SIST EN ISO 17268-1:2025

SLOVENSKI STANDARD
01-december-2025
Nadomešča:
SIST EN ISO 17268:2020
Priključne naprave za oskrbo kopenskih vozil s plinastim vodikom - 1. del: Pretok
plina do vključno 120 g/s (ISO 17268-1:2025)
Gaseous hydrogen land vehicle refuelling connection devices - Part 1: Flow capacities
up to and including 120 g/s (ISO 17268-1:2025)
Gasförmiger Wasserstoff - Anschlussvorrichtungen für die Betankung von
Landfahrzeugen - Teil1: Durchflussmengen bis einschließlich 120g/s (ISO 17268-1:2025)
Dispositifs de raccordement pour le ravitaillement des véhicules terrestres en hydrogène
gazeux - Partie 1: Capacités de débit jusqu'à 120 g/s inclus (ISO 17268-1:2025)
Ta slovenski standard je istoveten z: EN ISO 17268-1:2025
ICS:
43.180 Diagnostična, vdrževalna in Diagnostic, maintenance and
preskusna oprema test equipment
71.100.20 Industrijski plini Gases for industrial
application
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 17268-1
EUROPEAN STANDARD
NORME EUROPÉENNE
August 2025
EUROPÄISCHE NORM
ICS 43.060.40; 27.075 Supersedes EN ISO 17268:2020
English Version
Gaseous hydrogen land vehicle refuelling connection
devices - Part 1: Flow capacities up to and including 120
g/s (ISO 17268-1:2025)
Dispositifs de raccordement pour le ravitaillement des Gasförmiger Wasserstoff - Anschlussvorrichtungen für
véhicules terrestres en hydrogène gazeux - Partie 1: die Betankung von Landfahrzeugen - Teil1:
Capacités de débit jusqu'à 120 g/s inclus (ISO 17268- Durchflussmengen bis einschließlich 120g/s (ISO
1:2025) 17268-1:2025)
This European Standard was approved by CEN on 2 May 2025.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 17268-1:2025 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 17268-1:2025) has been prepared by Technical Committee ISO/TC 197
"Hydrogen technologies " in collaboration with Technical Committee CEN/TC 268 “Cryogenic vessels
and specific hydrogen technologies applications” the secretariat of which is held by AFNOR.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by February 2026, and conflicting national standards
shall be withdrawn at the latest by February 2026.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 17268:2020.
This document has been prepared under a standardization request addressed to CEN by the European
Commission. The Standing Committee of the EFTA States subsequently approves these requests for its
Member States.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 17268-1:2025 has been approved by CEN as EN ISO 17268-1:2025 without any
modification.
International
Standard
ISO 17268-1
First edition
Gaseous hydrogen land vehicle
2025-08
refuelling connection devices —
Part 1:
Flow capacities up to and
including 120 g/s
Dispositifs de raccordement pour le ravitaillement des véhicules
terrestres en hydrogène gazeux —
Partie 1: Capacités de débit jusqu'à 120 g/s inclus
Reference number
ISO 17268-1:2025(en) © ISO 2025

ISO 17268-1:2025(en)
© ISO 2025
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
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CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
ISO 17268-1:2025(en)
Contents Page
Foreword .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 General construction requirements . 4
5 Nozzles . 7
6 Receptacles . 9
7 Design verification test procedures. .10
7.1 General requirements .10
7.2 Test conditions .10
7.3 Nozzle tests . .10
7.4 Receptacle tests .10
7.5 User — Machine interface test .10
7.6 Dropping test .11
7.7 Leakage at room temperature test .11
7.8 Valve operating handle test . 12
7.9 Receptacle vibration resistance test . 12
7.10 Abnormal loads test . 12
7.11 Low and high temperatures test . 13
7.11.1 Purpose . 13
7.11.2 General . 13
7.11.3 Leakage tests . 13
7.12 Operation tests .14
7.13 Durability and maintainability test .14
7.13.1 Purpose .14
7.13.2 Nozzle durability test .14
7.13.3 Receptacle check valve durability test . 15
7.13.4 Receptacle durability test . 15
7.13.5 Connector durability test.16
7.14 Sealing material aging test .16
7.14.1 Purpose .16
7.14.2 Oxygen aging test procedure .16
7.14.3 Ozone aging test procedure .16
7.15 Non-metallic material hydrogen resistance test .16
7.16 Electrical resistance test .17
7.17 Hydrostatic strength test .17
7.18 Corrosion resistance test .17
7.18.1 Purpose .17
7.18.2 General .17
7.18.3 Nozzle test .17
7.18.4 Receptacle test .17
7.19 Deformation test .18
7.20 Contamination test .18
7.21 Thermal cycle test .18
7.22 Misconnected nozzle test .18
7.23 Upward/downward compatibility test . 20
7.23.1 General . 20
7.23.2 Upward/downward compatibility test . 20
7.23.3 Other fuels receptacles incompatibility test . 20
7.24 Washout test . 20
7.25 User abuse test .21
7.26 Cold gas test .21
7.27 Rocking test . 22

