prEN ISO 17268-2

Gaseous hydrogen land vehicle refuelling connection devices - Part 2: Flow capacities greater than 120 g/s (ISO/DIS 17268-2:2026)

This document defines the design, safety and operation characteristics of gaseous hydrogen land vehicle (GHLV) refuelling connectors having flow capacities greater than 120 g/s.
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.
This document is not applicable to refuelling connectors dispensing blends of hydrogen with natural gas.

Gasförmiger Wasserstoff - Anschlussvorrichtungen für die Betankung von Landfahrzeugen - Teil 2: Durchflussmengen von mehr 120 g/s (ISO/DIS 17268-2:2026)

Dispositifs de raccordement pour le ravitaillement des véhicules terrestres en hydrogène gazeux - Partie 2 Capacités de débit supérieures à 120 g/s (ISO/DIS 17268-2:2026)

Priključne naprave za oskrbo kopenskih vozil s plinastim vodikom - 2. del: Pretok plina večji od 120 g/s (ISO/DIS 17268-2:2026)

Ta dokument opredeljuje zasnovo, varnostne in obratovalne značilnosti priključkov za polnjenje kopenskih vozil na plinasti vodik (GHLV) z zmogljivostjo pretoka večjo od 120 g/s.
Priključki za polnjenje GHLV obsegajo naslednje komponente, kjer je primerno:
- vtičnica in zaščitni pokrov (nameščena na vozilu);
- šoba;
- komunikacijska strojna oprema.
Ta dokument se uporablja za priključke za polnjenje, ki imajo nazivni delovni tlak ali ravni storitev vodika do 70 MPa.
Ta dokument se ne uporablja za priključke za polnjenje, ki distribuirajo mešanice vodika z zemeljskim plinom.

General Information

• Status: Not Published
• Publication Date: 10-Oct-2027
• Technical Committee: CEN/TC 268 - Cryogenic vessels
• Drafting Committee: CEN/TC 268/WG 5 - Specific hydrogen technologies applications
• Current Stage: 4020 - Submission to enquiry - Enquiry
• Start Date: 12-Mar-2026
• Due Date: 19-Jul-2025
• Completion Date: 12-Mar-2026
• Directive: Not Harmonized2023/1804 - Regulation (EU) 2023/1804 of the European Parliament and of the Council of 13 September 2023 on the deployment of alternative fuels infrastructure, and repealing Directive 2014/94/EU
• Directive:

  ---

  Not Harmonized2023/1804-1 - Regulation (EU) 2023/1804 of the European Parliament and of the Council of 13 September 2023 on the deployment of alternative fuels infrastructure, and repealing Directive 2014/94/EU
• Directive:

  ---

  Not Harmonized2023/1804-2 - Regulation (EU) 2023/1804 of the European Parliament and of the Council of 13 September 2023 on the deployment of alternative fuels infrastructure, and repealing Directive 2014/94/EU
• Mandate: M/581 - Standardisation Request as regards communication exchange, electricity, and hydrogen supply for road, maritime transport and inland navigation in support of Directive 2014/94/EU and its planned revision under the ‘Fit for 55’package
• Ref Project: oSIST prEN ISO 17268-2:2026 - Gaseous hydrogen land vehicle refuelling connection devices - Part 2: Flow capacities greater than 120 g/s (ISO/DIS 17268-2:2026)

Standards Content (Sample)

