ISO 12151-1:1999

Connections for hydraulic fluid power and general use — Hose fittings — Part 1: Hose fittings with ISO 8434-3 O-ring face seal ends

Raccordements pour transmissions hydrauliques et applications générales — Flexibles de raccordement — Partie 1: Flexibles avec embouts à joints faciaux toriques conformes à l'ISO 8434-3

Fluidna tehnika - Hidravlika - Spoji za hidravliko in za splošno uporabo - Cevne armature - 1. del: Cevne armature s tesnilko O po ISO 8434-3

General Information

• Status: Withdrawn
• Publication Date: 23-Jun-1999
• Withdrawal Date: 23-Jun-1999
• ICS: 23.040.70 - Hoses and hose assemblies
• ICS: 23.100.40 - Piping and couplings
• Technical Committee: ISO/TC 131/SC 4 - Connectors and similar products and components
• Drafting Committee: ISO/TC 131/SC 4/WG 6 - Methods for connecting hose fittings and tubes to connectors
• Current Stage: 9599 - Withdrawal of International Standard
• Completion Date: 07-Jun-2010
• Ref Project: SIST ISO 12151-1:2000 - Connections for hydraulic fluid power and general use -- Hose fittings -- Part 1: Hose fittings with ISO 8434-3 O-ring face seal ends

Relations

• Revised: ISO 12151-1:2010 - Connections for hydraulic fluid power and general use — Hose fittings — Part 1: Hose fittings with ISO 8434-3 O-ring face seal ends
• Effective Date: 15-Apr-2008

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 12151-1
First edition
1999-06-01
Connections for hydraulic fluid power and
general use — Hose fittings —
Part 1:
Hose fittings with ISO 8434-3 O-ring face seal
ends
Raccordements pour transmissions hydrauliques et applications
générales — Flexibles de raccordement —
Partie 1: Flexibles avec embouts à joints faciaux toriques conformes
à l'ISO 8434-3
A
Reference number
ISO 12151-1:1999(E)

---------------------- Page: 1 ----------------------
ISO 12151-1:1999(E)
Contents
1 Scope .1
2 Normative references .2
3 Terms and definitions .2
4 Performance requirements .2
5 Designation of hose fittings .2
6 Design.3
7 Manufacture.3
7.1 Construction.3
7.2 Workmanship .4
7.3 Finish .4
7.4 Fitting protection .4
8 Assembly instructions .4
9 Procurement information.4
10 Marking .5
11 Identification statement (reference to this part of ISO 12151).5
(informative)
Annex A Illustrations of applications for short, medium and long ISO 12151-1 hose fittings.11
Bibliography.12
©  ISO 1999
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic
or mechanical, including photocopying and microfilm, without permission in writing from the publisher.
International Organization for Standardization
Case postale 56 • CH-1211 Genève 20 • Switzerland
Internet [e-mail]
Printed in Switzerland
ii

---------------------- Page: 2 ----------------------
© ISO
ISO 12151-1:1999(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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3.
Draft International Standards adopted by the technical committees are circulated to the member bodies for voting.
Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.
International Standard ISO 12151-1 was prepared by Technical Committee ISO/TC 131, Fluid power systems, Sub-
committee SC 4, Connectors and similar products and components.
ISO 12151 consists of the following parts, under the general title Connections for hydraulic fluid power and general
use — Hose fittings:
 Part 1: Hose fittings with ISO 8434-3 O-ring face seal ends
 Part 2: Hose fittings with ISO 8434-1 and 8434-4 24° cone connector ends with O-rings

Part 3: Hose fittings with ISO 6162 flange ends
 Part 4: Hose fittings with ISO 6149 stud ends
 Part 5: Hose fittings with ISO 8434-2 37° flared ends
Annex A of this part of ISO 12151 is for information only.
iii

---------------------- Page: 3 ----------------------
© ISO
ISO 12151-1:1999(E)
Introduction
In hydraulic fluid power systems, power is transmitted and controlled through a liquid under pressure within an
enclosed circuit. In general applications, the fluid may be conveyed under pressure.
Components are connected through their ports by stud ends on fluid conductor fittings to tubes/pipes or to hose
fittings and hoses.
iv

