SIST ISO 12151-2:2023

Connections for hydraulic fluid power and general use - Hose fittings - Part 2: Hose fittings with ISO 8434-1 24° cone connector ends with O-rings

This document specifies the general and dimensional requirements for the design and performance of hose fittings with 24° cone connector ends with O-rings according to ISO 8434‑1. These hose fittings are made of carbon steel and are intended for use with hoses with nominal inside diameters from 5 mm through 38 mm (inclusive).
NOTE For hose fittings used in hydraulic and pneumatic braking systems on road vehicles, see ISO 4038, ISO 4039‑1 and ISO 4039‑2.
These hose fittings are for use in hydraulic fluid power systems with hoses that meet the requirements of respective hose standards and in general applications with suitable hoses.

Raccordements pour transmissions hydrauliques et applications générales — Flexibles de raccordement — Partie 2: Flexibles avec embouts à cône à 24 degrés et joints toriques conformes à l'ISO 8434-1

Fluidna tehnika - Hidravlika - Spoji za fluidno tehniko in za splošno uporabo - Cevne armature - 2. del: Cevne armature s konusom 24° po ISO 8434-1 in s tesnilkami O

General Information

• Status: Published
• Publication Date: 13-Mar-2023
• ICS: 23.040.70 - Hoses and hose assemblies
• ICS: 23.100.40 - Piping and couplings
• Technical Committee: IHPV - Hydraulics and pneumatics
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 06-Mar-2023
• Due Date: 11-May-2023
• Completion Date: 14-Mar-2023
• Ref Project: ISO 12151-2:2022 - Connections for hydraulic fluid power and general use — Hose fittings — Part 2: Hose fittings with ISO 8434-1 24° cone connector ends with O-rings

Relations

• Revises: SIST ISO 12151-2:2005 - Connections for hydraulic fluid power and general use -- Hose fittings -- Part 2: Hose fittings with ISO 8434-1 and ISO 8434-4 24 degree cone connector ends with O-rings
• Effective Date: 26-Nov-2021

Standards Content (Sample)

SLOVENSKI STANDARD
SIST ISO 12151-2:2023
01-april-2023
Fluidna tehnika - Hidravlika - Spoji za fluidno tehniko in za splošno uporabo -
Cevne armature - 2. del: Cevne armature s konusom 24° po ISO 8434-1 in s
tesnilkami O

Connections for hydraulic fluid power and general use - Hose fittings - Part 2: Hose

fittings with ISO 8434-1 24° cone connector ends with O-rings

Raccordements pour transmissions hydrauliques et applications générales — Flexibles

de raccordement — Partie 2: Flexibles avec embouts à cône à 24 degrés et joints
toriques conformes à l'ISO 8434-1
Ta slovenski standard je istoveten z: ISO 12151-2:2022
ICS:
23.100.40 Cevna napeljava in sklopke Piping and couplings
SIST ISO 12151-2:2023 en,fr,de

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

---------------------- Page: 1 ----------------------
SIST ISO 12151-2:2023
---------------------- Page: 2 ----------------------
SIST ISO 12151-2:2023
INTERNATIONAL ISO
STANDARD 12151-2
Second edition
2022-10
Connections for hydraulic fluid power
and general use — Hose fittings —
Part 2:
Hose fittings with ISO 8434-1 24° cone
connector ends with O-rings
Raccordements pour transmissions hydrauliques et applications
générales — Flexibles de raccordement —
Partie 2: Flexibles avec embouts à cône à 24 degrés et joints toriques
conformes à l'ISO 8434-1
Reference number
ISO 12151-2:2022(E)
© ISO 2022
---------------------- Page: 3 ----------------------
SIST ISO 12151-2:2023
ISO 12151-2:2022(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2022

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: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
© ISO 2022 – All rights reserved
---------------------- Page: 4 ----------------------
SIST ISO 12151-2:2023
ISO 12151-2:2022(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction .................................................................................................................................................................................................................................v

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

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

3 Terms and definitions .................................................................................................................................................................................... 1

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 ............................................................................................................................................................................. 5

Bibliography .............................................................................................................................................................................................................................13

iii
© ISO 2022 – All rights reserved
---------------------- Page: 5 ----------------------
SIST ISO 12151-2:2023
ISO 12151-2:2022(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 of 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

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 second edition cancels and replaces the first edition (ISO 12151-2:2003), which has been technically

revised.
The main changes are as follows:

— all references to ISO 8434-4 have been removed as this International Standard has been withdrawn

and replaced by ISO 8434-1;

— all references to ISO 8434-5 have been removed as this International Standard has been withdrawn

and replaced by ISO 19879.
A list of all parts in the ISO 12151 series can be found on the ISO website.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www.iso.org/members.html.
© ISO 2022 – All rights reserved
---------------------- Page: 6 ----------------------
SIST ISO 12151-2:2023
ISO 12151-2:2022(E)
Introduction

In hydraulic fluid power systems, power is transmitted and controlled through a liquid under pressure

within an enclosed circuit. In general applications, a fluid can 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.
© ISO 2022 – All rights reserved
---------------------- Page: 7 ----------------------
SIST ISO 12151-2:2023
---------------------- Page: 8 ----------------------
SIST ISO 12151-2:2023
INTERNATIONAL STANDARD ISO 12151-2:2022(E)
Connections for hydraulic fluid power and general use —
Hose fittings —
Part 2:
Hose fittings with ISO 8434-1 24° cone connector ends with
O-rings
1 Scope

This document specifies the general and dimensional requirements for the design and performance of

hose fittings with 24° cone connector ends with O-rings according to ISO 8434-1. These hose fittings

are made of carbon steel and are intended for use with hoses with nominal inside diameters from 5 mm

through 38 mm (inclusive).

NOTE For hose fittings used in hydraulic and pneumatic braking systems on road vehicles, see ISO 4038,

ISO 4039-1 and ISO 4039-2.

These hose fittings are for use in hydraulic fluid power systems with hoses that meet the requirements

of respective hose standards and in general applications with suitable hoses.
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 1302, Geometrical Product Specifications (GPS) — Indication of surface texture in technical product

documentation

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

and C
ISO 5598, Fluid power systems and components — Vocabulary

ISO 8434-1, Metallic tube connections for fluid power and general use — Part 1: 24° cone connectors

ISO 9227, Corrosion tests in artificial atmospheres — Salt spray tests
3 Terms and definitions

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

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

— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
© ISO 2022 – All rights reserved
---------------------- Page: 9 ----------------------
SIST ISO 12151-2:2023
ISO 12151-2:2022(E)
4 Performance requirements

4.1 Hose assemblies shall meet the performance requirements specified in the appropriate

hose specification without leakage or failure. Examples for related ISO standards are listed in the

Bibliography.

4.2 The working pressure of the hose assembly shall be the lower of the pressures given for its size in

ISO 8434-1 and in the relevant hose specification.

4.3 The hose-fitting connection end shall meet the performance requirements specified in ISO 8434-1.

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 12151-2", followed by a spaced hyphen, then the connection end type, shape and

style letter symbols (see 5.4), followed by another spaced hyphen and, for the ends, the letter symbol

for the series directly followed by the 24° cone end size (nominal connection size) and the hose size

(nominal hose inside diameter), each separated by a multiplication sign (×).

EXAMPLE A swivel straight light-duty series hose fitting for use with 22 mm OD tubing and 19 mm ID hose is

designated as follows:
ISO 12151-2 - SWS - L22 × 19

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 rigid 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 Shape
Swivel / SW Straight / S
90° elbow / E
45° elbow / E45
Series Symbol
Light-duty L
Heavy-duty S
© ISO 2022 – All rights reserved
---------------------- Page: 10 ----------------------
SIST ISO 12151-2:2023
ISO 12151-2:2022(E)
6 Design

6.1 Figure 1 shows a typical connection with a hose fitting connector in accordance with this

document.
Key
1 hose fitting 4 adapter
2 O-ring seal 5 nut
3 port
Figure 1 — Example of typical ISO 12151-2 hose fitting connection

6.2 Hose fitting dimensions shown in Figures 2 to 5 shall conform to the dimensions in Tables 1 to 4

and to the relevant dimensions in ISO 8434-1.

6.3 Hex tolerances across flats shall be in accordance with ISO 4759-1:2000, product grade C.

Minimum across corner hex dimensions are 1,092 times the nominal width across flats. The minimum

side flat is 0,43 times the nominal width across flats.
6.4 Angular tolerances on axes of ends of elbows shall be ±3° for all sizes.