iii
ISO 17268-1:2025(en)
7.28 Communication test . 23
8 Instructions .23
9 Marking . .24
9.1 Mandatory information .24
9.2 Non-mandatory information .24
Annex A (normative) Receptacle/nozzle interface envelope .25
Annex B (normative) Hydrogen receptacles .26
Annex C (normative) Loose fit test fixtures .33
Annex D (normative) Tight fit test fixtures .39
Annex E (normative) Wear pattern test fixtures .45
Annex F (informative) Example Hex Design . 51
Annex G (normative) Pressure drop test .52
Annex H (normative) Required test fixtures .55
Bibliography .56

iv
ISO 17268-1:2025(en)
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 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 197, Hydrogen technologies, in collaboration
with the European Committee for Standardization (CEN) Technical Committee CEN/TC 268, Cryogenic vessels
and specific hydrogen technologies applications, in accordance with the Agreement on technical cooperation
between ISO and CEN (Vienna Agreement).
This first edition of ISO 17268-1, together with ISO 17268-2, cancels and replaces ISO 17268:2020.
A list of all parts in the ISO 17628 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.

v
International Standard ISO 17268-1:2025(en)
Gaseous hydrogen land vehicle refuelling connection
devices —
Part 1:
Flow capacities up to and including 120 g/s
1 Scope
This document specifies the design, safety and operation characteristics of gaseous hydrogen land vehicle
(GHLV) refuelling connectors.
GHLV refuelling connectors consist of the following components, as applicable:
— receptacle and protective cap (mounted on vehicle);
— nozzle;
— communication hardware.
This document is applicable to refuelling connectors which have nominal working pressures or hydrogen
service levels up to 70 MPa and maximum flow rates up to 120 g/s.
This document is not applicable to refuelling connectors dispensing blends of hydrogen with natural gas.
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 188, Rubber, vulcanized or thermoplastic — Accelerated ageing and heat resistance tests
ISO 1431-1, Rubber, vulcanized or thermoplastic — Resistance to ozone cracking — Part 1: Static and dynamic
strain testing
ISO 9227, Corrosion tests in artificial atmospheres — Salt spray tests
ISO 12103-1, Road vehicles — Test contaminants for filter evaluation — Part 1: Arizona test dust
3 Terms and definitions
For the purposes of this document, the following terms and definitions 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/
3.1
communication hardware
infrared data association (IrDA) components which are used to transmit signals from the vehicle (receptacle)
(3.19) to the dispenser (nozzle) (3.14) and designed to meet SAE J2799 or equivalent

