ISO/TS 11686:2023

© ISO 2023 – All rights reserved
ISO/DTS 11686:2023(E)
ISO/TC 131/SC 4
Secretariat: ANSI
Date: 2023-02-27
Connectors for fluid power and general use –— Assembly instructions for connectors
with adjustable stud ends and O-ring sealing
Élément introductif — Élément principal — Partie n: Titre de la partie
Document type: International standard
Document subtype: if applicable
Document stage: (00) Preliminary
Document language: E

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© ISO 2023 – All rights reserved
Second edition
Date: 2023-04-27

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ISO/DTS 11686:2023(E)
© ISO 2023 , Published in Switzerland
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’sISO's member body
in the country of the requester.
ISO Copyright Office
Ch. de Blandonnet • 8 CP 401 • CH-1214 Vernier, Geneva
Phone: + 41 22 749 01 11
Email: copyright@iso.orgcopyright@iso.org

Website: www.iso.org
Published in Switzerland.
© ISO 2023 – All rights reserved iii

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ISO/DTS 11686:2023 (E)
Contents Page
Foreword . 5
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Instructions for the assembly of connectors with adjustable stud ends and O-ring
sealing . 2
4.1 Preparation prior to assembly . 2
4.2 Assembly . 3
4.2.1 Illustration . 3
4.2.2 Location of O-ring (Position 1 in Figure 1) . 3
4.2.3 Positioning of locknut (Position 2 in Figure 1) . 3
4.2.4 Installation of connector into the port (Position 3 in Figure 1) . 3
4.2.5 Connector adjustment (Position 4 in Figure 1) . 4
4.2.6 Final tightening (Position 5 in Figure 1) . 4
4.2.7 Final inspection . 4
Annex A (informative) Identification of ports, stud ends and plugs and potential for
incompatible intermixing . 6
Bibliography . 16

iv © ISO 2023 – All rights reserved

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ISO/DTS 11686:2023(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 documentsdocument 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 drawnISO draws attention to the possibility that some of the elementsimplementation of
this document may beinvolve the subjectuse of (a) patent(s). ISO takes no position concerning the
evidence, validity or applicability of any claimed patent rights in respect thereof. As of the date of
publication of this document, ISO had not received notice of (a) patent(s) which may be required to
implement this document. However, implementers are cautioned that this may not represent the latest
information, which may be obtained from the patent database available at www.iso.org/patents. 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 ).
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/TS 11686:2017), which has been
technically revised.
The main changes compared to the previous edition are as follows:
— Figure 1 was changed to Table 1 and Figure 2 was changed to Figure 1.
— Table 1 washas been completely redrawn and Positions 4 and 5 werehave been corrected to
accurately reflect the position of the washer, nut, O-ring and body.
— Table Figure 1 Position 3 and Figure 1 2 have been redrawn to remove horizontal line in the
flowpath.
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 2023 – All rights reserved v

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ISO/DTS 11686:2023 (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 2023 – All rights reserved

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TECHNICAL SPECIFICATION ISO/DTS 11686:2023(E)

Connectors for fluid power and general use — Assembly
instructions for connectors with adjustable stud ends and O--ring
sealing
1 1 Scope
This document provides common installation instructions for all connectors that have adjustable stud
ends and O-ring sealing. Conformance with the requirements of this document will result in a
considerable reduction of leaks in hydraulic systems.
2 2 Normative references
The following referenced documents are indispensable forreferred to in the applicationtext 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 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 1179-3, Connections for general use and fluid power – Ports and stud ends with ISO 228-1 threads
with elastomeric or metal-to-metal sealing – Part 3: Light-duty (L series) stud ends with sealing by O-ring
with retaining ring (types G and H)
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 5598, 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 6149-4, Connections for hydraulic fluid power and general use – Ports and stud ends with ISO 261
metric threads and O-ring sealing – Part 4: Dimensions, design, test methods and requirements for external
hex and internal hex port plugs
© ISO 2023 – All rights reserved 1

