IEC 63171-5:2022

Connectors for electrical and electronic equipment - Part 5: Detail specification for 2-way M8 and M12 circular connectors, shielded or unshielded, free and fixed - Mechanical mating information, pin assignment and additional requirements for Type 5

IEC 63171-5:2022 refers to International Standards for test and measurement, environmental testing as well as solderless connections. This part of IEC 63171 describes 2-way shielded or unshielded circular connectors with IP65/IP67 M8 or M12 locking, typically used for balanced single-pair data transmission with frequencies up to 600 MHz and with current-carrying capacity up to 4 A, for use in areas with harsh environmental conditions. These connectors consist of fixed and free connectors, either rewirable or non-rewirable. Male connectors have square cross-section contacts.
The content of the corrigendum 1 (2024-11) has been included in this copy.

Connecteurs pour équipements électriques et électroniques - Partie 5: Spécification particulière pour les connecteurs circulaires M8 et M12 à 2 pôles, à fiches et embases écrantées ou non écrantées: informations d’accouplement mécanique, affectation des broches et exigences supplémentaires pour le type 5

L'IEC 63171-5:2022 fait référence aux Normes internationales pour les essais et les mesures, les essais environnementaux ainsi que les connexions sans soudure. Cette partie de l'IEC 63171 décrit les connecteurs circulaires blindés ou non blindés à 2 voies avec verrouillage IP65/IP67 M8 ou M12, généralement utilisés pour la transmission de données équilibrée à une seule paire avec des fréquences allant jusqu’à 600 MHz et avec une capacité de charge de courant allant jusqu’à 4 A, pour une utilisation dans des zones où les conditions environnementales sont difficiles. Ces connecteurs sont constitués de connecteurs fixes et libres, réengrenables ou non réenfrables. Les connecteurs mâles ont des contacts de section transversale carrée.
Le contenu du corrigendum 1 (2024-11) a été pris en considération dans cet exemplaire

General Information

• Status: Published
• Publication Date: 14-Sep-2022
• ICS: 31.220.10 - Plug-and-socket devices. Connectors
• Technical Committee: SC 48B - Electrical connectors
• Drafting Committee: PT 63171 - TC 48/SC 48B/PT 63171
• Current Stage: PPUB - Publication issued
• Start Date: 15-Sep-2022
• Completion Date: 16-Sep-2022

Relations

• Corrected By: IEC 63171-5:2022/COR1:2024 - Corrigendum 1 - Connectors for electrical and electronic equipment - Part 5: Detail specification for 2-way M8 and M12 circular connectors, shielded or unshielded, free and fixed - Mechanical mating information, pin assignment and additional requirements for Type 5
• Effective Date: 23-Feb-2024

Standards Content (Sample)

IEC 63171-5 ®
Edition 1.0 2022-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Connectors for electrical and electronic equipment –
Part 5: Detail specification for 2-way M8 and M12 circular connectors, shielded
or unshielded, free and fixed – Mechanical mating information, pin assignment
and additional requirements for Type 5

Connecteurs pour équipements électriques et ėlectroniques –
Partie 5: Spécification particulière pour les connecteurs circulaires M8 et M12 à
2 pôles, à fiches et embases écrantées ou non écrantées – Informations
d’accouplement mécanique, affectation des broches et exigences
supplémentaires pour le type 5

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IEC 63171-5 ®
Edition 1.0 2022-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Connectors for electrical and electronic equipment –

Part 5: Detail specification for 2-way M8 and M12 circular connectors, shielded

or unshielded, free and fixed – Mechanical mating information, pin assignment

and additional requirements for Type 5

Connecteurs pour équipements électriques et ėlectroniques –

Partie 5: Spécification particulière pour les connecteurs circulaires M8 et M12 à

2 pôles, à fiches et embases écrantées ou non écrantées – Informations

d’accouplement mécanique, affectation des broches et exigences

supplémentaires pour le type 5

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 31.220.10 ISBN 978-2-8322-5609-1