ISO 17268-1:2025(en)
3.2
component pressure rating
maximum pressure at which it is permissible to operate a component as specified by the manufacturer at a
specified temperature
Note 1 to entry: See Table 1 for required component pressure ratings for various pressure classes (3.16) of fuelling
connectors (3.3).
Note 2 to entry: Further guidance on dispenser pressure terminology is included in ISO 19880-1.
Table 1 — Dispensing system pressure levels and refuelling connector ratings
NWP (3.13) of vehicle Pressure class (3.16) Maximum operating Dispensing system max-
(receptacle) (3.19) pressure imum allowable working
or (MOP) (3.12) pressure
HSL (3.9) of dispenser
(MAWP) (3.11)
(nozzle) (3.14)
Minimum dispenser
component pressure
rating
Equal to NWP of the vehicle 1,25 × HSL/1,25 × NWP 1,375 × HSL
storage system per vehicle
Highest fill pressure during Highest permissible
label
normal fuelling setpoint for dispenser
pressure protection in
ISO 19880-1:2020, 8.2.2.3
a
35 MPa H35 or H35MF 43,75 MPa 48,125 MPa
70 MPa H70 87,5 MPa 96,25 MPa
a
Medium-flow connectors for heavy-duty commercial vehicles.
3.3
connector
joined assembly of nozzle (3.14) and receptacle (3.19) which permits the transfer of hydrogen
3.4
cycle
process of making a positive connection between the nozzle (3.14) and the receptacle (3.19), pressurizing to
the maximum operating pressure (3.12), depressurizing and disconnecting
3.5
dry air
air with a dew point adequate to prevent condensation during testing
3.6
dry helium
helium with a dew point adequate to prevent condensation during testing and at least 99 % pure
3.7
dry hydrogen
hydrogen which meets or exceeds the quality level in ISO 14687
3.8
hydrogen grade
level of hydrogen quality based upon ISO 14687
3.9
hydrogen service level
HSL
pressure level used to characterize the hydrogen service of the dispenser based on the NWP (3.13) rating of
the vehicle
Note 1 to entry: The numerical value of HSL also matches the number after the “H” in the pressure class (3.16).

ISO 17268-1:2025(en)
Note 2 to entry: HSL is expressed in MPa.
3.10
leak test gas
gas for testing leaks that consists of dry hydrogen (3.7), or dry helium (3.6), or blends of a minimum 50 mmol/
mol of hydrogen or helium with nitrogen
3.11
maximum allowable working pressure
MAWP
maximum pressure permissible in a system at the temperature specified for the pressure
Note 1 to entry: The maximum allowable working pressure can also be defined as the PS, design pressure, the maximum
allowable operating pressure, the maximum permissible working pressure, or the maximum allowable pressure for
the rating of pressure vessels and equipment manufactured in accordance with national pressure vessel codes.
3.12
maximum operating pressure
MOP
highest pressure that is expected for a component or system during normal operation
Note 1 to entry: Further guidance on dispenser pressure terminology is included in ISO 19880-1.
Note 2 to entry: The maximum operating pressure is 125 % of the nominal working pressure (3.13) or hydrogen service
level (3.9), as applicable, for the purpose of testing of nozzles (3.14) and receptacles (3.19) in this document.
3.13
nominal working pressure
NWP
pressure of a full vehicle compressed hydrogen storage system at a gas temperature of 15 °C
Note 1 to entry: See ECE/TRANS/180/Add.13/Amend.1 Part II-3.37.
Note 2 to entry: See Table 1 for NWPs covered in this document.
Note 3 to entry: Further guidance on pressure terminology is included in ISO 19880-1.
Note 4 to entry: NWP is also known as “settled pressure” in ISO 10286.
3.14
nozzle
device connected to a fuel dispensing system, which permits the quick connect and disconnect of fuel supply
to the vehicle or storage system
3.15
positive locking device
device with the feature which requires actuation of an interlocking mechanism to achieve proper connection
of the nozzle (3.14) to the receptacle (3.19) before pressure is applied
3.16
pressure class
non-dimensional rating of components that indicates the components are designed to dispense hydrogen to
road vehicles at the required pressure and temperature
Note 1 to entry: See Table 1 for pressure classes of fuelling connectors (3.3).
Note 2 to entry: Further guidance on dispenser pressure terminology is included in ISO 19880-1.
3.17
pressure drop
difference in pressure between two specific points at specific flow conditions

