IEC 61076-2-101:2024

IEC 61076-2-101 ®
Edition 4.0 2024-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Connectors for electrical and electronic equipment – Product requirements –
Part 2-101: Circular connectors – Detail specification for M12 connectors with
screw-locking
Connecteurs pour équipements électriques et électroniques – Exigences de
produit –
Partie 2-101: Connecteurs circulaires – Spécification particulière pour les
connecteurs M12 à vis
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IEC 61076-2-101 ®
Edition 4.0 2024-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Connectors for electrical and electronic equipment – Product requirements –

Part 2-101: Circular connectors – Detail specification for M12 connectors with

screw-locking
Connecteurs pour équipements électriques et électroniques – Exigences de

produit –
Partie 2-101: Connecteurs circulaires – Spécification particulière pour les

connecteurs M12 à vis
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 31.220.10  ISBN 978-2-8322-4491-3

– 2 – IEC 61076-2-101:2024 © IEC 2024
CONTENTS
FOREWORD . 7
1 Scope . 10
2 Normative references . 10
3 Terms and definitions . 13
4 Technical information . 13
4.1 Recommended method of termination for rewirable connectors . 13
4.2 Connector coding, number of contacts, ratings and characteristics . 13
4.3 Systems of levels . 14
4.3.1 Performance level . 14
4.3.2 Compatibility levels, according to IEC 61076-1 . 14
4.4 Classification into climatic categories . 14
4.5 Creepage and clearance distances . 14
4.6 Current-carrying capacity . 14
4.7 Marking . 14
4.8 Safety aspects . 14
5 Dimensional information . 15
5.1 General . 15
5.2 Fixed connectors . 15
5.2.1 General . 15
5.2.2 Style DM . 16
5.2.3 Style EM . 17
5.2.4 Style FM . 18
5.2.5 Style GM . 18
5.2.6 Style HM . 19
5.2.7 Style EF . 19
5.2.8 Style FF . 20
5.2.9 Style GF . 21
5.2.10 Style HF . 21
5.3 Free connectors . 22
5.3.1 General . 22
5.3.2 Style JM . 23
5.3.3 Style KM . 23
5.3.4 Style LM . 24
5.3.5 Style MM and NM . 25
5.3.6 Style JF . 26
5.3.7 Style KF . 26
5.3.8 Style LF . 27
5.3.9 Style MF and NF . 28
5.4 Interface dimensions . 29
5.4.1 Pin front and side view A-coding up to 5-way . 29
5.4.2 Pin front and side view A-coding up to 8-way . 30
5.4.3 Pin front and side view A-coding up to 12-way . 32
5.4.4 Pin front and side view A-coding up to 17-way . 34
5.4.5 Pin front and side view up to B-coding . 37
5.4.6 Pin front and side view C-coding 3-way . 38
5.4.7 Pin front and side view C-coding 4-way . 39
5.4.8 Pin front and side view C-coding 5-way . 41

5.4.9 Pin front and side view C-coding 6-way . 42
5.4.10 Pin front and side view D-coding . 44
5.5 Engagement (mating) information . 46
5.6 Gauges – Sizing gauges and retention force gauges . 49
6 Characteristics . 50
6.1 General . 50
6.2 Pin assignment and other definitions . 50
6.3 Classification into climatic categories . 50
6.4 Electrical characteristics . 51
6.4.1 Rated insulation voltage – Rated impulse voltage – Pollution degree . 51
6.4.2 Voltage proof . 51
6.4.3 Current-carrying capacity . 52
6.4.4 Contact resistance . 53
6.4.5 Insulation resistance . 53
6.5 Mechanical characteristics . 53
6.5.1 Mechanical operation . 53
6.5.2 Insertion and withdrawal forces . 54
6.5.3 Contact retention in insert . 54
6.5.4 Polarizing and coding method . 54
6.6 Other characteristics . 54
6.6.1 Vibration (sinusoidal) . 54
6.6.2 Shock . 55
6.6.3 Degree of protection provided by enclosures (IP code) . 55
6.6.4 Shielding properties . 55
6.7 Environmental aspects – Marking of insulation material (plastics) . 55
7 Test schedule . 55
7.1 General . 55
7.1.1 Overview . 55
7.1.2 Climatic category . 55
7.1.3 Creepage and clearance distances . 55
7.1.4 Arrangement for contact resistance measurement . 56
7.1.5 Arrangement for dynamic stress tests . 56
7.1.6 Wiring of specimens . 58
7.2 Test schedules . 58
7.2.1 Basic (minimum) test schedule . 58
7.2.2 Full test schedule . 58
Annex A (informative) Diameter of the female connector body . 67
Annex B (informative) Orientation of cable outlet in relation to coding . 68
Annex C (normative) Dimensions of connector insert . 69
C.1 General . 69
C.2 Connector insert, male contacts, without locking thread . 69
C.3 Connector insert, male contacts, with M12 locking thread . 69
Bibliography . 71