– 2 – IEC 63171-5:2022 © IEC 2022
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 9
2 Normative references . 9
3 Terms and definitions . 10
4 Common features and typical connector pair . 11
4.1 Systems of levels . 11
4.1.1 Performance levels . 11
4.1.2 Compatibility levels, according to IEC 61076-1 . 11
4.2 Pin assignment . 11
4.3 Codings . 11
4.4 Classification into climatic categories . 11
4.5 Creepage and clearance distances . 11
4.6 Current-carrying capacity . 11
4.7 Marking . 11
4.8 Characteristics . 11
5 Dimensional information . 12
5.1 General . 12
5.2 Isometric view and common features . 12
5.2.1 General . 12
5.2.2 Common features . 12
5.2.3 Reference system . 12
5.3 Engagement (mating) information – Engaging (mating) direction . 12
5.4 Fixed connectors . 13
5.4.1 Overview about styles for fixed connectors . 13
5.4.2 Interface dimensions – Fixed connectors M8 . 13
5.4.3 Interface dimensions – Fixed connectors M12 . 13
5.5 Free connectors . 13
5.5.1 Overview about styles for free connectors . 13
5.5.2 Style KF . 13
5.5.3 Style MF . 14
5.5.4 Interface dimensions – M8 free connector. 15
5.5.5 Interface dimensions – M12 free connector . 15
5.6 Interface dimensions – M8 male connector . 15
5.7 Interface dimensions – Female connectors M8 . 17
5.8 Interface dimensions – Male connector M12 . 19
5.9 Interface dimensions – Female connector M12 . 21
5.10 Terminations . 23
5.11 Mounting information for connectors . 23
5.12 Gauges . 24
5.12.1 Sizing gauges and retention force gauges . 24
5.12.2 Test panel (for voltage proof test) . 24
5.12.3 Test panel (for EMC/ crosstalk, etc.) . 24
6 Characteristics . 25
6.1 General . 25
6.2 Pin assignment and other definitions . 25

6.3 Classification into climatic categories . 25
6.4 Electrical characteristics . 25
6.4.1 Creepage and clearance distances . 25
6.4.2 Voltage proof . 25
6.4.3 Current-temperature derating . 25
6.4.4 Initial contact resistance – interface only (separable fixed and free
contact) . 26
6.4.5 Input to output DC resistance . 26
6.4.6 Input to output DC resistance unbalanced. 26
6.4.7 Initial insulation resistance . 26
6.5 Transmission characteristics . 26
6.5.1 General . 26
6.5.2 Insertion loss . 26
6.5.3 Return loss . 26
6.5.4 Propagation delay . 26
6.5.5 Transverse conversion loss . 26
6.5.6 Transverse conversion transfer loss . 26
6.5.7 Transfer impedance (shielded only) . 26
6.5.8 Coupling attenuation . 26
6.5.9 Power sum alien (exogenous) NEXT . 27
6.5.10 Power sum alien (exogenous) FEXT . 27
6.6 Mechanical characteristics . 27
6.6.1 Mechanical operation . 27
6.6.2 Effectiveness of connector coupling devices . 27
6.6.3 Insertion and withdrawal forces . 27
6.6.4 Polarization and coding method . 27
6.6.5 Dynamic stress . 27
7 Tests and test schedule . 27
7.1 General . 27
7.2 Contact resistance measurement . 27
7.3 Arrangement for vibration test . 28
7.4 Test procedures and measuring methods . 29
7.5 Preconditioning . 29
7.6 Test schedules . 29
7.7 Basic (minimum) test schedule. 29
7.8 Full test schedule . 29
Annex A (normative) Contact designation for balanced cabling M8 . 30
A.1 Cable connection with M8 . 30
Annex B (normative) Contact and pair designation for balanced cabling M12 . 31
B.1 Cable connection with M12 . 31
Bibliography . 32

Figure 1 – Relationships between the IEC 63171 series documents and their related

references . 7
Figure 2 – Type 5 connector overview . 8
Figure 3 – Engagement (mating) information. 12
Figure 4 – Free connector style KF . 13
Figure 5 – Free connector style MF . 14

