------------- Page: 4 ----------------------
SIST EN ISO 8434-1:2018
EN ISO 8434-1:2018 (E)
European foreword

This document (EN ISO 8434-1:2018) has been prepared by Technical Committee ISO/TC 131 "Fluid

power systems" in collaboration with Technical Committee ECISS/TC 110 “Steel tubes, and iron and

steel fittings” the secretariat of which is held by UNI.

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.

This document supersedes EN ISO 8434-1:2007.

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.
Endorsement notice

The text of ISO 8434-1:2018 has been approved by CEN as EN ISO 8434-1:2018 without any

modification.
---------------------- Page: 5 ----------------------
SIST EN ISO 8434-1:2018
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SIST EN ISO 8434-1:2018
INTERNATIONAL ISO
STANDARD 8434-1
Third edition
2018-07
Metallic tube connections for fluid
power and general use —
Part 1:
24° cone connectors
Raccordements de tubes métalliques pour transmissions hydrauliques
et pneumatiques et applications générales —
Partie 1: Raccords coniques à 24°
Reference number
ISO 8434-1:2018(E)
ISO 2018
---------------------- Page: 7 ----------------------
SIST EN ISO 8434-1:2018
ISO 8434-1:2018(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2018

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting

on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address

below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2018 – All rights reserved
---------------------- Page: 8 ----------------------
SIST EN ISO 8434-1:2018
ISO 8434-1:2018(E)
Contents Page

Foreword ..........................................................................................................................................................................................................................................v

Introduction ................................................................................................................................................................................................................................vi

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 2

4 Materials ....................................................................................................................................................................................................................... 3

4.1 General ........................................................................................................................................................................................................... 3

4.2 Connector bodies .................................................................................................................................................................................. 4

4.3 Nuts ................................................................................................................................................................................................................... 4

4.4 Cutting rings .............................................................................................................................................................................................. 5

4.5 O-rings ............................................................................................................................................................................................................ 5

5 Pressure/temperature requirements ............................................................................................................................................ 5

6 Designation of connectors .......................................................................................................................................................................... 9

7 Requirements for tubes .............................................................................................................................................................................12

8 Across‑flats dimensions and tolerances ...................................................................................................................................12

9 Design ...........................................................................................................................................................................................................................12

9.1 Connectors ...............................................................................................................................................................................................12

9.2 Dimensions ..............................................................................................................................................................................................12

9.3 Passage tolerances ............................................................................................................................................................................13

9.4 Angular tolerances ............................................................................................................................................................................13

9.5 Contour details .....................................................................................................................................................................................13

9.6 Ports and stud ends .........................................................................................................................................................................13

9.7 Stud end sealing ..................................................................................................................................................................................13

10 Screw threads .......................................................................................................................................................................................................13

10.1 Cone ends and nuts ..........................................................................................................................................................................13

10.2 Stud ends (connection ends) ...................................................................................................................................................13

11 Manufacture ...........................................................................................................................................................................................................13

11.1 Construction ...........................................................................................................................................................................................13

11.2 Workmanship ........................................................................................................................................................................................14

11.3 Finish ............................................................................................................................................................................................................14

11.4 Corners .......................................................................................................................................................................................................14

12 Assembly instruction ....................................................................................................................................................................................14

13 Procurement information ........................................................................................................................................................................15

14 Marking of components .............................................................................................................................................................................15

15 Performance and qualification test ...............................................................................................................................................15

15.1 General ........................................................................................................................................................................................................15

15.2 Repeated assembly test ................................................................................................................................................................15

15.3 Proof test ...................................................................................................................................................................................................15

15.4 Burst pressure test ...........................................................................................................................................................................15

15.5 Cyclic endurance (impulse) test ............................................................................................................................................15

15.6 Vibration test .........................................................................................................................................................................................15

15.7 Leakage (gas) test ..............................................................................................................................................................................16

15.8 Overtightening test ...........................................................................................................................................................................16

15.8.1 Connectors with cutting rings ...........................................................................................................................16

15.8.2 Connectors with O-ring seal cone (DKO) .................................................................................................16

15.9 Vacuum test .............................................................................................................................................................................................16

16 Identification statement (reference to this document) ............................................................................................16

© ISO 2018 – All rights reserved iii
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SIST EN ISO 8434-1:2018
ISO 8434-1:2018(E)

Annex A (normative) Assembly instructions for 24° cone connectors using cutting ring

conforming to ISO 8434‑1 ........................................................................................................................................................................45

Bibliography .............................................................................................................................................................................................................................51

iv © ISO 2018 – All rights reserved
---------------------- Page: 10 ----------------------
SIST EN ISO 8434-1:2018
ISO 8434-1:2018(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www .iso .org/patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to the

World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following

URL: www .iso .org/iso/foreword .html.

This document was prepared by Technical Committee ISO/TC 131, Fluid power systems, Subcommittee

SC 4, Connectors and similar products and components.