Figure 1 – Fixed connector, male contacts, square flange front mounting . 16
Figure 2 – Fixed connector, male contacts, with wire / cable, single hole mounting
thread M16 × 1,5 . 17

– 4 – IEC 61076-2-101:2024 © IEC 2024
Figure 3 – Fixed connector, male contacts, with wire / cable, single hole mounting
thread M20 × 1,5 . 18
Figure 4 – Fixed connector, male contacts, with wire / cable, single hole mounting

thread M16 × 1,5, mounting orientation . 18
Figure 5 – Fixed connector, male contacts, with wire / cable, single hole mounting
thread M20 × 1,5, mounting orientation . 19
Figure 6 – Fixed connector, female contacts, with wire / cable, single hole mounting
thread M16 × 1,5 . 20
Figure 7 – Fixed connector, female contacts, with wire / cable, single hole mounting

thread M20 × 1,5 . 20
Figure 8 – Fixed connector, female contacts, with wire / cable, single hole mounting
thread M16 × 1,5, mounting orientation . 21
Figure 9 – Fixed connector, female contacts, with wire / cable, single hole mounting
thread M20 × 1,5, mounting orientation . 22
Figure 10 – Rewirable connector, male contacts, straight version, with locking nut . 23
Figure 11 – Rewirable connector, male contacts, right angled version, with locking nut . 24
Figure 12 – Non-rewirable connector, male contacts, straight version, with locking nut . 24
Figure 13 – Non-rewirable connector, male contacts, right angled version, with
locking nut . 25
Figure 14 – Rewirable connector, female contacts, straight version, with locking nut . 26
Figure 15 – Rewirable connector, female contacts, right angled version, with
locking nut . 27
Figure 16 – Non-rewirable connector, female contacts, straight version, with
locking nut . 27
Figure 17 – Non-rewirable connector, female contacts, right angled version, with

locking nut . 28
Figure 18 – Pin front and side view A-coding, up to 5-way . 29
Figure 19 – Contact position A-coding up to 5-way, front view . 30
Figure 20 – Pin front and side view A-coding, up to 8-way . 31
Figure 21 – Contact position A-coding up to 8-way, front view . 32
Figure 22 – Pin front and side view A-coding, up to 12-way . 33
Figure 23 – Contact position A-coding up to 12-way, front view. 34
Figure 24 – Pin front and side view A-coding, up to 17-way . 35
Figure 25 – Contact position A-coding up to 17-way, front view. 36
Figure 26 – Pin front and side view B-coding, up to 5-way . 37
Figure 27 – Contact position B-coding up to 5-way, front view . 38
Figure 28 – Pin front and side view C-coding, 3-way . 38
Figure 29 – Contact position C-coding 3-way, front view . 39
Figure 30 – Pin front and side view C-coding, 4-way . 40
Figure 31 – Contact position C-coding 4-way, front view . 41
Figure 32 – Pin front and side view C-coding, 5-way . 41
Figure 33 – Contact position C-coding 5-way, front view . 42
Figure 34 – Pin front and side view C-coding, 6-way . 43
Figure 35 – Contact position C-coding 6-way, front view . 44
Figure 36 – Pin front and side view D-coding . 44
Figure 37 – Contact position D-coding, front view . 45