6.5 Details of contour shall be as chosen by the manufacturer, provided that the dimensions given in

Tables 1 to 4 are maintained.
7 Manufacture
7.1 Construction

Hose fittings may be made by forging or cold forming, machined from bar stock or manufactured

from multiple components. Materials other than carbon steel may be supplied as agreed between the

manufacturer and user.
© ISO 2022 – All rights reserved
---------------------- Page: 11 ----------------------
SIST ISO 12151-2:2023
...

INTERNATIONAL ISO
STANDARD 12151-2
Second edition
2022-10
Connections for hydraulic fluid power
and general use — Hose fittings —
Part 2:
Hose fittings with ISO 8434-1 24° cone
connector ends with O-rings
Raccordements pour transmissions hydrauliques et applications
générales — Flexibles de raccordement —
Partie 2: Flexibles avec embouts à cône à 24 degrés et joints toriques
conformes à l'ISO 8434-1
Reference number
ISO 12151-2:2022(E)
© ISO 2022
---------------------- Page: 1 ----------------------
ISO 12151-2:2022(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2022

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: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
© ISO 2022 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 12151-2:2022(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction .................................................................................................................................................................................................................................v

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

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

3 Terms and definitions .................................................................................................................................................................................... 1

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 ............................................................................................................................................................................. 5

Bibliography .............................................................................................................................................................................................................................13

iii
© ISO 2022 – All rights reserved
---------------------- Page: 3 ----------------------
ISO 12151-2:2022(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 of 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

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 second edition cancels and replaces the first edition (ISO 12151-2:2003), which has been technically

revised.
The main changes are as follows:

— all references to ISO 8434-4 have been removed as this International Standard has been withdrawn

and replaced by ISO 8434-1;

— all references to ISO 8434-5 have been removed as this International Standard has been withdrawn

and replaced by ISO 19879.
A list of all parts in the ISO 12151 series can be found on the ISO website.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www.iso.org/members.html.
© ISO 2022 – All rights reserved
---------------------- Page: 4 ----------------------
ISO 12151-2:2022(E)
Introduction

In hydraulic fluid power systems, power is transmitted and controlled through a liquid under pressure

within an enclosed circuit. In general applications, a fluid can 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.
© ISO 2022 – All rights reserved
---------------------- Page: 5 ----------------------
INTERNATIONAL STANDARD ISO 12151-2:2022(E)
Connections for hydraulic fluid power and general use —
Hose fittings —
Part 2:
Hose fittings with ISO 8434-1 24° cone connector ends with
O-rings
1 Scope

This document specifies the general and dimensional requirements for the design and performance of

hose fittings with 24° cone connector ends with O-rings according to ISO 8434-1. These hose fittings

are made of carbon steel and are intended for use with hoses with nominal inside diameters from 5 mm

through 38 mm (inclusive).

NOTE For hose fittings used in hydraulic and pneumatic braking systems on road vehicles, see ISO 4038,

ISO 4039-1 and ISO 4039-2.

These hose fittings are for use in hydraulic fluid power systems with hoses that meet the requirements

of respective hose standards and in general applications with suitable hoses.
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 1302, Geometrical Product Specifications (GPS) — Indication of surface texture in technical product

documentation

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

and C
ISO 5598, Fluid power systems and components — Vocabulary

ISO 8434-1, Metallic tube connections for fluid power and general use — Part 1: 24° cone connectors

ISO 9227, Corrosion tests in artificial atmospheres — Salt spray tests
3 Terms and definitions

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

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

— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
© ISO 2022 – All rights reserved
---------------------- Page: 6 ----------------------
ISO 12151-2:2022(E)
4 Performance requirements

4.1 Hose assemblies shall meet the performance requirements specified in the appropriate

hose specification without leakage or failure. Examples for related ISO standards are listed in the

Bibliography.

4.2 The working pressure of the hose assembly shall be the lower of the pressures given for its size in

ISO 8434-1 and in the relevant hose specification.

4.3 The hose-fitting connection end shall meet the performance requirements specified in ISO 8434-1.

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 12151-2", followed by a spaced hyphen, then the connection end type, shape and

style letter symbols (see 5.4), followed by another spaced hyphen and, for the ends, the letter symbol

for the series directly followed by the 24° cone end size (nominal connection size) and the hose size

(nominal hose inside diameter), each separated by a multiplication sign (×).