– 4 – IEC 63171-5:2022 © IEC 2022
Figure 6 – M8 male connector interface . 16
Figure 7 – M8 female connector interface . 18
Figure 8 – M12 male connector interface . 20
Figure 9 – M12 female connector interface . 22
Figure 10 – Gauge dimensions . 24
Figure 11 – Contact resistance test arrangement . 27
Figure 12 – Dynamic stress test arrangement . 28
Figure A.1 – Mating side contact arrangement for balanced cabling with M8 . 30
Figure B.1 – Mating side contact arrangement for balanced cabling with M12 . 31

Table 1 – Dimensions of free connector style KF . 14
Table 2 – Dimensions of free connector style MF . 15
Table 3 – Dimensions of M8 male connector . 17
Table 4 – Dimensions of M8 female connector . 19
Table 5 – Dimensions of M12 male connector . 21
Table 6 – Dimensions of M12 female connector . 23
Table 7 – Gauges . 24
Table 8 – Creepage and clearance distances . 25
Table A.1 – Contact and pair designation for balanced cabling with M8 . 30
Table B.1 – Contact and pair designation for balanced cabling with M12 . 31

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
CONNECTORS FOR ELECTRICAL AND ELECTRONIC EQUIPMENT –

Part 5: Detail specification for 2-way M8 and M12 circular connectors,
shielded or unshielded, free and fixed – Mechanical mating information,
pin assignment and additional requirements for Type 5

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
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence between
any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
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
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
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.
IEC 63171-5 has been prepared by subcommittee 48B: Electrical connectors, of IEC technical
committee 48: Electrical connectors and mechanical structures for electrical and electronic
equipment. It is an International Standard.
The text of this International Standard is based on the following documents:
Draft Report on voting
48B/2973/FDIS 48B/2983/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.

– 6 – IEC 63171-5:2022 © IEC 2022
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/standardsdev/publications.
A list of all parts of IEC 63171 series, under the general title Connectors for electrical and
electronic equipment, can be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
INTRODUCTION
IEC 63171 is the base specification of the whole series. Subsequent specifications do not
duplicate information given in the base document, but list only additional requirements. For
complete specification regarding a component of a higher number document all lower numbered
documents shall be considered as well. Figure 1 shows the interrelation of the documents.

Figure 1 – Relationships between the IEC 63171 series documents
and their related references
NOTE IEC 63171-1 and IEC 63171-6 contain duplicate information, which is either equal to or better than the
minimum requirements of this document; such duplicate information will be removed in later editions.
This document refers to International Standards for test and measurement, environmental
testing as well as solderless connections.
A general overview about the connectors in this document is shown in Figure 2.

– 8 – IEC 63171-5:2022 © IEC 2022
IEC SC 48B – Electrical connectors IEC 63171-5 Ed. 1
Specification available from:
IEC General secretariat
or from the addresses shown on the inside cover.
Circular connectors for
data and power
applications with 2 ways
in a M8 and in a M12
style system
Male and female
connectors
Male and female
contacts
Fixed connector: M8 inner thread and
Fixed connector: M8 outer thread and male
Rewireable – Non-
female contacts
contacts rewireable
Free connector: M8 outer thread and
Free connector: M8 inner thread and
male contacts
female contacts
Free cable connectors
Straight and angled
connectors
Fixed connectors
Flange mounting
Single hole mounting
Fixed connector: M12 outer thread and Fixed connector: M12 inner thread and
male contacts female contacts
Free connector: M12 inner thread and Free connector: M12 outer thread and
female contacts male contacts
Figure 2 – Type 5 connector overview

CONNECTORS FOR ELECTRICAL AND ELECTRONIC EQUIPMENT –

Part 5: Detail specification for 2-way M8 and M12 circular connectors,
shielded or unshielded, free and fixed – Mechanical mating information,
pin assignment and additional requirements for Type 5