Figure 38 – Engagement (mating) information . 46
Figure 39 – Gauge dimensions . 49
Figure 40 – Contact resistance arrangement . 56
Figure 41 – Dynamic stress test arrangement . 57
Figure A.1 – Diameter of the female connector body . 67
Figure B.1 – Orientation of cable outlet in relation to the coding – Free male
connectors according to Table 12 . 68
Figure C.1 – Connector insert, male contacts, without locking thread . 69
Figure C.2 – Connector insert, male contacts . 70

Table 1 – Ratings of connectors . 13
Table 2 – Styles of fixed connectors . 15
Table 3 – Dimensions of style DM, Figure 1 . 17
Table 4 – Dimensions of style EM, Figure 2 . 17
Table 5 – Dimensions of style FM, Figure 3 . 18
Table 6 – Dimensions of style GM, Figure 4 . 19
Table 7 – Dimensions of style HM, Figure 5 . 19
Table 8 – Dimensions of style EF, Figure 6 . 20
Table 9 – Dimensions of style FF, Figure 7 . 21
Table 10 – Dimensions of style GF, Figure 8 . 21
Table 11 – Dimensions of style HF, Figure 9 . 22
Table 12 – Styles of free connectors . 22
Table 13 – Dimensions of style JM, Figure 10 . 23
Table 14 – Dimensions of style KM, Figure 11 . 24
Table 15 – Dimensions of style LM, Figure 12 . 25
Table 16 – Dimensions of style MM and NM, Figure 13 . 25
Table 17 – Dimensions of style JF, Figure 14 . 26
Table 18 – Dimensions of style KF, Figure 15 . 27
Table 19 – Dimensions of style LF, Figure 16 . 28
Table 20 – Dimensions of style MF and NF, Figure 17 . 28
Table 21 – Dimensions for Figure 18. 29
Table 22 – Dimensions for Figure 20. 31
Table 23 – Dimensions for Figure 22. 33
Table 24 – Dimensions for Figure 24. 35
Table 25 – Dimensions for Figure 26. 37
Table 26 – Dimensions for Figure 28. 39
Table 27 – Dimensions for Figure 30. 40
Table 28 – Dimensions for Figure 32. 42
Table 29 – Dimensions for Figure 34. 43
Table 30 – Dimensions for Figure 36. 45
Table 31 – Connectors dimensions in mated and locked position . 47
Table 32 – Gauges . 50
Table 33 – Climatic category . 50

– 6 – IEC 61076-2-101:2024 © IEC 2024
Table 34 – Rated insulation voltage – Rated impulse voltage – Pollution degree . 51
Table 35 – Voltage proof . 52
Table 36 – Current-carrying capacity . 53
Table 37 – Number of mechanical operations . 54
Table 38 – Insertion and withdrawal forces . 54
Table 39 – Number of test specimens . 58
Table 40 – Test group P . 59
Table 41 – Test group AP . 60
Table 42 – Test group BP . 62
Table 43 – Test group CP . 63
Table 44 – Test group DP . 64
Table 45 – Test group EP . 65
Table 46 – Test group FP . 65
Table 47 – Test group NP . 66
Table A.1 – Diameter of the female connector body, dimension x . 67
Table C.1 – Dimensions of connector insert, Figure C.1 . 69
Table C.2 – Dimensions of connector insert, Figure C.2 . 70

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
CONNECTORS FOR ELECTRICAL AND ELECTRONIC EQUIPMENT –
PRODUCT REQUIREMENTS –
Part 2-101: Circular connectors –
Detail specification for M12 connectors with screw-locking

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
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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
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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) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights in
respect thereof. As of the date of publication of this document, IEC had not received notice of (a) patent(s), which
may be required to implement this document. However, implementers are cautioned that this may not represent
the latest information, which may be obtained from the patent database available at https://patents.iec.ch. IEC
shall not be held responsible for identifying any or all such patent rights.
IEC 61076-2-101 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.
This fourth edition cancels and replaces the third edition published in 2012. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) Technical specifications regarding dimensional information (Clause 5) and characteristics
(Clause 6) have been updated, and new subclauses have been added.
b) New style NF (free connectors) has been added.