This third edition cancels and replaces the second edition (ISO 8434-1:2007), which has been technically

revised.
A list of all the parts in the ISO 8434 series, can be found on the ISO website.
© ISO 2018 – All rights reserved v
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SIST EN ISO 8434-1:2018
ISO 8434-1:2018(E)
Introduction

In fluid power systems, power is transmitted and controlled through a fluid (liquid or gas) under

pressure within an enclosed circuit. In general applications, a fluid may be conveyed under pressure.

Components may be connected through their ports by connections (connectors) and conductors (tubes

and hoses). Tubes are rigid conductors; hoses are flexible conductors.
vi © ISO 2018 – All rights reserved
---------------------- Page: 12 ----------------------
SIST EN ISO 8434-1:2018
INTERNATIONAL STANDARD ISO 8434-1:2018(E)
Metallic tube connections for fluid power and general use —
Part 1:
24° cone connectors
1 Scope

This document specifies the general and dimensional requirements for 24° cone connectors using

cutting ring and O-ring seal cone (referred to as DKO) suitable for use with ferrous and non-ferrous

tubes with outside diameters from 4 mm to 42 mm inclusive. These connectors are for use in fluid power

and general applications within the limits of pressure and temperature specified in this document.

They are intended for the connection of plain end tubes and hose fittings to ports in accordance with

ISO 6149-1, ISO 1179-1 and ISO 9974-1. (See ISO 12151-2 for a related hose fitting specification.)

These connectors provide full-flow connections in hydraulic systems operating to the working

pressures shown in Table 1. Because many factors influence the pressure at which a system performs

satisfactorily, these values are not intended to be understood as guaranteed minimums. For every

application, sufficient testing is meant to be conducted and reviewed by both the user and manufacturer

to ensure that required performance levels are met.

NOTE 1 For new designs in hydraulic fluid power applications, see the requirements given in 9.6. Where

the requirements of the application allow for the use of elastomeric seals, connector designs that conform to

International Standards and incorporate elastomeric sealing are preferred.

NOTE 2 For use under conditions outside the pressure and/or temperature limits specified, see 5.4.

This document also specifies a performance and qualification test for these connectors.

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.

ISO 48, Rubber, vulcanized or thermoplastic — Determination of hardness (hardness between 10 IRHD and

100 IRHD)

ISO 228-1, Pipe threads where pressure-tight joints are not made on the threads — Part 1: Dimensions,

tolerances and designation
ISO 724, ISO general-purpose metric screw threads — Basic dimensions

ISO 965-1, ISO general purpose metric screw threads — Tolerances — Part 1: Principles and basic data

ISO 1127, Stainless steel tubes — Dimensions, tolerances and conventional masses per unit length

ISO 1179-1, Connections for general use and fluid power — Ports and stud ends with ISO 228-1 threads with

elastomeric or metal-to-metal sealing — Part 1: Threaded ports

ISO 1179-2, Connections for general use and fluid power — Ports and stud ends with ISO 228-1 threads with

elastomeric or metal-to-metal sealing — Part 2: Heavy-duty (S series) and light-duty (L series) stud ends

with elastomeric sealing (type E)
© ISO 2018 – All rights reserved 1
---------------------- Page: 13 ----------------------
SIST EN ISO 8434-1:2018
ISO 8434-1:2018(E)

ISO 1179-4, Connections for general use and fluid power — Ports and stud ends with ISO 228-1 threads

with elastomeric or metal-to-metal sealing — Part 4: Stud ends for general use only with metal-to-metal

sealing (type B)

ISO 3304, Plain end seamless precision steel tubes — Technical conditions for delivery

ISO 3305, Plain end welded precision steel tubes — Technical conditions for delivery

ISO 3601-3, Fluid power systems — O-rings — Part 3: Quality acceptance criteria

ISO 4759-1:2000, Tolerances for fasteners — Part 1: Bolts, screws, studs and nuts — Product grades A, B and C

ISO 5598:2008, Fluid power systems and components — Vocabulary

ISO 6149-1, Connections for hydraulic fluid power and general use — Ports and stud ends with ISO 261

metric threads and O-ring sealing — Part 1: Ports with truncated housing for O-ring seal

ISO 6149-2, Connections for hydraulic fluid power and general use — Ports and stud ends with ISO 261

metric threads and O-ring sealing — Part 2: Dimensions, design, test methods and requirements for heavy-

duty (S series) stud ends

ISO 6149-3, Connections for hydraulic fluid power and general use — Ports and stud ends with ISO 261

metric threads and O-ring sealing — Part 3: Dimensions, design, test methods and requirements for light-

duty (L series) stud ends
ISO 9227, Corrosion tests in artificial atmospheres — Salt spray tests

ISO 9974-1, Connections for general use and fluid power — Ports and stud ends with ISO 261 threads with

elastomeric or metal-to-metal sealing — Part 1: Threaded ports

ISO 9974-2, Connections for general use and fluid power — Ports and stud ends with ISO 261 threads with

elastomeric or metal-to-metal sealing — Part 2: Stud ends with elastomeric sealing (type E)