1 Scope
This part of IEC 63171 describes 2-way shielded or unshielded circular connectors with
IP65/IP67 M8 or M12 locking, typically used for balanced single-pair data transmission with
frequencies up to 600 MHz and with current-carrying capacity up to 4 A, for use in areas with
harsh environmental conditions.
These connectors consist of fixed and free connectors, either rewirable or non-rewirable. Male
connectors have square cross-section contacts.
M12 describes the dimensions of the styles and thread of the screw-locking mechanism
according to IEC 61076-2-101 of this size of circular connectors. M8 describes the dimensions
of the styles and thread of the screw-locking mechanism according to IEC 61076-2-104.
Use of alternative locking mechanisms according to IEC 61076-2-010 (push-pull locking) or
IEC 61076-2-011 (bayonet locking) is possible, within the corresponding size.
The coding provided by this document prevents the mating of accordingly coded male or
female connectors to other similarly sized interfaces covered by this or other documents.
This document covers Type 5 connectors. Each part of this series has the associated type
number equal to the number of the part in the series. All connectors in the IEC 63171 series
are deemed to provide the same functions as defined in IEC 63171:2021, using different
mechanical interfaces.
These Type 5 connectors are interoperable with Type 2 connectors according to IEC 63171-2,
except the locking and sealing system provided by the outer shell.
The shielded and unshielded connectors are interoperable for their internal transmission
performance and can be exchanged. The shielded version has improved EMC and coupling
properties.
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.
IEC 60050-581, International Electrotechnical Vocabulary (IEV) – Part 581: Electromechanical
components for electronic equipment
IEC 60352 (all parts), Solderless connections
IEC 60512-1, Connectors for electrical and electronic equipment – Tests and measurements –
Part 1: Generic specification
– 10 – IEC 63171-5:2022 © IEC 2022
IEC 60512-28-100:2019, Connectors for electrical and electronic equipment – Tests and
measurements – Part 28-100: Signal integrity tests up to 2 000 MHz – Tests 28a to 28g
IEC 60664-1, Insulation coordination for equipment within low-voltage supply systems – Part 1:
Principles, requirements and tests
IEC 60999-1, Connecting devices – Electrical copper conductors – Safety requirements for
screw-type and screwless-type clamping units – Part 1: General requirements and particular
2 2
requirements for clamping units for conductors from 0,2 mm up to 35 mm (included)
IEC 61076-1:2006, Connectors for electronic equipment - Product requirements – Part 1:
Generic specification
IEC 61076-1:2006/AMD1:2019
IEC 61076-2-101, Connectors for electronic equipment – Product requirements – Part 2-101:
Circular connectors – Detail specification for M12 connectors with screw-locking
IEC 61076-2-104, Connectors for electronic equipment – Product requirements – Part 2-104:
Circular connectors – Detail specification for circular connectors with M8 screw-locking or snap-
locking
IEC 61760-3, Surface mounting technology – Part 3: Standard method for the specification of
components for through hole reflow (THR) soldering
IEC TR 63040, Guidance on clearances and creepage distances in particular for distances
equal to or less than 2 mm – Test results of research on influencing parameters
IEC 63171:2021, Connectors for electrical and electronic equipment – Shielded or unshielded
free and fixed connectors for balanced single-pair data transmission with current carrying
capacity – General requirements and tests
IEC 63171-2, Connectors for electrical and electronic equipment – Part 2: Detail specification
for 2-way, shielded or unshielded, free and fixed connectors – Mechanical mating information,
pin assignment and additional requirements for Type 2
ISO/IEC 11801-1, Information technology – Generic cabling for customer premises – Part 1:
General requirements
ISO 21920-1:2021, Geometrical product specifications (GPS) – Surface texture: Profile – Part 1:
Indication of surface texture
IEEE 802.3, IEEE Standard for Ethernet
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 63171:2021,
IEC 60050-581, and IEC 60512-1 apply, as well as the following.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp

3.1
mounting orientation
circular mounting position of the connector in relation to the polarization of the mating interface
Note 1 to entry: Where the free connector has an angled cable entry (as opposed to a straight cable entry), the
angle between the cable entry direction and the polarization keyway should be specified.
4 Common features and typical connector pair
4.1 Systems of levels
4.1.1 Performance levels
According to 6.6.1.
4.1.2 Compatibility levels, according to IEC 61076-1
Connectors according to this document are intermatable according to IEC 61076-1.
Connectors according to this document are intermatable with connectors IEC 63171-2
according to IEC 61076-1, the resulting mated set being characterized by the IP20 degree of
protection of the I ingress protection of IEC 63171-2 connectors.
4.2 Pin assignment
Connectors according to this document are foreseen with the following assignments:
M8: 2 ways, see Annex A.
M12: 2 ways, see Annex B.
4.3 Codings
M12 connectors according to this document are foreseen with the following codings, see 5.8,
Figure 8 – male connectors – and Figure 9 – female connectors – for details:
SPE1
SPE2
The number and shape of contacts and all performance characteristics are identical.
4.4 Classification into climatic categories
Classification into climatic categories is specified in 6.3.
4.5 Creepage and clearance distances
See 6.4.1.
4.6 Current-carrying capacity
According to Level II of 5.4.3 of IEC 63171:2021.
4.7 Marking
The marking of the connector and the package shall be in accordance with 2.7 of
IEC 61076-1:2006.
4.8 Characteristics
Required arrangements for the connectors can be found in Annex A and Annex B.

– 12 – IEC 63171-5:2022 © IEC 2022
5 Dimensional information
5.1 General
Throughout this document, dimensions are in mm. Drawings are shown in the first angle
projection. The shape of the connectors may deviate from those given in the following drawings
as long as the specified dimensions are not influenced.
Missing dimensions for the styles are shown in IEC 61076-2-101 and IEC 61076-2-104.
Missing dimensions shall be chosen according to common characteristics and intended use.
5.2 Isometric view and common features
5.2.1 General
For interface dimensions see 5.6, 5.7, 5.8 and 5.9.
5.2.2 Common features
Not applicable.
5.2.3 Reference system
Not applicable.
5.3 Engagement (mating) information – Engaging (mating) direction
Arrows in Figure 3 indicate the mating direction.
Housing variant 1 Housing variant 2

Figure 3 – Engagement (mating) information
All dimensions for mated and locked position for the M8 style connectors are according to
IEC 61076-2-104.
All dimensions for mated and locked position for the M12 style connectors are according to
IEC 61076-2-101.
5.4 Fixed connectors
5.4.1 Overview about styles for fixed connectors
All styles of 61076-2-104 can be used for the fixed M8 style connectors.
All styles of 61076-2-101 can be used for the fixed M12 style connectors, except for WM, XM,
YM and ZM.
5.4.2 Interface dimensions – Fixed connectors M8
All implementations of 5.6 and 5.7 can be used for the fixed M8 style connectors.
5.4.3 Interface dimensions – Fixed connectors M12
All implementations of 5.8 and 5.9 can be used for the fixed M12 style connectors.
5.5 Free connectors
5.5.1 Overview about styles for free connectors
All styles of 61076-2-104 can be used for the free M8 style connectors.
All styles of 61076-2-101 can be used for the free M12 style connectors.
Angled styles KF and MF are shown only for the orientation of the mating face relatively to the
outer shell.
Locking nut with knurled ring or hexagonal ring upon agreement.
5.5.2 Style KF
Figure 4 shows style KF and Table 1 shows the dimensions for style KF.

Key
1 Sealing
Figure 4 – Free connector style KF

– 14 – IEC 63171-5:2022 © IEC 2022
Table 1 – Dimensions of free connector style KF
Dimensions in millimetres
Type Letter Minimum Nominal Maximum
A
B
M8 C Dimensions as in IEC 61076-2-104
D
E
A
B
M12 C Dimensions as in IEC 61076-2-101
D
E
5.5.3 Style MF
Figure 5 shows style MF and Table 2 shows the dimensions for style MF.

Key
1 Sealing
Figure 5 – Free connector style MF

Table 2 – Dimensions of free connector style MF
Dimensions in millimetres
Type Letter Minimum Nominal Maximum
A
B
M8 C Dimensions as in IEC 61076-2-104
D
E
A
B
M12 C Dimensions as in IEC 61076-2-101
D
E
5.5.4 Interface dimensions – M8 free connector
All implementations of 5.6 and 5.7 can be used for the free M8 style connectors.
5.5.5 Interface dimensions – M12 free connector
All implementations of 5.8 and 5.9 can be used for the free M12 style connectors.
5.6 Interface dimensions – M8 male connector
Figure 6 shows a connector with male contacts and Table 3 shows the related dimensions.