– 8 – IEC 61076-2-101:2024 © IEC 2024
c) Fixed connectors with glass to metal seals (former styles WM, XM, YM, ZM and WF, XF, TF
and ZF) are no longer covered by this document: relevant definitions and requirements have
been removed.
d) The P-coding has been eliminated.
e) Annex B (informative) Steel conduit thread, sizes has been deleted and a new Annex B
(informative) Orientation of cable outlet in relation to coding has been added.
f) The dimension specification of former styles AM and BM have been moved into a new Annex
C (normative).
The text of this International Standard is based on the following documents:
Draft Report on voting
48B/3111/FDIS 48B/3129/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.
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/publications.
A list of all parts of IEC 61076 series, under the general title Connectors for electrical and
electronic equipment – Product requirements, 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, or
• revised.
IEC SC 48B – Electrical connectors IEC 61076-2-101 Ed 4
Specification available from:
IEC General secretariat or from the addresses shown on the inside
cover.
DETAIL SPECIFICATION in accordance with IEC 61076-1
Outline drawing Product description
Circular connectors M12
2- to 17-way
Male and female contacts
Male and female connectors
Rewirable – Non-rewirable
Free cable connectors
Straight and right angle connectors
Fixed connectors
Flange mounting
Single hole mounting
Connector insert
– 10 – IEC 61076-2-101:2024 © IEC 2024
CONNECTORS FOR ELECTRICAL AND ELECTRONIC EQUIPMENT –
PRODUCT REQUIREMENTS –
Part 2-101: Circular connectors –
Detail specification for M12 connectors with screw-locking

1 Scope
This part of IEC 61076 describes M12 screw-locking circular connectors with 2-way up to
17-way, for data transmission with frequencies up to 100 MHz and signal and power
transmission at up to 250 V rated voltage and up to 4 A rated current per contact.
These connectors consist of fixed and free connectors, either rewirable or non-rewirable.
Male connectors have round contacts, Ø 0,6 mm, Ø 0,76 mm, Ø 0,8 mm or Ø 1,0 mm according
to number of ways and coding, all contacts with the same size.
The different codings prevent the mating of differently coded male and female connectors.
NOTE 1 M12 is the dimension of the thread of the screw-locking mechanism of these circular connectors.
NOTE 2 These connectors are typically used for connecting industrial automation devices for process measurement
and control.
NOTE 3 Several other IEC standards are available covering additional styles of circular connectors with M12 × 1
screw-locking, see Bibliography.
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 – Part 581: Electromechanical
components for electronic equipment
IEC 60068-1, Environmental testing – Part 1: General and guidance
IEC 60352 (all parts), Solderless connections
IEC 60512-1, Connectors for electronic equipment – Tests and measurements – Part 1: General
IEC 60512-1-1, Connectors for electronic equipment – Tests and measurements – Part 1-1:
General examination – Test 1a: Visual examination
IEC 60512-1-2, Connectors for electronic equipment – Tests and measurements – Part 1-2:
General examination – Test 1b: Examination of dimension and mass
IEC 60512-1-100, Connectors for electronic equipment – Tests and measurements –
Part 1-100: General – Applicable publications