---------------------- Page: 4 ----------------------
INTERNATIONAL STANDARD  © ISO ISO 12151-1:1999(E)
Connections for hydraulic fluid power and general use — Hose
fittings —
Part 1:
Hose fittings with ISO 8434-3 O-ring face seal ends
1 Scope
This part of ISO 12151 specifies the general and dimensional requirements for the design and performance of hose
fittings with O-ring face seal ends in accordance with ISO 8434-3, made of carbon steel, for nominal hose inside
diameters of 6,3 mm to 38 mm inclusive, in accordance with ISO 4397.
NOTE 1 Materials other than carbon steel may be supplied as agreed between the manufacturer and user.
NOTE 2 For hose fittings used in hydraulic braking systems on road vehicles (as defined in the scope of ISO/TC 22), see
ISO 4038.
These hose fittings (see Figure 1 for a typical example) are for use in hydraulic fluid power systems with hose that
meets the requirements of the respective hose standards and in general applications with suitable hose.
Key
1 Hose fitting 4 Adapter in accordance with ISO 8434-3
2 Port in accordance with ISO 6149-1 5 Nut
3 O-ring seal 6 O-ring seal
Figure 1 — Typical example of hose fitting connection with O-ring face seal fitting end
1

---------------------- Page: 5 ----------------------
© ISO
ISO 12151-1:1999(E)
2 Normative references
The following normative documents contain certain provisions which, through reference in this text, constitute
provisions of this part of ISO 12151. For dated references, subsequent amendments to, or revisions of, any of these
publications do not apply. However, parties to agreements based on this part of ISO 12151 are encouraged to
investigate the possibility of applying the most recent editions of the normative documents indicated below. For
undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC
maintain registers of currently valid International Standards.
ISO 725:1978, ISO inch screw threads — Basic dimensions.
ISO 4397:1993, Fluid power systems and components — Connectors and associated components — Nominal
outside diameters of tubes and nominal inside diameters of hoses.
1)
ISO 4759-1:— , Tolerances for fasteners — Part 1: Bolts, screws, studs and nuts — Product grades A, B and C.
ISO 5598:1985, Fluid power systems and components — Vocabulary.
ISO 5864:1993, ISO inch screw threads — Allowances and tolerances.
2)
ISO 6149-1:— , Connections for fluid power and general use — Ports and stud ends with ISO 261 threads and
O-ring sealing — Part 1: Ports with O-ring seal in truncated housing.
ISO 8434-3:1995, Metallic tube connections for fluid power and general use — Part 3: O-ring face seal fittings
ISO 8434-5:1995, Metallic tube connections for fluid power and general use — Part 5: Test methods for threaded
hydraulic fluid power connections.
ISO 9227:1990, Corrosion tests in artificial atmospheres — Salt spray tests.
3 Terms and definitions
For the purposes of this part of ISO 12151, the terms and definitions given in ISO 5598 apply.
4 Performance requirements
Hose assemblies shall meet the performance requirements specified in the appropriate hose specification without
leakage or failure.
The working pressure of the hose assembly shall be the lower of the pressures given for its size in ISO 8434-3 and
in the relevant hose specification.
Tests on hose fittings shall be conducted in accordance with ISO 8434-5 for the working pressure of the hose
assembly. The hose assembly shall undergo a cyclic endurance test and meet or exceed the number of cycles
specified in the relevant hose specification.
5 Designation of hose fittings
5.1  Hose fittings shall be designated by an alphanumeric code to facilitate ordering. They shall be designated by
ISO 12151-1, followed by a spaced hyphen, then the connection end type, shape and style letter symbols (see 5.4),
followed by another spaced hyphen, the O-ring face seal end size (nominal tube outside diameter in accordance

1) To be published. (Revision of ISO 4759-1:1978)
2) To be published. (Revision of ISO 6149-1:1993)
2