EXAMPLE A swivel straight light-duty series hose fitting for use with 22 mm OD tubing and 19 mm ID hose is

designated as follows:
ISO 12151-2 - SWS - L22 × 19

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 rigid 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 Shape
Swivel / SW Straight / S
90° elbow / E
45° elbow / E45
Series Symbol
Light-duty L
Heavy-duty S
© ISO 2022 – All rights reserved
---------------------- Page: 7 ----------------------
ISO 12151-2:2022(E)
6 Design

6.1 Figure 1 shows a typical connection with a hose fitting connector in accordance with this

document.
Key
1 hose fitting 4 adapter
2 O-ring seal 5 nut
3 port
Figure 1 — Example of typical ISO 12151-2 hose fitting connection

6.2 Hose fitting dimensions shown in Figures 2 to 5 shall conform to the dimensions in Tables 1 to 4

and to the relevant dimensions in ISO 8434-1.

6.3 Hex tolerances across flats shall be in accordance with ISO 4759-1:2000, product grade C.

Minimum across corner hex dimensions are 1,092 times the nominal width across flats. The minimum

side flat is 0,43 times the nominal width across flats.
6.4 Angular tolerances on axes of ends of elbows shall be ±3° for all sizes.

6.5 Details of contour shall be as chosen by the manufacturer, provided that the dimensions given in

Tables 1 to 4 are maintained.
7 Manufacture
7.1 Construction

Hose fittings may be made by forging or cold forming, machined from bar stock or manufactured

from multiple components. Materials other than carbon steel may be supplied as agreed between the

manufacturer and user.
© ISO 2022 – All rights reserved
---------------------- Page: 8 ----------------------
ISO 12151-2:2022(E)
7.2 Workmanship

Workmanship shall conform to the best commercial practice to produce high quality hose fittings.

Hose fittings shall be free from visual contaminants, all hanging burrs, loose scale and slivers that can

be dislodged in use, and any other defects that can affect the functioning of the parts. All machined

surfaces shall have a surface roughness value of ISO 1302-MRR Ramax 6,3 µm, except where otherwise

specified.
7.3 Finish

The external surface and threads of all carbon steel parts should be plated or coated with a suitable

material that passes a 72-h neutral
...

NORME ISO
INTERNATIONALE 12151-2
Deuxième édition
2022-10
Raccordements pour transmissions
hydrauliques et applications
générales — Flexibles de
raccordement —
Partie 2:
Flexibles avec embouts à cône à 24
degrés et joints toriques conformes à
l'ISO 8434-1
Connections for hydraulic fluid power and general use — Hose
fittings —
Part 2: Hose fittings with ISO 8434-1 24° cone connector ends with
O-rings
Numéro de référence
ISO 12151-2:2022(F)
© ISO 2022
---------------------- Page: 1 ----------------------
ISO 12151-2:2022(F)
DOCUMENT PROTÉGÉ PAR COPYRIGHT
© ISO 2022

Tous droits réservés. Sauf prescription différente ou nécessité dans le contexte de sa mise en œuvre, 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, ou la diffusion sur l’internet ou sur un intranet, sans autorisation écrite préalable. Une autorisation peut

être demandée à l’ISO à l’adresse ci-après ou au comité membre de l’ISO dans le pays du demandeur.

ISO copyright office
Case postale 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Genève
Tél.: [phone]
E-mail: [e-mail]
Web: www.iso.org
Publié en Suisse
© ISO 2022 – Tous droits réservés
---------------------- Page: 2 ----------------------
ISO 12151-2:2022(F)
Sommaire Page

Avant-propos .............................................................................................................................................................................................................................iv

Introduction .................................................................................................................................................................................................................................v

1 Domaine d’application ................................................................................................................................................................................... 1

2 Références normatives ..................................................................................................................................................................................1

3 Termes et définitions ...................................................................................................................................................................................... 1

4 Exigences relatives aux performances ......................................................................................................................................... 2

5 Désignation des flexibles de raccordement ............................................................................................................................ 2

6 Conception ..................................................................................................................................................................................................................3

7 Fabrication ................................................................................................................................................................................................................. 3

7.1 Construction ............................................................................................................................................................................................. 3

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 .................................................................................................................................................................................. 5

Bibliographie ...........................................................................................................................................................................................................................13

iii
© ISO 2022 – Tous droits réservés
---------------------- Page: 3 ----------------------
ISO 12151-2:2022(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 procédures utilisées pour élaborer le présent document et celles destinées à sa mise à jour sont

décrites dans les Directives ISO/IEC, Partie 1. Il convient, en particulier, de prendre note des différents

critères d'approbation requis pour les différents types de documents ISO. Le présent document a

été rédigé conformément aux règles de rédaction données dans les Directives ISO/IEC, Partie 2 (voir

www.iso.org/directives).