ISO 17268-1:2025(en)
3.18
protective cap
means to prevent dirt and other contaminants from getting into the inlet of the vehicle receptacle (3.19)
3.19
receptacle
device connected to a vehicle or storage system which receives the nozzle (3.14)
Note 1 to entry: This can also be referred to as a fuelling inlet of gas filling port in other documents.
4 General construction requirements
4.1 Nozzles and receptacles shall be designed in accordance with reasonable concepts of safety, durability
and maintainability.
4.2 Nozzles and receptacles designed and tested in accordance with this document shall:
a) prevent hydrogen fuelled vehicles from being filled by fuelling stations with pressures higher than the
design values specified for the vehicle, as shown in Table 2;
b) prevent hydrogen fuelled vehicles from being filled by fuelling stations with flow rates higher than the
design values specified for the vehicle, as shown in Table 2;
c) prevent hydrogen fuel cell vehicles which can only use ISO 14687 Grade D hydrogen from being filled by
fuelling stations that dispense ISO 14687 Grade F hydrogen, as shown in Table 2;
d) allow for internal combustion hydrogen vehicles which use ISO 14687 Grade F hydrogen to be filled by
fuelling stations that dispense ISO 14687 Grade D hydrogen, as shown in Table 2;
e) prevent hydrogen fuelled vehicles from being filled by other compressed gas fuelling stations, including
but not limited to those specified in ISO 16380, ISO 14469 and CSA NGV 1, as shown in Table 3;
f) prevent other gaseous fuelled vehicles from being filled by hydrogen fuelling stations including but not
limited to those specified in ISO 16380, ISO 14469 and CSA NGV 1, as shown in Table 3.

ISO 17268-1:2025(en)
Table 2 — Compatibility of nozzles and receptacles
←Receptacle→
Nozzle ↓ H35 H35MF H70 H35 H35MF H70 H35HF*
Grade D Grade D Grade D Grade F Grade F Grade F H70HF*
H35 O O O O O O X
Grade D
H35MF X O X X O X X
Grade D
H70 X X O X X O X
Grade D
H35 X X X O O O X
Grade F
H35MF X X X X O X X
Grade F
H70 X X X X X O X
Grade F
H35HF* X X X X X X O
H70HF*
*
H35HF and H70HF is mentioned in this document only for reference to future compatibility and will be specified in
ISO 17268-2, when published
Key
O: Can connect
X: Cannot connect
Table 3 — Incompatibility of nozzles and receptacles with systems for other gaseous fuels
←Receptacle→
Nozzle ↓ ISO 16380 ISO 14469 CSA NGV1
H35 X X X
Grade D
H35MF X X X
Grade D
H70 X X X
Grade D
H35 X X X
Grade F
H35MF X X X
Grade F
H70 X X X
Grade F
H35HF* X X X
H70HF*
*
H35HF and H70HF is mentioned in this document only for reference to future compatibility and will be specified in
ISO 17268-2, when published
Key
O: Can connect
X: Cannot connect
4.3 Nozzles and receptacles shall be well fitted and manufactured in accordance with good engineering
practice.
ISO 17268-1:2025(en)
4.4 Nozzles and receptacles shall be:
a) designed to minimise the possibility of incorrect assembly;
b) designed to be secure against displacement, distortion, warping or other damage;
c) constructed to maintain operational integrity under normal and reasonable conditions of handling
and usage
d) designed with no self-evident means of defeating the safety features without specialised knowledge and
tooling;
e) designed for use by the general public with minimal training.
4.5 Nozzles and receptacles shall be manufactured of materials suitable and compatible for use with
compressed hydrogen at the pressure and the temperature ranges to which they will be subjected as
specified in 3.2, 5.9 and 6.9. All pressure bearing and wetted components shall also be made from material
that is compatible with deionised water. Non-metallic material compatibility including compatibility of seal
materials based on aging testing (7.14) and hydrogen resistance testing (7.15) for material malfunctions
from diffusion and depressurization shall be documented by the component manufacturer or an independent
third party.
4.6 The nozzle shall be connected to or disconnected from the receptacle without the use of tools.
4.7 All receptacles shall be mounted on the vehicle in conformance with the envelope requirements
specified in Annex A (Figure A.1).
4.8 Protective caps are intended to protect the receptacle or nozzle from foreign debris and shall not hold
pressure. Resistance shall be appropriate to prevent inadvertent dislodging. All protective caps shall have a
retainer to attach them to the receptacle, vehicle, or nozzle.
4.9 Nozzles and receptacles defined in this document can be used to fuel different types of GHLVs. The
refuelling stations for these vehicles can have significantly different process limits and refuelling protocols.
The nozzle and receptacle alone shall ensure that a GHLV cannot refuel at an incompatible station. If
this occurs, the GHLV can be exposed to conditions outside of its intended limits, such as fuel container
overheating. If this is a potential problem, the user and station manufacturer should develop additional
controls to mitigate this risk.
4.10 Nozzles and receptacles shall be tested for filling station over pressurization in accordance with Part
I E. 81. (f) (iii) of ECE/TRANS/180/Add. 13/Amend 1 Global Technical Regulation No. 13 (Global technical
regulation on hydrogen and fuel cell vehicles).
4.11 The maximum volume of air allowed between the receptacle and nozzle after connection shall not
exceed the volumes in Table 4.
Table 4 — Maximum volume of air allowed between nozzle and receptacle after connection
3 3
Pressure class Nozzle allowable volume of air cm Receptacle allowable volume of air cm
H35 4 4
H35MF 4 4
H70 2 2
4.12 Flow rate category
The nozzle or receptacle shall be classified into the following maximum flow rate categories shown in
Table 5 based upon their anticipated usage. A nozzle or receptacle may have one or more maximum flow rate
categories based upon their usage.

