UN R134 Supplement 3 (02 series) · UNECE Regulation No. 134 (ECE R134) — Uniform provisions concerning the approval of motor vehicles and their components with regard to the safety-related performance of Hydrogen-Fuelled Vehicles (HFCV).

UN R134 — Supplement 3 to the 02 series of amendments

Supplement 2 → 3

Adopted at the WP.29 197th sessionEntry into force 2026-06-04

Compare Read full text

What changed: In paragraph 7.1.1.5., the list of fuelling receptacle specifications is now H35, H35MF or H70, instead of H35, H35HF or H70.
The geometry of the fuelling receptacle of compressed hydrogen gas vehicles must be in accordance with ISO 17268:2020 or ISO 17268-1:2025.
Before this supplement, the paragraph named ISO 17268:2020 as the standard for this geometry.
Why: According to the proposer, ISO 17268-1:2025 includes new technologies to allow higher flow rate, such as H35MF.
Some H35HF nozzles could be mated with an H70 receptacle, which may potentially result in overheating of the container. ISO 17268-1:2025 removed H35HF to prevent this incorrect assembly.

Q1What changed1 change

Fuelling receptacle geometry: H35MF and ISO 17268-1:2025 (para. 7.1.1.5.)

For compressed hydrogen gas vehicles, the fuelling receptacle geometry must be compatible with H35, H35MF or H70, depending on nominal working pressure and specific application. The geometry must also be in accordance with international standard ISO 17268:2020 or ISO 17268-1:2025. Before this supplement, the geometry had to conform to ISO 17268:2020 and be compatible with specification H35, H35HF or H70.

The geometry of the fuelling receptacle of compressed hydrogen gas vehicles shall conform to international standard ISO 17268:2020 and be compatible with specification H35, H35HF or H70 depending on its nominal working pressure and specific application, be compatible with specification H35, H35MF or H70, and in accordance with international standard ISO 17268:2020 or ISO 17268-1:2025.

See every change side by side in Compare

Q2Why it changed

Proposed by: OICA
Working party: GRSP, 77th session (May 2025)

Reasons

Reasons given by the proposer: OICA, in informal document GRSP-77-46-Rev.1. GRSP adopted GRSP-77-46-Rev.1 and asked the secretariat to submit it as the proposal for supplement 3 to the 02 series of amendments to the November 2025 sessions of WP.29 and AC.1 (ECE/TRANS/WP.29/GRSP/77, para. 30).

ISO 17268:2020 will be replaced by ISO 17268-1:2025 in the middle of 2025. ISO 17268-1:2025 includes new technologies to allow higher flow rate, such as H35MF and a slightly updated design of H70.
Source
“ISO 17268:2020 will be replaced by ISO 17268-1:2025 in the middle of 2025 where new technologies to allow higher flow rate, such as H35MF and slightly updated design of H70, are included in the standard.”
GRSP-77-46-Rev.1II. Justification, para. 1
To allow these new technologies, the reference to the updated standard should be added as an alternative. Within the same specification code, receptacles according to the 2025 standard must be compatible with nozzles that comply with the 2020 standard or vice versa.
Sources (2)
“In order to allow such new technologies introduced in ISO 17268-1:2025, the reference to the updated standard should be added as an alternative.”
GRSP-77-46-Rev.1II. Justification, para. 2
“Within the same specification code, the fuelling receptacles according to the 2025 standard shall have the compatibility with the nozzles complying with the 2020 standard or vice versa.”
GRSP-77-46-Rev.1II. Justification, para. 2
During the development of ISO 17268-1:2025, a safety concern of H35HF was identified. Some H35HF nozzles could be mated with an H70 receptacle, which may potentially result in overheating of the container. For this reason, ISO 17268-1:2025 adopted a new specification H35MF and removed H35HF to prevent such unintended incorrect assembly.
Sources (2)
“During the development of ISO 17268-1:2025, a safety concern of H35HF has been identified where some of H35HF nozzles could be mated with H70 receptacle that may potentially result in overheating of the container.”
GRSP-77-46-Rev.1II. Justification, para. 3
“Accordingly, ISO17268-1:2025 adopted a new specification H35MF and removed H35HF in order to prevent such unintended incorrect assembly.”
GRSP-77-46-Rev.1II. Justification, para. 3

Document trail

—ProposalGRSP-77-46-Rev.1Proposal for supplement 3 to the 02 series of amendments
—Working party adoptsECE/TRANS/WP.29/GRSP/77GRSP session report, para. 30 and Annex VI
2025-08Sent to WP.29ECE/TRANS/WP.29/2025/131Text that GRSP sent to WP.29 and AC.1
2025-11WP.29 adoptsECE/TRANS/WP.29/1188Adopted at the 197th session (session report, para. 110)
2026-06-04In forceC.N.229.2026.TREATIES-XI.B.16.134UN depositary notification

Q3Who is affected

Vehicle manufacturer

Check whether a fuelling receptacle of a compressed hydrogen gas vehicle uses specification H35HF, which paragraph 7.1.1.5. no longer lists.
Make sure the fuelling receptacle geometry of compressed hydrogen gas vehicles is in accordance with ISO 17268:2020 or ISO 17268-1:2025.

Component supplier

Make sure your fuelling receptacles are compatible with H35, H35MF or H70, depending on nominal working pressure and specific application.

Technical service / Approval authority

Be ready to check receptacle geometry of compressed hydrogen gas vehicles against ISO 17268:2020 or ISO 17268-1:2025 (paragraph 7.1.1.5.).

See every change side by side

RegVault customers compare every version of UN regulations, read the consolidated text and download the PDF.

Start free trial Sign in

ⓘ This report gives advice only. It is not legal or type-approval advice.

More UN R134 change reports

All UN R134 change reports