– 16 – IEC 63171-5:2022 © IEC 2022
Dimensions in millimetres
Figure 6 – M8 male connector interface

Table 3 – Dimensions of M8 male connector
Dimensions in millimetres
Letter Minimum Nominal Maximum
A1 4,8 4,85 4,9
A2 3 3,05 3,1
A3 5,65 5,8 5,95
A4 3,7 3,8 3,9
A5 1,69 1,75 1,81
a
A6 - 1,65 -
a
- 1,8 -
A7
A8 0,59 0,64 0,69
c
- - -
A9
c
- - -
A10
A11 - - 0,4
A12 - - 0,6
b, c
- - -
A13
b, c
- - -
A14
A15 1,8 1,95 2,1
A16 1,1 - -
c
- - -
A17
c
- - -
A18
c
- - -
A19
A20 1,29 1,34 1,39
A21 0,5 - -
A22 1,15 1,2 1,25
A23 6 - -
A24 - - 6,92
A25 - M8x1 -
A26 - - 3
A27 - 0,2 0,5
A28 2,3 2,35 2,4
a
Theoretically exact dimension.
b
Valid for contact zone.
c
See IEC 63171-2.
5.7 Interface dimensions – Female connectors M8
Figure 7 shows a connector with female contacts and Table 4 shows the related dimensions.

– 18 – IEC 63171-5:2022 © IEC 2022
Dimensions in millimetres
Figure 7 – M8 female connector interface

Table 4 – Dimensions of M8 female connector
Dimensions in millimetres
Letter Minimum Nominal Maximum
B1 4,65 4,7 4,75
B2 2,85 2,9 2,95
c
- - -
B3
B4 3,55 3,6 3,65
B5 1,54 1,59 1,64
a
- 1,55 -
B6
a
- 1,8 -
B7
B8 0,95 - -
c
- - -
B9
c
- - -
B10
B11 0,4 - -
B12 0,7 - -
b
0,6 - -
B13
c
- - -
B14
c
- - -
B15
c
- - -
B16
b
2,35 2,5 2,65
B17
B18 4,7 - -
B19 1,43 1,48 1,53
B20 - - 0,5
B21 0,5 - -
B22 1,25 1,3 1,35
B23 5,65 5,7 5,75
B24 - M8x1 -
B25 2,2 2,25 2,3
a
Theoretically exact dimensions.
b
Valid for contact zone.
c
See IEC 63171-2.
5.8 Interface dimensions – Male connector M12
Figure 8 shows a connector with male contacts and Table 5 shows the related dimensions.

– 20 – IEC 63171-5:2022 © IEC 2022
Dimensions in millimetres
Coding SPE1 Coding SPE2
Figure 8 – M12 male connector interface

Table 5 – Dimensions of M12 male connector
Dimensions in millimetres
Letter Minimum Nominal Maximum
A1 4,8 4,85 4,9
A2 3 3,05 3,1
A3 5,65 5,8 5,95
A4 3,7 3,8 3,9
A5 1,69 1,75 1,81
a
- -
A6 0,7
a
- -
1,8
A7
A8 0,59 0,64 0,69
A9 8,3 8,3 8,45
A10 2,3 2,35 2,4
A11 - - 0,4
A12 - - 0,6
A13 - - 3
A14 - 0,2 0,5
b
- -
A15 2,1
A16 1,1 - -
A17 10 - -
A18 10,2 10,5 10,5
A19 - M12x1 -
A20 1,29 1,34 1,39
A21 0,5 - -
A22 1,15 1,2 1,25
A23 6,95 7 7,05
A24 5,65 5,7 5,75
A25 4,15 4,2 4,25
A26 1,55 1,6 1,65
a
Theoretically exact dimension.
b
Valid for contact zone.
5.9 Interface dimensions – Female connector M12
Figure 9 shows a connector with female contacts and Table 6 shows the related dimensions.