ISO 9974-3, Connections for general use and fluid power — Ports and stud ends with ISO 261 threads with

elastomeric or metal-to-metal sealing — Part 3: Stud ends with metal-to-metal sealing (type B)

ISO 19879, Metallic tube connections for fluid power and general use — Test methods for hydraulic fluid

power connections
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 5598 and the following apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— IEC Electropedia: available at http: //www .electropedia .org/
— ISO Online browsing platform: available at http: //www .iso .org/obp
3.1
connector
device that connects tubes, hoses or pipes to each other or to components
[SOURCE: ISO 5598:2008, 3.2.122]
3.2
connection
assembly of parts belonging to piping
3.3
fastening thread
terminal thread of a complete connector
2 © ISO 2018 – All rights reserved
---------------------- Page: 14 ----------------------
SIST EN ISO 8434-1:2018
ISO 8434-1:2018(E)
3.4
run
two principal, axially aligned outlets of a tee connector or cross connector
[SOURCE: ISO 5598:2008, 3.2.632]
3.5
branch
side outlet(s) of a tee connector or cross connector
[SOURCE: ISO 5598:2008, 3.2.81]
3.6
chamfer

removal of a conical portion at the entrance of a thread, used to assist assembly and prevent damage to

the start of the thread
3.7
face‑to‑face dimension

distance between the two parallel faces of axially aligned outlets of a connector

3.8
face‑to‑centre dimension

distance from the face of an outlet to the central axis of an angularly disposed outlet

3.9
assembly torque
torque required to achieve a satisfactory final connection
[SOURCE: ISO 5598:2008, 3.2.46]
3.10
maximum working pressure

highest pressure at which a system or sub-system is intended to operate in steady-state operating

conditions

Note 1 to entry: For components and piping see also related term “rated pressure”.

[SOURCE: ISO 5598:2008, 3.2.429, modified — NOTE 2 deleted.]
4 Materials
4.1 General

Figures 1 and 2 show the cross-sections and component parts of typical 24° cone connectors.

© ISO 2018 – All rights reserved 3
---------------------- Page: 15 ----------------------
SIST EN ISO 8434-1:2018
ISO 8434-1:2018(E)
Key
1 body
2 nut
3 cutting ring
Figure 1 — Cross‑section of typical 24° cone connector with cutting ring
Key
1 body
2 nut
3 DKO-end (including O-ring)

Figure 2 — Cross‑section of typical 24° cone connector with O‑ring seal cone (DKO) end

4.2 Connector bodies

Bodies shall be manufactured from carbon steel that will provide the minimum pressure/temperature

requirements specified in Clause 5. They shall have characteristics that make them suitable for use

with the fluid to be conveyed and that will provide an effective joint. Weld connector types and weld-on

nipples shall be made of materials classified as suitable for welding.

For bodies manufactured from stainless steel and copper alloys, the pressure/temperature ratings

need to be defined by the manufacturer.
4.3 Nuts

Nuts to be used with carbon steel bodies shall be made of carbon steel, and those for use with stainless

steel bodies shall be made of stainless steel, unless otherwise specified. Nuts to be used with copper

alloy bodies shall be made of a material similar to the bodies.
4 © ISO 2018 – All rights reserved
---------------------- Page: 16 ----------------------
SIST EN ISO 8434-1:2018
ISO 8434-1:2018(E)
4.4 Cutting rings

4.4.1 The ring material shall be compatible with the fluid to be conveyed and provide an effective joint.

4.4.2 Steel cutting rings are to be used in combination with other steel connector components and

steel tubes.

4.4.3 Stainless steel cutting rings are to be used in combination with other stainless steel connector

components and stainless steel tubes.

4.4.4 Brass cutting rings are to be used in combination with other brass connector components and

copper tubes.

4.4.5 Other combinations of materials shall be agreed upon between the purchaser and supplier.

4.5 O‑rings

Unless otherwise specified, for use with petroleum-based hydraulic fluids at the pressure and

temperature requirements given in Clause 5 and Table 1, O-rings for use with connectors in accordance

with this document shall be made of acrylonitrile-butadiene rubber (NBR) with a hardness of

(90 ± 5) IRHD, measured in accordance with ISO 48, and shall conform to the dimensions given in

Table 7 and shall meet or exceed the O-ring quality acceptance criteria of ISO 3601-3, grade N. In those

cases where the pressure and temperature requirements of this document and/or the hydraulic fluid

used in the system differ from those specified in Clause 5 and Table 1, the connector manufacturer shall

be consulted to ensure that an appropriate O-ring material is selected.
5 Pressure/temperature requirements

5.1 Connectors in conformance with this document made of carbon steel shall meet or exceed

without leakage the requirements from a vacuum of 6,5 kPa (0,065 bar) absolute pressure to the

working pressures given in Tables 1 to 3 when used at temperatures between −40 °C and +120 °C with

petroleum-base hydraulic fluids.

5.2 Connectors conforming to this document can contain elastomeric seals. Unless otherwise

specified, connectors are made and delivered with elastomeric seals for use within the specified working

temperature range with petroleum-base hydraulic fluids. The use of these conn
...

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