EN IEC 61076-2-101:2025

Connectors for electrical and electronic equipment - Product requirements - Part 2-101: Circular connectors - Detail specification for M12 connectors with screw-locking

IEC 61076-2-101:2024 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. 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. 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).

Steckverbinder für elektronische Einrichtungen - Produktanforderungen - Teil 2-101: Rundsteckverbinder - Bauartspezifikation für Steckverbinder M12 mit Schraubverriegelung

Connecteurs pour équipements électriques et électroniques - Exigences de produit - Partie 2-101: Connecteurs circulaires - Spécification particulière pour les connecteurs M12 à vis

La IEC 61076-2-101:2024 décrit les connecteurs circulaires à verrouillage par vis M12 de 2 à 17 voies, pour la transmission de données à des fréquences allant jusqu’à 100 MHz et la transmission de signaux et de puissance à une tension assignée allant jusqu’à 250 V et à un courant assigné allant jusqu’à 4 A par contact. Ces connecteurs se composent d’embases et de fiches, démontables ou non. Les connecteurs mâles possèdent des contacts ronds, Ø 0,6 mm, Ø 0,76 mm, Ø 0,8 mm ou Ø 1,0 mm, suivant le nombre de voies et le détrompage, tous les contacts ayant la même taille. Les différents détrompages empêchent l’accouplement de connecteurs mâle et femelle ayant des détrompages différents. Cette édition inclut les modifications techniques majeures suivantes par rapport à l’édition précédente: les spécifications techniques concernant les informations dimensionnelles (Article 5) et les caractéristiques (Article 6) ont été mises à jour, et de nouveaux paragraphes ont été ajoutés; un nouveau modèle NF (fiches) a été ajouté; les embases avec joint verre-métal (anciens modèles WM, XM, YM et ZM, ainsi que WF, XF, TF et ZF) ne sont plus couvertes par le présent document: les définitions et exigences correspondantes ont été supprimées; le détrompage P a été supprimé; l’Annexe B (informative), Filetage des conduits en acier, tailles, a été supprimée et une nouvelle Annexe B (informative), Orientation de la sortie de câble par rapport au détrompage, a été ajoutée; la spécification des dimensions des anciens modèles AM et BM a été déplacée dans une nouvelle Annexe C (normative).

Konektorji za električno in elektronsko opremo - Zahteve za izdelek - 2-101. del: Okrogli konektorji - Podrobna specifikacija za konektorje M12 z vijačnim zaklepanjem (IEC 61076-2-101:2024)

Ta del standarda IEC 61076 opisuje od 2- do 17-polne okrogle konektorje M12 z vijačnim zaklepanjem za prenos podatkov s frekvencami do 100 MHz ter prenos signalov in električne energije pri nazivni napetosti do 250 V in nazivnem toku do 4 A na stik.
Ti konektorji so sestavljeni iz pritrjenih in prostih konektorjev z možnostjo ponovnega ožičenja ali brez te možnosti. Moški konektorji imajo okrogle kontakte s premerom 0,6 mm, 0,76 mm, 0,8 mm oziroma 1,0 mm glede na število polov in označitev, pri čemer so vsi kontakti enake velikosti.
Različne označitve preprečujejo spajanje različno označenih moških ali ženskih konektorjev.
OPOMBA 1: M12 je mera navoja mehanizma z vijačnim zaklepanjem teh okroglih konektorjev.
OPOMBA 2: Ti konektorji se običajno uporabljajo za povezovanje naprav za industrijsko avtomatizacijo na področju merjenja in krmiljenja.
OPOMBA 3: Na voljo je več drugih standardov IEC, ki obravnavajo dodatne tipe okroglih konektorjev M12 z vijačnim zaklepanjem (glej poglavje Literatura).

General Information

• Status: Published
• Publication Date: 09-Jan-2025
• ICS: 31.220.10 - Plug-and-socket devices. Connectors
• Technical Committee: CLC/SR 48B - Connectors
• Drafting Committee: IEC/SC 48B - IEC_SC_48B
• Current Stage: 6060 - Document made available - Publishing
• Start Date: 10-Jan-2025
• Due Date: 28-Jun-2024
• Completion Date: 10-Jan-2025
• Ref Project: SIST EN IEC 61076-2-101:2025 - Connectors for electrical and electronic equipment - Product requirements - Part 2-101: Circular connectors - Detail specification for M12 connectors with screw-locking(IEC 61076-2-101:2024)

Relations

• Replaces: EN 61076-2-101:2012 - Connectors for electronic equipment - Product requirements - Part 2-101: Circular connectors - Detail specification for M12 connectors with screw-locking
• Effective Date: 09-Aug-2022

Overview

EN IEC 61076-2-101:2025 (based on IEC 61076-2-101:2024) is the European detail specification for M12 circular connectors with screw‑locking. It covers fixed and free, rewirable and non‑rewirable M12 connectors with 2‑way up to 17‑way configurations for data transmission (up to 100 MHz) and signal/power use (rated up to 250 V and up to 4 A per contact). The fourth edition updates dimensional and performance requirements, adds a new free‑connector style (NF), removes certain glass‑to‑metal sealed styles and the P‑coding, and reorganizes annexes including a new orientation annex.