SLOVENSKI STANDARD
01-maj-2026
Priključne naprave za oskrbo kopenskih vozil s plinastim vodikom - 2. del: Pretok
plina večji od 120 g/s (ISO/DIS 17268-2:2026)
Gaseous hydrogen land vehicle refuelling connection devices - Part 2: Flow capacities
greater than 120 g/s (ISO/DIS 17268-2:2026)
Gasförmiger Wasserstoff - Anschlussvorrichtungen für die Betankung von
Landfahrzeugen - Teil 2: Durchflussmengen von mehr 120 g/s (ISO/DIS 17268-2:2026)
Dispositifs de raccordement pour le ravitaillement des véhicules terrestres en hydrogène
gazeux - Partie 2 Capacités de débit supérieures à 120 g/s (ISO/DIS 17268-2:2026)
Ta slovenski standard je istoveten z: prEN ISO 17268-2
ICS:
27.075 Tehnologija vodika Hydrogen technologies
43.060.40 Sistemi za gorivo Fuel systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
International
Standard
ISO/DIS 17268-2
ISO/TC 197
Gaseous hydrogen land vehicle
Secretariat: SCC
refuelling connection devices —
Voting begins on:
Part 2: 2026-03-13
Flow capacities greater than 120 g/s
Voting terminates on:
2026-06-05
ICS: 27.075; 43.060.40
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS.
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 SUPPORTING DOCUMENTATION.
Reference number
ISO/DIS 17268-2:2026(en)
DRAFT
ISO/DIS 17268-2:2026(en)
International
Standard
ISO/DIS 17268-2
ISO/TC 197
Gaseous hydrogen land vehicle
Secretariat: SCC
refuelling connection devices —
Voting begins on:
Part 2:
Flow capacities greater than 120 g/s
Voting terminates on:
ICS: 27.075; 43.060.40
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
© ISO 2026
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
BE CONSIDERED IN THE LIGHT OF THEIR
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
or ISO’s member body in the country of the requester.
NATIONAL REGULATIONS.
ISO copyright office
RECIPIENTS OF THIS DRAFT ARE INVITED
CP 401 • Ch. de Blandonnet 8
TO SUBMIT, WITH THEIR COMMENTS,
CH-1214 Vernier, Geneva
NOTIFICATION OF ANY RELEVANT PATENT
Phone: [phone]
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION.
Email: [e-mail]
Website: www.iso.org
Published in Switzerland Reference number
ISO/DIS 17268-2:2026(en)
ii
ISO/DIS 17268-2:2026(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 . 12
7.8 Valve operating handle test . 13
7.9 Receptacle vibration resistance test . 13
7.10 Abnormal loads test . 13
7.11 Low and high temperature tests .14
7.11.1 Purpose .14
7.11.2 General .14
7.11.3 Leakage tests .14
7.12 Operation tests .14
7.13 Durability and maintainability test . 15
7.13.1 Purpose . 15
7.13.2 Nozzle durability test . 15
7.13.3 Receptacle check valve durability test .16
7.13.4 Receptacle durability test .16
7.13.5 Connector durability test.16
7.14 Sealing material aging test .17
7.14.1 Purpose .17
7.14.2 Oxygen aging test procedure .17
7.14.3 Ozone aging test procedure .17
7.15 Non-metallic material hydrogen resistance test .17
7.16 Electrical resistance test .17
7.17 Hydrostatic strength test .17
7.17.1 General .17
7.17.2 Nozzle test .18
7.17.3 Receptacle test/Connector test .18
7.18 Corrosion resistance test .18
7.18.1 Purpose .18
7.18.2 General .18
7.18.3 Nozzle test .18
7.18.4 Receptacle test .18
7.19 Deformation test .19
7.20 Contamination test .19
7.21 Thermal cycle test .19
7.22 Misconnected nozzle test .19
7.23 Compatibility and incompatibility connection tests .21
7.23.1 General .21
7.23.2 Pressure and Fuel Grade test .21
7.23.3 Other gaseous standards incompatibility test .21
7.24 User abuse test .21

iii
ISO/DIS 17268-2:2026(en)
7.25 Cold gas test .21
7.25.1 Nozzle icing test .21
7.25.2 Pre-cooled hydrogen test . . . 23
7.26 Rocking test . 23
7.27 Communication test . 23
8 Instructions .24
9 Marking . .24
9.1 Mandatory information .24
9.2 Non-mandatory information . 25
Annex A (normative) Receptacle/nozzle interface envelope .26
Annex B (normative) Hydrogen receptacles .27
Annex C (normative) Loose fit test fixtures .31
Annex D (normative) Tight fit test fixtures .35
Annex E (normative) Wear pattern test fixtures .39
Annex F (informative) Example Hex Design .43
Annex G (informative) Pressure drop test .44
Annex H (normative) Required test fixtures .49
Bibliography .51

iv
ISO/DIS 17268-2:2026(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 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 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 is a companion document to ISO 17268-1:2025, but for high flow (HF) systems.
The main changes compared to ISO 17268-1:2025 are as follows:
— Requirements and test procedures for connectors at flow rates greater than 120 g/s
— Section 4.11Table 4 volume values increased to 30 cm
— Section 4.12Table 5 flow rate values increased to represent higher flow rates
— Section 5.15 connection force value increased to 150 N
— Section 5.16 disconnection force value increased to 450 N
— Section 7.6 height value decreased to 1,8 m
— Section 7.9 changed vibration test profile to match commercial vehicle applications
— Section 7.20 eliminated submersion depth to account for larger components
— Section 7.22 added increased shim diameters
— Section 7.24 suspended weight value increased to 10 kg
— Section 7.25.1 cycles decreased to 6 with 10 min pulses, 15 min pauses
— Section 7.26 applied moment was increased to 115 Nm
— Annex A clearance envelope increased to accommodate larger nozzles
— Annexes B-E drawings added for high flow receptacle profiles

v
ISO/DIS 17268-2:2026(en)
— Annex G drawings added for larger couplings
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.