---------------------- Page: 6 ----------------------
© ISO
ISO 12151-1:1999(E)
with ISO 8434-3) and the hose size (nominal hose inside diameter in accordance with ISO 4397), each separated
by a multiplication symbol (´).
EXAMPLE A swivel fitting with a 45° elbow, for 12 mm nominal OD tubing and 12,5 mm nominal ID hose is designated as
follows:
ISO 12151-1 - SWE45 - 12 3 12,5
5.2  The letter symbol designation of the hose fitting shall consist of the connection end type, immediately followed
by the shape of the fitting and the nut style, where applicable.
5.3  Tube ends are assumed to be male and thus do not need to be included in the code. However, if another end
is involved, it shall be designated.
5.4  The following letter symbols shall be used:
Connection end type Symbol
Swivel SW
Shape
Straight S
o
90 elbow, short ES
o
90 elbow, medium EM
o
90 elbow, long EL
o
45 elbow E45
Sealing surface
Sealing surface not exposed A
Sealing surface exposed B
6 Design
6.1  Hose fitting dimensions shown in Figures 2 through 5 shall conform to those given in Tables 1 to 4 and to the
relevant dimensions in ISO 8434-3.
6.2  Hexagonal tolerances across flats shall be in accordance with ISO 4759-1:—, grade C. Minimum across-
corner hexagonal dimensions are 1,092 times the nominal width across flats. The minimum side flat is 0,43 times
the nominal width across flats.
6.3  Angular tolerances on axes of ends of elbows shall be – 3° for all sizes.
6.4  Details of contour shall be as chosen by the manufacturer, provided that the dimensions given in Tables 1 to 4
are maintained.
6.5  The screw threads on the connection ends of the hose fittings
...

SLOVENSKI STANDARD
SIST ISO 12151-1:2000
01-september-2000
Fluidna tehnika - Hidravlika - Spoji za hidravliko in za splošno uporabo - Cevne
armature - 1. del: Cevne armature s tesnilko O po ISO 8434-3
Connections for hydraulic fluid power and general use -- Hose fittings -- Part 1: Hose
fittings with ISO 8434-3 O-ring face seal ends
Raccordements pour transmissions hydrauliques et applications générales -- Flexibles
de raccordement -- Partie 1: Flexibles avec embouts à joints faciaux toriques conformes
à l'ISO 8434-3
Ta slovenski standard je istoveten z: ISO 12151-1:1999
ICS:
23.100.40 Cevna napeljava in sklopke Piping and couplings
SIST ISO 12151-1:2000 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------

SIST ISO 12151-1:2000

---------------------- Page: 2 ----------------------

SIST ISO 12151-1:2000
INTERNATIONAL ISO
STANDARD 12151-1
First edition
1999-06-01
Connections for hydraulic fluid power and
general use — Hose fittings —
Part 1:
Hose fittings with ISO 8434-3 O-ring face seal
ends
Raccordements pour transmissions hydrauliques et applications
générales — Flexibles de raccordement —
Partie 1: Flexibles avec embouts à joints faciaux toriques conformes
à l'ISO 8434-3
A
Reference number
ISO 12151-1:1999(E)

---------------------- Page: 3 ----------------------

SIST ISO 12151-1:2000
ISO 12151-1:1999(E)
Contents
1 Scope .1
2 Normative references .2
3 Terms and definitions .2
4 Performance requirements .2
5 Designation of hose fittings .2
6 Design.3
7 Manufacture.3
7.1 Construction.3
7.2 Workmanship .4
7.3 Finish .4
7.4 Fitting protection .4
8 Assembly instructions .4
9 Procurement information.4
10 Marking .5
11 Identification statement (reference to this part of ISO 12151).5
(informative)
Annex A Illustrations of applications for short, medium and long ISO 12151-1 hose fittings.11
Bibliography.12
©  ISO 1999
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic
or mechanical, including photocopying and microfilm, without permission in writing from the publisher.
International Organization for Standardization
Case postale 56 • CH-1211 Genève 20 • Switzerland
Internet [e-mail]
Printed in Switzerland
ii

---------------------- Page: 4 ----------------------

SIST ISO 12151-1:2000
© ISO
ISO 12151-1:1999(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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3.
Draft International Standards adopted by the technical committees are circulated to the member bodies for voting.
Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.
International Standard ISO 12151-1 was prepared by Technical Committee ISO/TC 131, Fluid power systems, Sub-
committee SC 4, Connectors and similar products and components.
ISO 12151 consists of the following parts, under the general title Connections for hydraulic fluid power and general
use — Hose fittings:
 Part 1: Hose fittings with ISO 8434-3 O-ring face seal ends
 Part 2: Hose fittings with ISO 8434-1 and 8434-4 24° cone connector ends with O-rings

Part 3: Hose fittings with ISO 6162 flange ends
 Part 4: Hose fittings with ISO 6149 stud ends
 Part 5: Hose fittings with ISO 8434-2 37° flared ends
Annex A of this part of ISO 12151 is for information only.
iii