– 22 – IEC 63171-5:2022 © IEC 2022
Dimensions in millimetres
Coding SPE1 Coding SPE2
Figure 9 – M12 female connector interface

Table 6 – Dimensions of M12 female connector
Dimensions in millimetres
Letter Minimum Nominal Maximum
B1 4,65 4,7 4,75
B2 2,85 2,9 2,95
B3 2,2 2,25 2,3
B4 3,55 3,6 3,65
B5 1,54 1,59 1,64
a
- -
B6 0,7
a
- -
1,8
B7
B8 0,95 - -
B9 8,15 8,25 8,25
B10 - M12x1 -
B11 0,4 - -
B12 0,7 - -
B13 - - 0,5
B14 1,25 1,3 1,35
B15 5,65 5,7 5,75
b
B16 2,35 2,5 2,65
B17 4,7 - -
B18 1,43 1,48 1,53
B19 4,35 4,4 4,45
B20 5,85 5,9 5,95
B21 7,15 7,2 7,25
B22 1,7 1,75 1,8
B23 0,05 0,1 0,15
a
Theoretically exact dimensions.
b
Valid for contact zone.
5.10 Terminations
The contact terminations shall be of the following types: screw, crimp, insulation piercing,
insulation displacement, press-in or solder.
Soldered terminations shall conform to IEC 61760-3.
Solderless terminations shall be in accordance with the relevant standard from the IEC 60352
series.
Screw type terminations shall be in accordance with IEC 60999-1.
5.11 Mounting information for connectors
For the mounting on panels see the respective information in 5.4 and 5.5.

– 24 – IEC 63171-5:2022 © IEC 2022
5.12 Gauges
5.12.1 Sizing gauges and retention force gauges
Material: tool steel, hardened
= Surface (clean and free of grease)
roughness according to ISO 21920-1:2021: Ra = 0,25 μm max

0,15 μm min
Figure 10 shows gauge dimensions.

Figure 10 – Gauge dimensions
Table 7 shows gauge information.
Table 7 – Gauges
a a
Gauge Mass Application ◘ a
l min Nom pin ◘
g mm mm mm
+0,005
P11 - Sizing 0,69 10
0,64
+1 –0,005
P12 10 Retention force 0,59 10
0 0
a
Instead of a square cross-sectional shape, a circular cross-sectional shape can also
be used.
5.12.2 Test panel (for voltage proof test)
For all styles of fixed connectors, the panel cutout shall be designed according to the styles in
5.4 with cutout dimensions 2 µm larger than the maximum tolerance of the fixed connector. The
test panel shall have the maximum thickness according to the style.
For free connectors, the connectors shall be wrapped into a foil of aluminum. The foil shall be
connected to PE.
5.12.3 Test panel (for EMC/ crosstalk, etc.)
Not applicable.
6 Characteristics
6.1 General
Compliance to the test schedules is intended to ensure the reliability of all performance
parameters, including transmission parameters, over the range of operating climatic conditions.
Stable and compliant contact resistance is a good indication of the stability of transmission
performance.
6.2 Pin assignment and other definitions
See Annex A and Annex B.
6.3 Classification into climatic categories
The temperature range and climatic category shall be compatible with ISO/IEC 11801-1
classification of a M I C E environment.
3 3 3 3
6.4 Electrical characteristics
6.4.1 Creepage and clearance distances
The permissible operating voltages depend upon the application and also on the specified
safety requirements.
Although insulation coordination is not required for these connectors for safety aspects, it is
required for electrical functional requirements. In general, for minimum values of creepage and
clearance distances, IEC 60664-1 shall apply, based upon the assigned voltage rating 50 V AC
and 60 V DC.
NOTE As indicated in IEC 60664-1, IEC TR 63040 provides an alternative and more precise dimensioning
procedure for clearances equal to or less than 2 mm.
The creepage and clearance distances that cover performance requirements in IEC 60664-1
may be reduced, based on IEC TR 63040.
The creepage
...