ISO 12251:2017

INTERNATIONAL ISO
STANDARD 12251
Second edition
2017-09
Diesel engines — Clamp mounted CR
fuel injectors — Mounting dimensions
Moteurs diesels — Injecteurs de combustible pour rampe commune
fixée par patte — Dimensions de montage
Reference number
ISO 12251:2017(E)
©
ISO 2017

---------------------- Page: 1 ----------------------
ISO 12251:2017(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO 2017, Published in Switzerland
All rights reserved. Unless otherwise specified, 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
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2017 – All rights reserved

---------------------- Page: 2 ----------------------
ISO 12251:2017(E)

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms, definitions and symbols . 1
4 General requirements . 3
4.1 Clamp mounting arrangement . 3
4.2 Injector guiding dimensions. 4
4.3 Concentricity of the nozzle shaft . 4
4.4 High pressure connector . 5
5 Dimensions and tolerances . 6
5.1 Type A, clamp mounted CR fuel injectors with straight capnut . 6
5.2 Type B, clamp mounted CR fuel injectors with stepped capnut . 8
6 Other specifications .10
7 Designation .10
Bibliography .11
© ISO 2017 – All rights reserved iii

---------------------- Page: 3 ----------------------
ISO 12251:2017(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 differen
...