ISO 17268-1:2025(en)
Table 5 — Maximum flow rate categories
Category Maximum flow rate
g/s
F30 30
F60 60
F90 90
F120 120
4.13 Pressure drop rating
The pressure drop of a nozzle or receptacle should be measured at each of its flow rate categories using the
procedure in Annex G (Figures G.1 to G.5).
The pressure drop rating(s) should be communicated by the manufacturer through the documentation and
instruction. The nomenclature of the pressure drop should be noted as the flow rate category plus P followed
by the measured pressure drop in MPa. (E.g. for a nozzle with a flow rate category of 90 g/s and a measured
pressure drop of 2 MPa, the nomenclature is: F90-P2.)
5 Nozzles
5.1 Nozzles shall be in accordance with the dimensional requirements of 6.1 to ensure proper
interchangeability according to 4.2.
5.2 Nozzles shall be one of the following three types.
a) TYPE A — A nozzle for use with dispensing hoses that may remain fully pressurized at dispenser
shutdown. The nozzle shall not allow gas to flow until a positive connection has been achieved. The
nozzle shall be equipped with an integral valve or valves, incorporating an operating mechanism which
first stops the supply of gas and safely vents the trapped gas before allowing the disconnection of the
nozzle from the receptacle. The operating mechanism shall ensure the vent connection is open before
the release mechanism can be operated and the gas located between the nozzle shut-off valve and the
receptacle check valve is safely vented prior to nozzle disconnection.
b) TYPE B — A nozzle for use with dispensing hoses that may remain fully pressurized at dispenser
shutdown. A separate three-way valve connected directly, or indirectly, to the inlet of the nozzle shall be
used to safely vent trapped gas prior to nozzle disconnection. The nozzle shall not allow gas to flow until
a positive connection has been achieved. Venting shall be achieved prior to disconnection of the nozzle.
External three-way valves shall be constructed and marked so as to indicate clearly the open, shut and
vent positions.
c) TYPE C — A nozzle for use with dispensing hoses which are depressurized (0,5 MPa and below) at
dispenser shutdown. The nozzle shall not allow gas to flow until a positive connection has been achieved.
The function of preventing flow may be controlled by the dispenser as long as it is receiving a positive
connection signal from the nozzle.
5.3 Nozzles shall be designed for a life of 100 000 cycles with manufacturer specified maintenance. The
three-way valve used for actuating Type B nozzles shall meet the same number of cycles as the nozzle (i.e.,
100 000 cycles).
5.4 Nozzles that have been subjected to 10 over-pressurization occurrences shall be removed from
service.
5.5 The act of venting, or de-pressurizing, of the connection space between all nozzle types and receptacles
shall be performed prior to disconnection. A provision shall be made for the venting or de-pressurizing of all
nozzle types to be directed to a safe location.

