IEC 60297-3-103:2004

INTERNATIONAL IEC
STANDARD 60297-3-103
First edition
2004-08
Mechanical structures for electronic equipment –
Dimensions of mechanical structures
of the 482,6 mm (19 in) series –
Part 3-103:
Keying and alignment pin
Reference number
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INTERNATIONAL IEC
STANDARD 60297-3-103
First edition
2004-08
Mechanical structures for electronic equipment –
Dimensions of mechanical structures
of the 482,6 mm (19 in) series –
Part 3-103:
Keying and alignment pin
” IEC 2004  Copyright - all rights reserved
No part of this publication may be reproduced or utilized in any form or by any means, electronic or
mechanical, including photocopying and microfilm, without permission in writing from the publisher.
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– 2 – 60297-3-103 ” IEC:2004(E)
CONTENTS
FOREWORD.3
INTRODUCTION.5
1 Scope and object.6
2 Normative references .6
3 Terms and definitions .6
4 Arrangement overview: Keying of plug-in units in a subrack.7
4.1 General .7
4.2 Subrack interface dimensions for keying .8
4.3 Plug-in unit keying interface dimensions.8
4.4 Key dimensions .9
4.5 Programming of keys .9
4.6 Keying chamber inspection dimensions .10
5 Arrangement overview: alignment and/or electrical contact of a plug-in unit to a
subrack .11
5.1 General .11
5.2 Alignment and/or electrical contact receptacle in the subrack guide rail for
printed board type plug-in units (width dimension t 4 x 5,08 mm).12
5.3 Alignment and/or electrical contact interface inspection dimensions.13
6 Arrangement overview: Subrack guide rail and printed board, 2,54 mm offset of the
printed board reference plane .14
6.1 General .14
6.2 Dimensions of the subrack guide rail with 2,54 mm offset of the printed board
reference plane .15
6.3 Reference plane for printed boards with 2,54 mm offset position.15
7 Dimensions used in the figures .16
Figure 1 – Relationship between the new IEC 60297-3 series and the old IEC 60297
series .5
Figure 2 – Keying of a plug-in unit in a subrack .7
Figure 3 – Subrack interface dimensions for keying .8
Figure 4 – Plug-in unit keying interface dimensions .8
Figure 5 – Key dimensions.9
Figure 6 – Programming of keys.9
Figure 7 – Front and/or rear subrack and plug-in unit keying chamber inspection
dimensions .10
Figure 8 – Alignment and/or electrical contact of a plug-in unit to a subrack .11
Figure 9 – Alignment and/or electrical contact receptacle position in the subrack .12
Figure 10 – Alignment and/or electrical contact interface inspection dimensions.13
Figure 11 – Subrack guide rail and printed board, 2,54 mm offset of the printed board
reference plane .14
Figure 12 – Dimensions of the subrack guide rail with 2,54 mm offset of the printed
board reference plane.15
Figure 13 – Reference plane for printed boards with 2,54 mm offset position.15

60297-3-103 ” IEC:2004(E) – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
___________
MECHANICAL STRUCTURES FOR ELECTRONIC EQUIPMENT –
DIMENSIONS OF MECHANICAL STRUCTURES
OF THE 482,6 mm (19 in) SERIES –
Part 3-103: Keying and alignment pin
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
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4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
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between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60297-3-103 has been prepared by subcommittee 48D:
Mechanical structures for electronic equipment, of IEC technical committee 48: Electro-
mechanical components and mechanical structures for electronic equipment.
This standard cancels and replaces IEC 60297-5-104 and 60297-5-105.
The text of this standard is based on following documents:
FDIS Report on voting
48D/301/FDIS 48D/308/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

– 4 – 60297-3-103 ” IEC:2004(E)
The IEC 60297-3 series consists of the following parts, under the general title Mechanical
structures for electronic equipment – Dimensions of mechanical structures of the 482,6 mm
(19 in) series
Part 3-101: Subracks and associated plug-in units
Part 3-102: Injector/extractor handle
Part 3-103: Keying and alignment pin
The committee has decided that the contents of this publication will remain unchanged until
the maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in
the data related to the specific publication. At this date, the publication will be
 reconfirmed;
 withdrawn;
 replaced by a revised edition, or
 amended.
A bilingual edition of this standard may be issued at a later date.

60297-3-103 ” IEC:2004(E) – 5 –
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