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ISO/DTS 11686:2023(E)
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 9974-4, Connections for general use and fluid power – Ports and stud ends with ISO 261 threads with
elastomeric or metal-to-metal sealing – Part 4: Dimensions, design, test methods and requirements for
external hex and internal hex port plugs
ISO 11926-1, Connections for general use and fluid power – Ports and stud ends with ISO 725 threads and
O-ring sealing – Part 1: Ports with O-ring seal in truncated housing
ISO 11926-2, Connections for general use and fluid power – Ports and stud ends with ISO 725 threads and
O-ring sealing – Part 2: Heavy-duty (S series) stud ends
ISO 11926-3, Connections for general use and fluid power – Ports and stud ends with ISO 725 threads and
O-ring sealing – Part 3: Light-duty (L series) stud ends
ISO 11926-4, Connections for general use and fluid power – Ports and stud ends with ISO 725 threads and
O-ring sealing – Part 4: Dimensions, design, test methods and requirements for hexagon head screw port
plugs and hexagon socket screw port plugs
153 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/obp4
— IEC Electropedia: available at https://www.electropedia.org/
164 Instructions for the assembly of connectors with adjustable stud ends and
O--ring sealing
16.14.1 4.1 Preparation prior to assembly
4.1.1 To protect the sealing surfaces and prevent dirt and other contaminants from entering the
system, protective caps and/or plugs shall not be removed until it is time to assemble the components.
4.1.2 Just prior to assembly, protective caps and/or plugs shall be removed, and the connector and
the port shall be inspected to ensure that both mating parts are free of burrs, nicks, scratches or any
foreign material.
4.1.3 If an O-ring is not present, one shall be installed on the port end of the connector using a proper
O--ring installation tool, taking care not to cut or nick the O-ring.
4.1.4 The O--ring shall be lubricated with a light coat of system fluid or compatible oil.
2 © ISO 2023 – All rights reserved

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ISO/DTS 11686:2023(E)
16.24.2 4.2 Assembly
16.2.14.2.1 4.2.1 Illustration
4.2.1.1.1 Table Figure 1 illustrates the steps specified in 4.2.2 through 4.2.6 and the final
assembly.
Table 1 — Illustration of instructions for assembling connectors with adjustable stud ends and
O-ring sealing




a) Position 1: b) Position 2: c) Position 3: Hand d) Position 4: e) Position 5:
Locknut and washer Locknut in position tightened into port Connector backed off Connector tightened
backed off with O- to protect the back- until back-up washer fo
...

FINAL
TECHNICAL ISO/DTS
DRAFT
SPECIFICATION 11686
ISO/TC 131/SC 4
Connectors for fluid power and
Secretariat: ANSI
general use — Assembly instructions
Voting begins on:
2023-05-11 for connectors with adjustable stud
ends and O-ring sealing
Voting terminates on:
2023-07-06
Raccordements pour applications générales et transmissions
hydrauliques — Instructions d’assemblage pour des connecteurs avec
des éléments mâles ajustables et joint torique
RECIPIENTS OF THIS DRAFT ARE INVITED TO
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/DTS 11686:2023(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN-
DARDS TO WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS. © ISO 2023

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ISO/DTS 11686:2023(E)
FINAL
TECHNICAL ISO/DTS
DRAFT
SPECIFICATION 11686
ISO/TC 131/SC 4
Connectors for fluid power and
Secretariat: ANSI
general use — Assembly instructions
Voting begins on:
for connectors with adjustable stud
ends and O-ring sealing
Voting terminates on:
Raccordements pour applications générales et transmissions
hydrauliques — Instructions d’assemblage pour des connecteurs avec
des éléments mâles ajustables et joint torique
COPYRIGHT PROTECTED DOCUMENT
© ISO 2023
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.
RECIPIENTS OF THIS DRAFT ARE INVITED TO
ISO copyright office
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
CP 401 • Ch. de Blandonnet 8
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
CH-1214 Vernier, Geneva
DOCUMENTATION.
Phone: +41 22 749 01 11
IN ADDITION TO THEIR EVALUATION AS
Reference number
Email: copyright@iso.org
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­
ISO/DTS 11686:2023(E)
Website: www.iso.org
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
Published in Switzerland
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN­
DARDS TO WHICH REFERENCE MAY BE MADE IN
ii
  © ISO 2023 – All rights reserved
NATIONAL REGULATIONS. © ISO 2023