---------------------- Page: 5 ----------------------

SIST ISO 12151-1:2000
© ISO
ISO 12151-1:1999(E)
Introduction
In hydraulic fluid power systems, power is transmitted and controlled through a liquid under pressure within an
enclosed circuit. In general applications, the fluid may be conveyed under pressure.
Components are connected through their ports by stud ends on fluid conductor fittings to tubes/pipes or to hose
fittings and hoses.
iv

---------------------- Page: 6 ----------------------

SIST ISO 12151-1:2000
INTERNATIONAL STANDARD  © ISO ISO 12151-1:1999(E)
Connections for hydraulic fluid power and general use — Hose
fittings —
Part 1:
Hose fittings with ISO 8434-3 O-ring face seal ends
1 Scope
This part of ISO 12151 specifies the general and dimensional requirements for the design and performance of hose
fittings with O-ring face seal ends in accordance with ISO 8434-3, made of carbon steel, for nominal hose inside
diameters of 6,3 mm to 38 mm inclusive, in accordance with ISO 4397.
NOTE 1 Materials other than carbon steel may be supplied as agreed between the manufacturer and user.
NOTE 2 For hose fittings used in hydraulic braking systems on road vehicles (as defined in the scope of ISO/TC 22), see
ISO 4038.
These hose fittings (see Figure 1 for a typical example) are for use in hydraulic fluid power systems with hose that
meets the requirements of the respective hose standards and in general applications with suitable hose.
Key
1 Hose fitting 4 Adapter in accordance with ISO 8434-3
2 Port in accordance with ISO 6149-1 5 Nut
3 O-ring seal 6 O-ring seal
Figure 1 — Typical example of hose fitting connection with O-ring face seal fitting end
1

---------------------- Page: 7 ----------------------

SIST ISO 12151-1:2000
© ISO
ISO 12151-1:1999(E)
2 Normative references
The following normative documents contain certain provisions which, through reference in this text, constitute
provisions of this part of ISO 12151. For dated references, subsequent amendments to, or revisions of, any of these
publications do not apply. However, parties to agreements based on this part of ISO 12151 are encouraged to
investigate the possibility of applying the most recent editions of the normative documents indicated below. For
undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC
maintain registers of currently valid International Standards.
ISO 725:1978, ISO inch screw threads — Basic dimensions.
ISO 4397:1993, Fluid power systems and components — Connectors and associated components — Nominal
outside diameters of tubes and nominal inside diameters of hoses.
1)
ISO 4759-1:— , Tolerances for fasteners — Part 1: Bolts, screws, studs and nuts — Product grades A, B and C.
ISO 5598:1985, Fluid power systems and components — Vocabulary.
ISO 5864:1993, ISO inch screw threads — Allowances and tolerances.
2)
ISO 6149-1:— , Connections for fluid power and general use — Ports and stud ends with ISO 261 threads and
O-ring sealing — Part 1: Ports with O-ring seal in truncated housing.
ISO 8434-3:1995, Metallic tube connections for fluid power and general use — Part 3: O-ring face seal fittings
ISO 8434-5:1995, Metallic tube connections for fluid power and general use — Part 5: Test methods for threaded
hydraulic fluid power connections.
ISO 9227:1990, Corrosion tests in artificial atmospheres — Salt spray tests.
3 Terms and definitions
For the purposes of this part of ISO 12151, the terms and definitions given in ISO 5598 apply.
4 Performance requirements
Hose assemblies shall meet the performance requirements specified in the appropriate hose specification without
leakage or failure.
The working pressure of the hose assembly shall be the lower of the pressures given for its size in ISO 8434-3 and
in the relevant hose specification.
Tests on hose fittings shall be conducted in accordance with ISO 8434-5 for the working pressure of the hose
assembly. The hose assembly shall undergo a cyclic endurance test and meet or exceed the number of cycles
specified in the relevant hose specification.
5 Designation of hose fittings
5.1  Hose fittings shall be designated by an alphanumeric code to facilitate ordering. They shall be designated by
ISO 12151-1, followed by a spaced hyphen, then the connection end type, shape and style letter symbols (see 5.4),
followed by another spaced hyphen, the O-ring face seal end size (nominal tube outside diameter in accordance