vi
DRAFT International Standard ISO/DIS 17268-2:2026(en)
Gaseous hydrogen land vehicle refuelling connection
devices —
Part 2:
Flow capacities greater than 120 g/s
1 Scope
This document defines 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 having flow capacities greater than 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
ISO 16750-3, Road vehicles — Environmental conditions and testing for electrical and electronic equipment —
Part 3: Mechanical loads
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/

ISO/DIS 17268-2:2026(en)
3.1
communication hardware
components which are used to transmit signals from the vehicle (receptacle) (3.18) to the dispenser (nozzle)
(3.13), designed to meet SAE J2799 in case of infrared technology or an equivalent standard
Note 1 to entry: Other communication hardware technologies are under development, e.g. wireless technologies. At the
time of publication, the standard ISO 19885-2 “Gaseous hydrogen — Fuelling protocols for hydrogen-fuelled vehicles
— Part 2: Definition of communications between the vehicle and dispenser control systems” was being developed.
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 (3.15) 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 (3.12) of vehicle Pressure class (3.15) Maximum operating Dispensing system max-
(receptacle) (3.18) pressure imum allowable working
or (MOP) (3.11) pressure
HSL (3.8) of dispenser
(MAWP) (3.10)
(nozzle) (3.13)
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 setpoint
label
normal fuelling for dispenser pressure pro-
tection in ISO 19880-1:2020,
8.2.2.3
a
35 MPa H35HF 43,75 MPa 48,125 MPa
a
70 MPa H70HF 87,5 MPa 96,25 MPa
a
This signifies the pressure class combined with the flow capacity.
3.3
connector
joined assembly of nozzle (3.13) and receptacle (3.18) which permits the transfer of hydrogen
3.4
cycle
process of making a positive connection between the nozzle (3.13) and the receptacle (3.18), pressurizing to
the specified test pressure, depressurizing and disconnecting, unless otherwise specified in the test clause
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 Grade D or Grade F

ISO/DIS 17268-2:2026(en)
3.8
hydrogen service level
HSL
pressure level used to characterize the hydrogen service of the dispenser based on the NWP (3.10) rating of
the vehicle
Note 1 to entry: The numerical value of HSL also matches the number after the “H” in the pressure class (3.13).
Note 2 to entry: HSL is expressed in MPa.
3.9
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
3.10
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.
3.11
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 (3.12) or hydrogen service
level (3.8), as applicable, for the purpose of testing of nozzles (3.13) and receptacles (3.18) in this document.
3.12
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.
3.13
nozzle
device connected to a fuel dispensing system, which permits the quick connect and disconnect of fuel supply
to the vehicle or storage system
3.14
positive locking device
device with the feature which requires actuation of an interlocking mechanism to achieve proper connection
of the nozzle (3.13) to the receptacle (3.18) before pressure is applied

ISO/DIS 17268-2:2026(en)
3.15
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.
3.16
pressure drop
difference in pressure between two specific points at specific flow conditions
3.17
protective cap
means to prevent dirt and other contaminants from getting into the inlet of the vehicle receptacle (3.18)
3.18
receptacle
device connected to a vehicle or storage system which receives the nozzle (3.13)
Note 1 to entry: This can also be referred to as a fuelling inlet or 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 different 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 3;
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/DIS 17268-2:2026(en)
Table 2 — Compatibility of nozzles with receptacles
←Receptacle →
Nozzle H35HF H70HF H35HF H70HF
↓ Grade D Grade D Grade F Grade F
H35HF
O X O X
Grade D
H70HF
X O X O
Grade D
H35HF
X X O X
Grade F
H70HF
X X X O
Grade F
Key
O: Can connect
X: Cannot connect
Table 3 — Incompatibility of nozzles with receptacles
←Receptacle →
ISO 17268-1 ISO 16380 ISO 14469 CSA NGV1
Nozzle H35 H35MF H70 H35 H35MF H70 N200 N250 C200 C250 P30HD P36HD
↓ Grade D Grade D Grade D Grade F Grade F Grade F
H35HF X X X X X X X X X X X X
Grade D
H70HF X X X X X X X X X X X X
Grade D
H35HF X X X X X X X X X X X X
Grade F
H70HF X X X X X X X X X X X X
Grade F
Key
O: Can connect
X: Cannot connect
4.3 Nozzles and receptacles shall be well fitted and manufactured in accordance with good engineering
practice.
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

