ISO 7299-2:2021

Diesel engines - End-mounting flanges for pumps - Part 2: High-pressure supply pumps for common rail fuel injection systems

This document specifies dimensional requirements for 10 types of end-mounting flanges of high-pressure supply pumps for common rail fuel injection systems for use in diesel (compression-ignition) engines.

Moteurs diesels — Brides de montage des pompes — Partie 2: Pompes d'alimentation à haute pression pour systèmes d'injection de combustible à rampe commune

General Information

• Status: Published
• Publication Date: 23-Aug-2021
• ICS: 43.060.40 - Fuel systems
• Technical Committee: ISO/TC 22/SC 34 - Propulsion, powertrain and powertrain fluids
• Drafting Committee: ISO/TC 22/SC 34/WG 2 - Injection equipment
• Current Stage: 6060 - International Standard published
• Start Date: 24-Aug-2021
• Due Date: 01-Sep-2022
• Completion Date: 24-Aug-2021

Relations

• Revises: ISO 7299-2:2009 - Diesel engines - End-mounting flanges for pumps - Part 2: High-pressure supply pumps for common rail fuel injection systems
• Effective Date: 23-Apr-2020

Overview

ISO 7299-2:2021 - Diesel engines - End-mounting flanges for pumps - Part 2 - specifies dimensional requirements for end-mounting flanges used on high‑pressure supply pumps for common rail fuel injection systems in diesel (compression‑ignition) engines. This second edition updates the 2009 version and standardizes 10 types of pump end flanges (Types 1–10), including variants with tang drives. The document contains figures and tables giving flange geometry, hole positions and tolerances to support mechanical interchangeability.

Key topics and requirements

• Scope: Dimensional requirements for 10 end‑mounting flange types for high‑pressure supply pumps used in common rail systems.
• Flange types: Types 1–10 are defined; Types 2 and 5 explicitly include tang drive shaft arrangements. The 2021 edition adds Types 8, 9 and 10 to the previous seven types.
• Dimensions and tolerances: Detailed figures and tables provide flange diameters, mounting-hole patterns and axial/ radial dimensions. Engine manufacturers are recommended to use tolerance H7 for the female register diameter.
• Interchangeability: The standard enables consistent mechanical interfaces between pumps and engine housings by specifying nominal sizes, fits and hole configurations.
• References and conformity: Bibliography links related ISO standards used for threads, tolerances and shaft tapers (e.g., ISO 6519, ISO 286-2, ISO 261, ISO 965-1). The document contains no normative references but cross‑references established ISO dimensional practices.

Applications and users

Who uses ISO 7299-2:2021:

• Engine manufacturers (OEMs) designing the engine end for pump mounting and ensuring compatibility with supplier pumps.
• Pump manufacturers and suppliers specifying flange geometry to match common engine mounts and reduce variant counts.
• Tier 1 suppliers and integrators responsible for engine assembly, aftermarket retrofit kits and replacement pumps.
• Design, CAD and test engineers implementing mounting interfaces into 3D models, tolerance stacks and validation plans.
• Standards and procurement teams that require standardized interfaces to streamline sourcing and reduce development time.

Practical benefits:

• Promotes mechanical interchangeability of high‑pressure supply pumps in common rail diesel systems.
• Reduces design rework and tooling costs by aligning pump-to-engine interfaces.
• Supports supply‑chain flexibility and aftermarket compatibility.

Related standards

Relevant ISO documents cited in the bibliography:

• ISO 6519 - Diesel engines: tapers for shaft ends and hubs
• ISO 286‑2 - Tolerance classes for holes and shafts
• ISO 261, ISO 965‑1 - Metric screw thread dimensions and tolerances

Keywords: ISO 7299-2:2021, diesel engines, end-mounting flanges, high-pressure supply pumps, common rail, fuel injection systems, dimensional requirements, H7 tolerance, pump mounting, pump interchangeability.

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 7299-2
Second edition
2021-08
Diesel engines — End-mounting
flanges for pumps —
Part 2:
High-pressure supply pumps for
common rail fuel injection systems
Moteurs diesels — Brides de montage des pompes —
Partie 2: Pompes d'alimentation à haute pression pour systèmes
d'injection de combustible à rampe commune
Reference number
©
ISO 2021
© ISO 2021
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
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below or ISO’s member body in the country of the requester.
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Published in Switzerland
ii © ISO 2021 – All rights reserved

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Dimensions and tolerances . 1
4.1 General . 1
4.2 High-pressure supply pumps . 1
4.2.1 Type 1 end-mounting flange . 1
4.2.2 Type 2 end-mounting flange (with tang drive) . 2
4.2.3 Type 3 end-mounting flange . 3
4.2.4 Type 4 end-mounting flange . 4
4.2.5 Type 5 end-mounting flange (with tang drive) . 5
4.2.6 Type 6 end-mounting flange . 6
4.2.7 Type 7 end-mounting flange . 7
4.2.8 Type 8 end-mounting flange . 8
4.2.9 Type 9 end-mounting flange . 9
4.2.10 Type 10 end-mounting flange .10
Bibliography .11
Foreword
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electrotechnical standardization.
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described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
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iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 34,
Propulsion, powertrain and powertrain fluids.
This second edition cancels and replaces the first edition (ISO 7299-2:2009), which has been technically
revised.
The main changes compared to the previous edition are as follows:
— three (3) further types of end-mounting flanges (types 8, 9 and 10) are added to the already existing
seven (7) types of end-mounting flanges (type 1 to type 7).
A list of all parts in the ISO 7299 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.
iv © ISO 2021 – All rights reserved

Introduction
Modern diesel engines for road vehicles have usually fuel injection systems based on the common
rail principle. Such systems have a high-pressure fuel supply pump to supply the rail with highly
pressurized fuel.
...