1) To be published. (Revision of ISO 4759-1:1978)
2) To be published. (Revision of ISO 6149-1:1993)
2

---------------------- Page: 8 ----------------------

SIST ISO 12151-1:2000
© ISO
ISO 12151-1:1999(E)
with ISO 8434-3) and the hose size (nominal hose inside diameter in accordance with ISO 4397), each separated
by a multiplication symbol (´).
EXAMPLE A swivel fitting with a 45° elbow, for 12 mm nominal OD tubing and 12,5 mm nominal ID hose is designated as
follows:
ISO 12151-1 - SWE45 - 12 3 12,5
5.2  The letter symbol designation of the hose fitting shall consist of the connection end type, immediately followed
by the shape of the fitting and the nut style, where applicable.
5.3  Tube ends are assumed to be male and thus do not need to be included in the code. However, if another end
is involved, it shall be designated.
5.4  The following letter symbols shall be used:
Connection end type Symbol
Swivel SW
Shape
Straight S
o
90 elbow, short ES
o
90 elbow, medium EM
o
90 elbow, long EL
o
45 elbow E45
Sealing surface
Sealing surface not exposed A
Sealing surface exposed B
6 Design
6.1  Hose fitting dimensions shown in Figures 2 through 5 shall conform to those given in Tables 1 to 4 and to the
relevant dimensions in ISO 8434-3.
6.2  Hexagonal tolerances across fl
...

NORME ISO
INTERNATIONALE 12151-1
Première édition
1999-06-01
Raccordements pour transmissions
hydrauliques et applications générales —
Flexibles de raccordement —
Partie 1:
Flexibles avec embouts à joints faciaux
toriques conformes à l'ISO 8434-3
Connections for hydraulic fluid power and general use — Hose fittings —
Part 1: Hose fittings with ISO 8434-3 O-ring face seal ends
A
Numéro de référence
ISO 12151-1:1999(F)

---------------------- Page: 1 ----------------------
ISO 12151-1:1999(F)
Sommaire Page
1 Domaine d’application .1
2 Références normatives .2
3 Termes et définitions.2
4 Exigences relatives aux performances.2
5 Désignation des flexibles de raccordement.3
6 Conception .3
7 Fabrication.4
7.1 Construction.4
7.2 Qualité d'exécution.4
7.3 Finition.4
7.4 Protection des embouts.4
8 Instructions de montage .4
9 Informations à fournir à l'achat .5
10 Marquage.5
11 Phrase d'identification (Référence à la présente partie de l'ISO 12151).5
(informative)
Annexe A Illustrations d'applications pour flexibles de raccordement ISO 12151-1
court, moyen et long .11
Bibliographie.12
©  ISO 1999
Droits de reproduction réservés. Sauf prescription différente, aucune partie de cette publication ne peut être reproduite ni utilisée sous quelque
forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie et les microfilms, sans l'accord écrit de l'éditeur.
Organisation internationale de normalisation
Case postale 56 • CH-1211 Genève 20 • Suisse
Internet [e-mail]
Imprimé en Suisse
ii

---------------------- Page: 2 ----------------------
© ISO
ISO 12151-1:1999(F)
Avant-propos
L'ISO (Organisation internationale de normalisation) est une fédération mondiale d'organismes nationaux de
normalisation (comités membres de l'ISO). L'élaboration des Normes internationales est en général confiée aux
comités techniques de l'ISO. Chaque comité membre intéressé par une étude a le droit de faire partie du comité
technique créé à cet effet. Les organisations internationales, gouvernementales et non gouvernementales, en
liaison avec l'ISO, participent également aux travaux. L'ISO collabore étroitement avec la Commission
électrotechnique internationale (CEI) en ce qui concerne la normalisation électrotechnique.
Les Normes internationales sont rédigées conformément aux règles données dans les Directives ISO/CEI, Partie 3.
Les projets de Normes internationales adoptés par les comités techniques sont soumis aux comités membres pour
vote. Leur publication comme Normes internationales requiert l'approbation de 75 % au moins des comités
membres votants.
La Norme internationale ISO 12151-1 a été élaborée par le comité technique ISO/TC 131, Transmissions
hydrauliques et pneumatiques, sous-comité SC 4, Raccords, produits similaires et leurs composants.
L'ISO 12151 comprend les parties suivantes, présentées sous le titre général Raccordements pour transmissions
hydrauliques et applications générales — Flexibles de raccordement:
 Partie 1: Flexibles avec embouts à joints faciaux toriques conformes à l'ISO 8434-3
 Partie 2: Flexibles avec embouts à cône à 24° et joint torique conformes à l'ISO 8434-1 et à l'ISO 8434-4
 Partie 3: Flexibles avec bride conforme à l'ISO 6162
 Partie 4: Flexibles avec éléments mâles métriques conformes à l'ISO 6149
 Partie 5: Flexibles avec embouts évasés à 37° conformes à l'ISO 8434-2
L'annexe A de la présente partie de l'ISO 12151 est donnée uniquement à titre d'information.
iii