L'attention est attirée sur le fait que certains des éléments du présent document peuvent faire l'objet de

droits de propriété intellectuelle ou de droits analogues. L'ISO ne saurait être tenue pour responsable

de ne pas avoir identifié de tels droits de propriété et averti de leur existence. Les détails concernant

les références aux droits de propriété intellectuelle ou autres droits analogues identifiés lors de

l'élaboration du document sont indiqués dans l'Introduction et/ou dans la liste des déclarations de

brevets reçues par l'ISO (voir www.iso.org/brevets).

Les appellations commerciales éventuellement mentionnées dans le présent document sont données

pour information, par souci de commodité, à l’intention des utilisateurs et ne sauraient constituer un

engagement.

Pour une explication de la nature volontaire des normes, la signification des termes et expressions

spécifiques de l'ISO liés à l'évaluation de la conformité, ou pour toute information au sujet de l'adhésion

de l'ISO aux principes de l’Organisation mondiale du commerce (OMC) concernant les obstacles

techniques au commerce (OTC), voir www.iso.org/avant-propos.

Le présent document a été élaborée par le comité technique ISO/TC 131, Transmissions hydrauliques et

pneumatiques, sous-comité SC 4, Raccords, produits similaires et leurs composants.

Cette deuxième édition annule et remplace la première édition (ISO 12151-2:2003) qui a fait l’objet

d’une révision technique.
Les principales modifications sont les suivantes:

— suppression de toutes les références à l'ISO 8434-4 qui a été annulée et remplacée par l'ISO 8434-1;

— suppression de toutes les références à l'ISO 8434-5 qui a été annulée et remplacée par l’ISO 19879.

Une liste de toutes les parties de la série ISO 12151 se trouve sur le site web de l’ISO.

Il convient que l’utilisateur adresse tout retour d’information ou toute question concernant le présent

document à l’organisme national de normalisation de son pays. Une liste exhaustive desdits organismes

se trouve à l’adresse www.iso.org/fr/members.html.
© ISO 2022 – Tous droits réservés
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ISO 12151-2:2022(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 fixés sur les embouts des

tubes/tuyauteries rigides ou sur les flexibles de raccordement.
© ISO 2022 – Tous droits réservés
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NORME INTERNATIONALE ISO 12151-2:2022(F)
Raccordements pour transmissions hydrauliques et
applications générales — Flexibles de raccordement —
Partie 2:
Flexibles avec embouts à cône à 24 degrés et joints
toriques conformes à l'ISO 8434-1
1 Domaine d’application

Le présent document spécifie les exigences générales et dimensionnelles pour la conception et les

performances des flexibles de raccordement avec embouts à cône à 24° et joints toriques conformes à

l’ISO 8434-1. Ces flexibles de raccordement sont réalisés en acier au carbone et sont prévus pour être

utilisés avec des tuyaux dont le diamètre intérieur nominal est compris entre 5 mm et 38 mm inclus.

NOTE Pour les flexibles de raccordement utilisés dans les systèmes de freinage hydrauliques et pneumatiques

sur les véhicules routiers, voir l'ISO 4038, l’ISO 4039-1 et l'ISO 4039-2.

Ces flexibles de raccordement sont utilisés dans les systèmes de transmissions hydrauliques avec des

tuyaux flexibles qui répondent aux exigences des normes de tuyaux respectives et dans des applications

générales avec des tuyaux adaptés.
2 Références normatives

Les documents suivants sont cités dans le texte de sorte qu’ils constituent, pour tout ou partie de leur

contenu, des exigences du présent document. Pour les références datées, seule l’édition citée s’applique.

Pour les références non datées, la dernière édition du document de référence s'applique (y compris les

éventuels amendements).

ISO 1302, Spécification géométrique des produits (GPS) — Indication des états de surface dans la

documentation technique de produits

ISO 4759-1:2000, Tolérances des éléments de fixation — Partie 1: Vis, goujons et écrous — Grades A, B et C

ISO 5598, Transmissions hydrauliques et pneumatiques — Vocabulaire

ISO 8434-1, Raccordements de tubes métalliques pour transmissions hydrauliques et pneumatiques et

applications générales — Partie 1: Raccords coniques à 24°

ISO 9227, Essais de corrosion en atmosphères artificielles — Essais aux brouillards salins

3 Termes et définitions

Pour les besoins du présent document, les termes et définitions donnés dans l’ISO 5598 s'appliquent.