---------------------- Page: 2 ----------------------
ISO/DTS 11686:2023(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Instructions for the assembly of connectors with adjustable stud ends and O-ring
sealing . 1
4.1 Preparation prior to assembly. 1
4.2 Assembly . 2
4.2.1 Illustration . 2
4.2.2 Location of O­ring (Position 1 in Figure 1) . 2
4.2.3 Positioning of locknut (Position 2 in Figure 1) . 2
4.2.4 Installation of connector into the port (Position 3 in Figure 1) . 2
4.2.5 Connector adjustment (Position 4 in Figure 1) . 2
4.2.6 Final tightening (Position 5 in Figure 1) . 3
4.2.7 Final inspection . 3
Annex A (informative) Identification of ports, stud ends and plugs and potential for
incompatible intermixing .4
Bibliography .10
iii
© ISO 2023 – All rights reserved

---------------------- Page: 3 ----------------------
ISO/DTS 11686:2023(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 non­governmental, 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 document 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).
ISO draws attention to the possibility that the implementation of this document may involve the use
of (a) patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed
patent rights in respect thereof. As of the date of publication of this document, ISO had not received
notice of (a) patent(s) which may be required to implement this document. However, implementers are
cautioned that this may not represent the latest information, which may be obtained from the patent
database available at www.iso.org/patents. ISO shall not be held responsible for identifying any or all
such patent rights.
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/TS 11686:2017), which has been
technically revised.
The main changes are as follows:
— Figure 1 has been completely redrawn and Positions 4 and 5 have been corrected to accurately
reflect the position of the washer, nut, O-ring and body.
— Figure 1 Position 3 and Figure 2 have been redrawn to remove horizontal line in the flowpath.
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.
iv
  © ISO 2023 – All rights reserved

---------------------- Page: 4 ----------------------
ISO/DTS 11686:2023(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.
v
© ISO 2023 – All rights reserved

---------------------- Page: 5 ----------------------
TECHNICAL SPECIFICATION ISO/DTS 11686:2023(E)
Connectors for fluid power and general use — Assembly
instructions for connectors with adjustable stud ends and
O-ring sealing
1 Scope
This document provides common installation instructions for all connectors that have adjustable
stud ends and O-ring sealing. Conformance with the requirements of this document will result in a
considerable reduction of leaks in hydraulic systems.
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 5598, Fluid power systems and components — Vocabulary
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/
4 Instructions for the assembly of connectors with adjustable stud ends and
O-ring sealing
4.1 Preparation prior to assembly
4.1.1 To protect the sealing surfaces and prevent dirt and other contaminants from entering the
system, protective caps and/or plugs shall not be removed until it is time to assemble the components.
4.1.2 Just prior to assembly, protective caps and/or plugs shall be removed, and the connector and
the port shall be inspected to ensure that both mating parts are free of burrs, nicks, scratches or any
foreign material.
4.1.3 If an O­ring is not present, one shall be installed on the port end of the connector using a proper
O­ring installation tool, taking care not to cut or nick the O­ring.
4.1.4 The O-ring shall be lubricated with a light coat of system fluid or compatible oil.
1
© ISO 2023 – All rights reserved

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ISO/DTS 11686:2023(E)
4.2 Assembly
4.2.1 Illustration
Figure 1 illustrates the steps specified in 4.2.2 through 4.2.6 and the final assembly.
a) Position 1: Locknut b) Position 2: Locknut c) Position 3: Hand d) Position 4: Con- e) Position 5: Connec-
and washer backed in pos
...