ISO/DIS 17268-2:2026(en)
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 compliance with the envelope requirements
specified in Annex A (Figure A.1). This space is a clearance envelope to allow connecting and disconnecting
the nozzle to or from the receptacle when the fuelling door is open.
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 may 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 over-pressurization in 7.13.2 and 7.13.4 to demonstrate
compliance 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
Pressure class Nozzle allowable volume of air Receptacle allowable volume of air
3 3
cm cm
H35HF 30 30
H70HF 30 30
Note For the case of a hydrogen storage system containing 60 kg of compressed hydrogen, a trapped volume
of 30 cm of air would result in a final fuel system nitrogen concentration of 0,49 ppm and an oxygen concentration
of 0,15 ppm, which are both well below the maximum allowable nitrogen and oxygen concentrations for Grade D
hydrogen fuel per ISO 14687.
4.12 Flow rate category
The nozzle or receptacle shall be classified into the following maximum flow rate categories shown in
Table 5.
Table 5 — Maximum flow rate categories
Pressure Class Category Maximum flow rate
g/s
H35HF F180 180
H70HF F300 300
ISO/DIS 17268-2:2026(en)
4.13 Pressure drop rating
The pressure drop of a nozzle or receptacle should be measured at its flow rate category using the procedure
in Annex G (Figures G.1-G.5).
The pressure drop rating(s) should be communicated by the manufacturer through the documentation
and instruction. The manufacturer should indicate whether this pressure drop has been measured with or
without filters. 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 180 g/s and a
measured pressure drop of 2 MPa, the nomenclature is: F180-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 after cessation of
the fuelling process. 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 after cessation of the
fuelling process. 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) after
cessation of the fuelling process. 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.
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 Annex A (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.

ISO/DIS 17268-2:2026(en)
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-
ture °C ture °C ture °C ture °C
Ambient -40 65 -40 85
Hydrogen -40 65 -40 85
Note The receptacle maximum temperature is specified as 85 °C because onboard vehicle fuel system
components are qualified to 85 °C.
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 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.
5.15 Unpressurized nozzles shall require an axial force to connect and lock or unlock and disconnect the
device of less than or equal to 150 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 150 N.
5.16 It shall not be possible to disconnect any type of nozzle pressurized at 7,5 MPa or more with a force
less than 450 N. 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 5.15.
5.17 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;
— 7.11 Low and high temperature tests;
— 7.13 Durability and maintainability test;
— 7.18 Corrosion resistance test;
— 7.19 Deformation test;
— 7.20 Contamination test;
ISO/DIS 17268-2:2026(en)
— 7.21 Thermal cycle test;
— 7.24 User abuse test;
— 7.25 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 7.27.
5.18 H35HF and H70HF nozzles shall only be installed on dispensers using fuelling protocols designed for
fuelling vehicle fuel system volumes larger than 248,6 L.
6 Receptacles
6.1 Standard receptacle dimensions: A receptacle shall be in accordance with the design specifications
detailed in Annex B (Figures B.1-B.5).
In order to address freezing issues, the contact surface area between the nozzle and the receptacle on the
back diameter (42 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 be in accordance with this document.
6.2 Receptacles shall be in accordance with this document. The failure of any test conducted with the
receptacle and nozzle test samples shall constitute a failure of the receptacle design.
6.3 Receptacles shall be designed for a life of 15 000 cycles and at least 15 years with manufacturer
specified maintenance.
6.4 Receptacle designs, which employ means on the back diameter to accommodate mounting, or for
mounting accessories or marking purposes, shall not have such means extend beyond the back diameter
dimensions of the profile specified in Annex B, as applicable. Acceptable means shall include wrench flats,
protective cap anchoring grooves, use of hex stock, undercutting for marking, and threads for protective
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