---------------------- Page: 3 ----------------------
© ISO
ISO 12151-1:1999(F)
Introduction
Dans les systèmes de transmissions hydrauliques, l'énergie est transmise et commandée par l'intermédiaire d'un
fluide sous pression circulant en circuit fermé. Dans les applications générales, le fluide peut être véhiculé sous
pression.
Les composants sont raccordés par leurs orifices au moyen d'éléments mâles ou adaptateurs fixés sur les embouts
des tubes rigides ou sur les flexibles de raccordement.
iv

---------------------- Page: 4 ----------------------
NORME INTERNATIONALE  © ISO ISO 12151-1:1999(F)
Raccordements pour transmissions hydrauliques et applications
générales — Flexibles de raccordement —
Partie 1:
Flexibles avec embouts à joints faciaux toriques conformes
à l'ISO 8434-3
1 Domaine d’application
La présente partie de l'ISO 12151 spécifie les exigences générales et dimensionnelles pour la conception et les
performances des flexibles de raccordement avec embouts à joints faciaux toriques conformes à l'ISO 8434-3, en
acier au carbone, dont le diamètre intérieur nominal du tuyau flexible est compris entre 6,3 mm et 38 mm inclus
conformément à l'ISO 4397.
NOTE 1 D'autres matériaux peuvent être utilisés après accord entre le fabricant et l'utilisateur.
NOTE 2 Pour les flexibles de raccordement utilisés dans les systèmes de freinage hydrauliques sur les véhicules routiers
(comme défini dans le domaine d'application de l'ISO/TC 22), voir l'ISO 4038.
Ces flexibles de raccordement (voir Figure 1 comme exemple type) sont utilisés dans les transmissions
hydrauliques lorsque les tuyaux flexibles sont conformes aux normes respectives, et pour les applications
générales lorsqu'il s'agit de tuyaux adaptés à tous les types de transmissions.
Légende
1 Flexible de raccordement 4 Adaptateur conforme à l'ISO 8434-3
2 Orifice selon l'ISO 6149-1 5 Écrou
3 Joint torique 6 Joint torique
Figure 1 — Exemple type de flexible de raccordement avec embout à joint facial torique
1