IEC 60512-2-1, Connectors for electronic equipment – Tests and measurements – Part 2-1:
Electrical continuity and contact resistance tests – Test 2a: Contact resistance – Millivolt level
method
IEC 60512-2-2, Connectors for electronic equipment – Tests and measurements – Part 2-2:
Electrical continuity and contact resistance tests – Test 2b: Contact resistance – Specified test
current method
IEC 60512-2-5, Connectors for electronic equipment – Tests and measurements – Part 2-5:
Electrical continuity and contact resistance tests – Test 2e: Contact disturbance
IEC 60512-3-1, Connectors for electronic equipment – Tests and measurements – Part 3-1:
Insulation tests – Test 3a: Insulation resistance
IEC 60512-4-1, Connectors for electronic equipment – Tests and measurements – Part 4-1:
Voltage stress tests – Test 4a: Voltage proof
IEC 60512-5-1, Connectors for electronic equipment – Tests and measurements – Part 5-1:
Current-carrying capacity tests – Test 5a: Temperature rise
IEC 60512-6-3, Connectors for electronic equipment – Tests and measurements – Part 6-3:
Dynamic stress tests – Test 6c: Shock
IEC 60512-6-4, Connectors for electronic equipment – Tests and measurements – Part 6-4:
Dynamic stress tests – Test 6d: Vibration (sinusoidal)
IEC 60512-9-1, Connectors for electronic equipment – Tests and measurements – Part 9-1:
Endurance tests – Test 9a: Mechanical operation
IEC 60512-9-2, Connectors for electronic equipment – Tests and measurements – Part 9-2:
Endurance tests – Test 9b: Electrical load and temperature
IEC 60512-11-1, Connectors for electrical and electronic equipment – Tests and measurements
– Part 11: Climatic tests – Section 1: Test 11a – Climatic sequence
IEC 60512-11-3, Connectors for electronic equipment – Tests and measurements – Part 11-3:
Climatic tests – Test 11c: Damp heat, steady state
IEC 60512-11-4, Connectors for electronic equipment – Tests and measurements – Part 11-4:
Climatic tests – Test 11d: Rapid change of temperature
IEC 60512-11-7, Connectors for electronic equipment – Tests and measurements – Part 11-7:
Climatic tests – Test 11g: Flowing mixed gas corrosion test
IEC 60512-11-9, Connectors for electronic equipment – Tests and measurements – Part 11-9:
Climatic tests – Test 11i: Dry heat
IEC 60512-11-10, Connectors for electronic equipment – Tests and measurements –
Part 11-10: Climatic tests – Test 11j: Cold
IEC 60512-11-12, Connectors for electronic equipment – Tests and measurements –
Part 11-12: Climatic tests – Test 11m: Damp heat, cyclic
IEC 60512-13-2, Connectors for electronic equipment – Tests and measurements – Part 13-2:
Mechanical operation tests – Test 13b: Insertion and withdrawal forces
IEC 60512-13-5, Connectors for electronic equipment – Tests and measurements – Part 13-5:
Mechanical operation tests – Test 13e: Polarizing and keying method

– 12 – IEC 61076-2-101:2024 © IEC 2024
IEC 60512-14-7, Electromechanical components for electronic equipment – Basic testing
procedures and measuring methods – Part 14: Sealing tests – Section 7: Test 14g: Impacting
water
IEC 60512-16-5, Connectors for electronic equipment – Tests and measurements – Part 16-5:
Mechanical tests on contacts and terminations – Test 16e: Gauge retention force (resilient
contacts)
IEC 60512-19-3, Electromechanical components for electronic equipment – Basic testing
procedures and measuring methods – Part 19: Chemical resistance tests – Section 3: Test 19c
– Fluid resistance
IEC 60512-23-3, Connectors for electrical and electronic equipment – Tests and measurements
– Part 23-3: Screening and filtering tests – Test 23c: Shielding effectiveness of connectors and
accessories – Line injection method
IEC 60512-29-100, Connectors for electronic equipment – Tests and measurements –
Part 29-100: Signal integrity tests up to 500 MHz on M12 style connectors – Tests 29a to 29g
IEC 60529:1989, Degrees of protection provided by enclosures (IP Code)
IEC 60529:1989/AMD1:1999
IEC 60529:1989/AMD2:2013
IEC 60664-1:2020, Insulation coordination for equipment within low-voltage systems – Part 1:
Principles, requirements and tests
IEC 60998-2-1, Connecting devices for low-voltage circuits for household and similar purposes
– Part 2-1: Particular requirements for connecting devices as separate entities with screw-type
clamping units
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 61076-2-010:2021, Connectors for electrical and electronic equipment – Product
requirements – Part 2-010: Circular connectors – Detail specification for connectors with outer
or inner push-pull locking mechanism, based on mating interfaces according to
IEC 61076-2-101, IEC 61076-2-109, IEC 61076-2-111 and IEC 61076-2-113
IEC 61076-2-012:2020, Connectors for electrical and electronic equipment – Product
Requirements – Part 2-012: Circular connectors – Detail specification for connectors with inner
p
...