ISO 17268-1:2025(en)
5.6 The means for attaching the nozzle to the fuel dispensing system hose shall not rely on the joint
between the male and female threads for sealing, such as tapered pipe threads.
5.7 All nozzles shall fit within the envelope specified in Figure A.1.
5.8 If the nozzle has means to prevent the ingress of solid matter from upstream sources, it shall be
attached to the nozzle and subjected to all of the nozzle tests.
5.9 The nozzle shall be designed to operate at the temperatures shown in Table 6.
Table 6 — Design temperatures
Nozzle and connector Receptacle
Minimum tempera- Maximum tempera- Minimum tempera- Maximum tempera-
o o o o
ture C ture C ture C ture C
Ambient -40 65 -40 85
Hydrogen -40 65 -40 85
5.10 The nozzle shall be designed so that it does not freeze on the receptacle for more than 30 s after
fuelling.
5.11 The nozzle shall not have any mechanical means of opening the receptacle check valve.
5.12 The appearance of the nozzle and receptacle shall be such as to clearly suggest the proper method of use.
5.13 It shall not be possible to deliver gas unless the nozzle and receptacle are connected properly and
positively locked.
5.14 It shall not be possible to remove a nozzle if the pressure in the assembly is greater than 1,0 MPa.
5.15 The nozzle shall prevent all flow of gas upon disconnection according to the corresponding operating
instruction. The nozzle shall not experience any force upon disconnection according to the corresponding
operating instruction that causes it to push away from the receptacle. No other hazardous condition shall
result from disconnection.
5.16 Unpressurized nozzles shall require an axial force to connect and lock or unlock and disconnect the
device of less than or equal to 90 N. On a secondary positive locking device which incorporates a rotary
locking mechanism, the torque to lock or unlock the locking means shall not exceed 1 Nm. On a secondary
positive locking device which incorporates an axial locking mechanism, the force to lock or unlock the
locking means shall not exceed 90 N.
5.17 It shall not be possible to disconnect any type of nozzle pressurized at 7,5 MPa or more with a force
less than 5 times the disconnection force specified in 5.16. It shall not be possible to disconnect any type of
nozzle pressurized at 1 MPa with a force less than 2 times the disconnection force specified in 5.16.
5.18 Communication hardware (including electrical connectors, wires, covers, infrared filters) which is
supplied with the nozzle by the manufacturer shall be attached to the nozzle and subjected to the following
design verification tests indicated by the corresponding subclause number:
— 7.6 Dropping test;
— 7.8 Valve operating handle test;
— 7.10 Abnormal loads test;
ISO 17268-1:2025(en)
— 7.11 Low and high temperatures test;
— 7.13 Durability and maintainability test;
— 7.18 Corrosion resistance test;
— 7.19 Deformation test;
— 7.20 Contamination test;
— 7.21 Thermal cycle test;
— 7.25 User abuse test;
— 7.26 Cold gas test.
If the communication hardware on the nozzle is integrated into the nozzle and cannot be replaced in the
field, it shall be integrated into the nozzle during the tests. The communication hardware on the vehicle may
be tested without being integrated into a receptacle. If the communication hardware on the nozzle is field
replaceable or provided by an external supplier, then it should be attached to the nozzle during the following
nozzle test:
— 7.6 Dropping test.
The communication hardware shall be fully operational upon completion of the above design verification
tests as demonstrated by 7.28.
6 Receptacles
6.1 Standard receptacle dimensions: A receptacle shall be in accordance with the design specifications
detailed in Annex B (Figures B.1 to B.7).
NOTE The main O-ring seal for all pressure class ratings less than 70 MPa is situated at the leading edge of
the receptacle. For the 70 MPa receptacle, the main O-ring seal is situated in the bore of the receptacle. The 70 MPa
receptacle also includes an O-ring at the leading edge of the receptacle to seal with nozzles having pressure ratings
less than 70 MPa.
In order to address freezing issues, the contact surface area between the nozzle and the receptacle on the
back diameter (25 mm) may be reduced by modifying the shape of the receptacle body in this area. Annex F
(Figure F.1) shows an example hex design which meets this criterion. The receptacle with the reduced
contact area shall
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