---------------------- Page: 5 ----------------------
© ISO
ISO 12151-1:1999(F)
2 Références normatives
Les documents normatifs suivants contiennent des dispositions qui, par suite de la référence qui y est faite,
constituent des dispositions valables pour la présente partie de l’ISO 12151. Pour les références datées, les
amendements ultérieurs ou les révisions de ces publications ne s'appliquent pas. Toutefois, les parties prenantes
aux accords fondés sur la présente partie de l’ISO 12151 sont invitées à rechercher la possibilité d’appliquer les
éditions les plus récentes des documents normatifs indiqués ci-après. Pour les références non datées, la dernière
édition du document normatif en référence s'applique. Les membres de l’ISO et de la CEI possèdent le registre des
Normes internationales en vigueur.
ISO 725:1978, Filetages ISO en inches — Dimensions de base.
ISO 4397:1993, Transmissions hydrauliques et pneumatiques — Raccords et éléments associés — Diamètres
extérieurs nominaux des tubes et diamètres intérieurs nominaux des tuyaux flexibles.
1)
ISO 4759-1:— , Tolérances des éléments de fixation — Partie 1: Vis, goujons et écrous — Grades A, B et C.
ISO 5598:1985, Transmissions hydrauliques et pneumatiques — Vocabulaire.
ISO 5864:1993, Filetages ISO en inches — Jeux et tolérances.
2)
ISO 6149-1:— , Raccordements pour transmissions hydrauliques et pneumatiques et applications générales —
Orifices et éléments mâles à filetage ISO 261 et joint torique — Partie 1: Orifice à joint torique dans un logement
tronconique.
ISO 8434-3:1995, Raccords de tubes métalliques pour transmissions hydrauliques et pneumatiques et applications
générales — Partie 3: Raccords à joints faciaux toriques.
ISO 8434-5:1995, Raccords de tubes métalliques pour transmissions hydrauliques et pneumatiques et applications
générales — Partie 5: Méthodes d'essai pour raccords filetés pour transmissions hydrauliques.
ISO 9227:1990, Essais de corrosion en atmosphères artificielles — Essais aux brouillards salins.
3 Termes et définitions
Pour les besoins de la présente partie de l'ISO 12151, les termes et définitions donnés dans l'ISO 5598
s'appliquent.
4 Exigences relatives aux performances
Les flexibles de raccordement montés doivent satisfaire aux exigences relatives aux performances fixées dans la
spécification appropriée pour les tuyaux flexibles sans présenter de fuite ou de rupture.
La pression d'utilisation des flexibles de raccordement doit être la plus basse des pressions données pour leur taille
dans l'ISO 8434-3 ou dans toute spécification appropriée pour les tuyaux flexibles.
Les essais sur les flexibles de raccordement doivent être effectués conformément à l'ISO 8434-5 pour la pression
d'utilisation correspondant au type de montage du flexible de raccordement. Le flexible de raccordement doit
résister à l'essai d'endurance cyclique, lequel doit comporter au moins le nombre de cycles prescrit dans les
spécifications appropriées.

1) À publier. (Révision de l’ISO 4759-1:1978)
2) À publier. (Révision de l’ISO 6149-1:1993)
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© ISO
ISO 12151-1:1999(F)
5 Désignation des flexibles de raccordement
5.1  Les flexibles de raccordement doivent être désignés par un code alphanumérique pour faciliter la commande.
Ils doivent être désignés par la référence à la présente partie de l'ISO 12151, c'est-à-dire ISO 12151-1, suivie d'un
trait d'union, des symbole littéraux du type de flexible de raccordement (voir 5.4), d'un autre trait d'union, de la taille
de l'embout à joint facial torique (diamètre extérieur nominal du tube conformément à l'ISO 8434-3) et de la taille du
tuyau flexible (diamètre intérieur nominal conformément à l'ISO 4397), chacun des diamètres étant séparé par un
signe de multiplication (´).
EXEMPLE Un coude à 45° pivotant pour tube rigide de diamètre extérieur nominal 12 mm et tuyau flexible de diamètre
intérieur nominal 12,5 mm est désigné comme suit:
ISO 12151-1 - SWE45 - 12 ´ 12,5
5.2  La désignation par lettres symboles du type de flexible de raccordement doit comporter deux parties: le type
de l'extrémité de raccordement immédiatement suivi de la forme de l'embout et du type de l'écrou, lorsque
applicable.
5.3  Les extrémités mâles des tubes étant implicites, il n'est pas nécessaire de les inclure dans le code. Par contre,
si un autre type d'extrémité est prévu, il faut le désigner.
5.4  Les lettres symboles suivantes doivent être utilisées:
Type d'extrémité Symbole
Pivotant SW
Forme de l'embout Symbole
Droit S
Coude à 90°, court ES
Coude à 90°, moyen EM
Coude à 90°, long EL
Coude à 45° E45
Surface d'étanchéité Symbole
Surface d'étanchéité exposée A
Surface d'étanchéité non exposée B
6 Conception
6.1  Les dimensions des flexibles de raccordement représentés aux Figures 2 à 5 doivent être conformes à celles
données dans les Tableaux 1 à 4 et aux dimensions appropriées données dans l'ISO 8434-3.
6.2  Les tolérances sur les cotes surplats des éléments hexagonaux doivent être conformes à l'ISO 4759-1:—,
grade C. Les cotes surangles minimales sont de 1,092 fois la cote surplats nominale. La largeur minimale d'un plat
est de 0,43 fois la cote surplats.
6.3  La tolérance angulaire sur l'axe des extrémités des coudes doit être de ± 3° pour toutes les tailles.
6.4  Les détails du contour doivent être laissés au choix du fabricant, dans la mesure où les dimensions données
dans les Tableaux 1 à 4
...