L'ISO et l'IEC tiennent à jour des bases de données terminologiques destinées à être utilisées en

normalisation, consultables aux adresses suivantes:

— ISO Online browsing platform: disponible à l'adresse https:// www .iso .org/ obp

— IEC Electropedia: disponible à l'adresse https:// www .electropedia .org/
© ISO 2022 – Tous droits réservés
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ISO 12151-2:2022(F)
4 Exigences relatives aux performances

4.1 Les flexibles de raccordement doivent satisfaire aux exigences de performances spécifiées dans la

spécification appropriée pour les tuyaux flexibles sans présenter de fuite ou de rupture. Des exemples

de normes ISO correspondantes figurent dans la Bibliographie.

4.2 La pression d'utilisation du flexible de raccordement doit être la plus basse des pressions données

pour sa dimension dans l'ISO 8434-1 et dans toute spécification appropriée pour les tuyaux.

4.3 Les extrémités des flexibles de raccordement doivent répondre aux exigences de performance

spécifiées dans l'ISO 8434-1.
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 “ISO 12151-2”, suivi d'un tiret espacé, ensuite des symboles

du type d’extrémité de raccordement et de sa forme (voir 5.4), suivi d’un autre tiret espacé et, pour les

extrémités, du symbole de la série directement suivi de la dimension de l'embout à cône à 24° (dimension

nominale du raccordement) et de la dimension du tuyau flexible (diamètre intérieur nominal), chacune

des dimensions étant séparée par un signe de multiplication (×).

EXEMPLE Un flexible de raccordement droit pivotant de série légère pour utilisation avec un tube de

diamètre extérieur de 22 mm et un tuyau flexible de diamètre intérieur de 19 mm est désigné comme suit:

ISO 12151-2 - SWS - L22 × 19

5.2 La désignation par le symbole du flexible de raccordement doit comporter le type de l'extrémité

de raccordement, immédiatement suivi de la forme de l'embout, et le type de l'écrou, le cas échéant.

5.3 Les extrémités des tubes sont implicites, il n'est donc pas nécessaire de les inclure dans le code.

Par contre, si un autre type d'extrémité est prévu, il doit être désigné.
5.4 Les symboles suivants doivent être utilisés:
Type d'extrémité
Forme
de raccordement
Pivotant / SW Droit / S
Coude à 90° / E
Coude à 45° / E45
Série Symbole
Série légère L
Série lourde S
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ISO 12151-2:2022(F)
6 Conception

6.1 La Figure 1 présente un raccordement typique avec un flexible de raccordement conforme au

présent document.
Légende
1 flexible de raccordement 4 adaptateur
2 joint torique 5 écrou
3 orifice
Figure 1 — Exemple de flexible de raccordement typique ISO 12151-2

6.2 Les dimensions des flexibles de raccordement représentés aux Figures 2 à 5 doivent être

conformes aux dimensions des Tableaux 1 à 4 et aux dimensions appropriées de l'ISO 8434-1.

6.3 Les tolérances des surplats des éléments hexagonaux doivent être conformes à l'ISO 4759-1:2000,

grade C. Les cotes surangles minimales sont de 1,092 fois les cotes nominales des surplats. La largeur

minimale d'un plat est de 0,43 fois la cote nominale des surplats.

6.4 Les tolérances angulaires sur les axes des extrémités des coudes doivent être de ±3° pour toutes

les dimensions.

6.5 Les détails du contour doivent être laissés au choix du fabricant, à condition que les dimensions

données dans les Tableaux 1 à 4 soient respectées.
7 Fabrication
7.1 Construction

Les embouts peuvent être forgés ou façonnés à froid, usinés à partir d'acier laminé ou fabriqués à partir

d'éléments multiples. Des matériaux autres que les aciers au carbone peuvent être utilisés par accord

entre le fabricant et l'utilisateur.
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ISO 12151-2:2022(F)
7.2 Qualité d'exécution

La qualité d'exécution doit être conforme aux meilleures pratiques commerciales pour donner des

flexibles de raccordement de haute qualité. Les flexibles de raccordement doivent être exempts de tout

contaminant visuel, de toute bavure, d'écaille et d'éclat qui peuvent être délogés lors de l'utilis

...