Key topics and requirements

• Connector range and ratings: 2–17 contacts, uniform contact diameters depending on number of ways and coding (Ø 0.6 mm, 0.76 mm, 0.8 mm or 1.0 mm), up to 250 V and 4 A per contact, data up to 100 MHz.
• Mechanical and dimensional specifications: Detailed styles for fixed and free connectors (DM, EM, … JM, KM, …), with new normative annex for former AM/BM style dimensions.
• Coding and compatibility: Multiple codings to prevent mismating; P‑coding eliminated in this edition. Compatibility is managed via performance and compatibility levels in accordance with IEC 61076‑1.
• Termination and assembly: Recommended methods of termination for rewirable connectors and requirements for rewirable vs non‑rewirable designs.
• Safety and electrical requirements: Creepage and clearance distances, insulation coordination, current‑carrying capacity, marking and safety aspects.
• Environmental and mechanical tests: Defines climatic categories, endurance, vibration/shock and sealing tests referencing IEC 60512 series and IP protection (IEC 60529) methods.
• Document changes: Removal of glass‑to‑metal sealed connector styles, addition of NF style, deletion of Annex B (steel conduit thread) and addition of informative Annex B on cable‑outlet orientation.

Applications

EN IEC 61076-2-101 is intended for designers, manufacturers and specifiers of M12 screw‑locking circular connectors used in:

• Industrial automation and control equipment
• Sensor and actuator connections
• Machine building and factory installations
• Signal and low‑power distribution where compact, robust circular connectors are required

The standard ensures interoperable, safe and tested connector designs suitable for combined data and signal/power transmission in demanding environments.

Who should use this standard

• Connector and cable assembly manufacturers
• OEM product designers and electrical engineers
• Test laboratories and conformity assessors
• Procurement/specification teams for industrial equipment

Related standards

Relevant normative references include IEC 61076‑1, the IEC 60512 test series, IEC 60529 (IP Code), IEC 60664‑1 and other IEC detail specifications for circular connectors (e.g., IEC 61076‑2‑010, ‑012, ‑109, ‑111, ‑113).

Standards Content (Sample)

SLOVENSKI STANDARD
01-marec-2025
Konektorji za električno in elektronsko opremo - Zahteve za izdelek - 2-101. del:
Okrogli konektorji - Podrobna specifikacija za konektorje M12 z vijačnim
zaklepanjem (IEC 61076-2-101:2024)
Connectors for electrical and electronic equipment - Product requirements - Part 2-101:
Circular connectors - Detail specification for M12 connectors with screw-locking(IEC
61076-2-101:2024)
Steckverbinder für elektronische Einrichtungen - Produktanforderungen - Teil 2-101:
Rundsteckverbinder - Bauartspezifikation für Steckverbinder M12 mit
Schraubverriegelung (IEC 61076-2-101:2024)
Connecteurs pour équipements électriques et électroniques - Exigences de produit -
Partie 2-101: Connecteurs circulaires - Spécification particulière pour les connecteurs
M12 à vis (IEC 61076-2-101:2024)
Ta slovenski standard je istoveten z: EN IEC 61076-2-101:2025
ICS:
31.220.10 Vtiči in vtičnice, konektorji Plug-and-socket devices.
Connectors
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 61076-2-101

NORME EUROPÉENNE
EUROPÄISCHE NORM January 2025
ICS 31.220.10 Supersedes EN 61076-2-101:2012
English Version
Connectors for electrical and electronic equipment - Product
requirements - Part 2-101: Circular connectors - Detail
specification for M12 connectors with screw-locking
(IEC 61076-2-101:2024)
Connecteurs pour équipements électriques et électroniques Steckverbinder für elektronische Einrichtungen -
- Exigences de produit - Partie 2-101: Connecteurs Produktanforderungen - Teil 2-101: Rundsteckverbinder -
circulaires - Spécification particulière pour les connecteurs Bauartspezifikation für Steckverbinder M12 mit
M12 à vis Schraubverriegelung
(IEC 61076-2-101:2024) (IEC 61076-2-101:2024)
This European Standard was approved by CENELEC on 2025-01-01. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 61076-2-101:2025 E

European foreword
The text of document 48B/3111/FDIS, future edition 4 of IEC 61076-2-101, prepared by SC 48B
"Electrical connectors" of IEC/TC 48 "Electrical connectors and mechanical structures for electrical
and electronic equipment" was submitted to the IEC-CENELEC parallel vote and approved by
CENELEC as EN IEC 61076-2-101:2025.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2026-01-31
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2028-01-31
document have to be withdrawn
This document supersedes EN 61076-2-101:2012 and all of its amendments and corrigenda (if any).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 61076-2-101:2024 was approved by CENELEC as a
European Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standard indicated:
IEC 61076-2-107:2010 NOTE Approved as EN 61076-2-107:2010 (not modified)
IEC 61076-2-109:2014 NOTE Approved as EN 61076-2-109:2014 (not modified)
IEC 61076-2-111:2017 NOTE Approved as EN IEC 61076-2-111:2018 (not modified)
IEC 61076-2-113:2017 NOTE Approved as EN 61076-2-113:2017 (not modified)
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
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.
NOTE 1  Where an International Publication has been modified by common modifications, indicated by (mod),
the relevant EN/HD applies.
NOTE 2  Up-to-date information on the latest versions of the European Standards listed in this annex is available
here: www.cencenelec.eu.
Publication Year Title EN/HD Year
IEC 60050-581 - International Electrotechnical Vocabulary - - -
Part 581: Electromechanical components
for electronic equipment
IEC 60068-1 - Environmental testing - Part 1: General EN 60068-1 -
and guidance
IEC 60352 series Solderless connections EN 60352 series
IEC 60512-1 - Connectors for electrical and electronic EN IEC 60512-1 -
equipment - Tests and measurements -
Part 1: Generic specification
IEC 60512-1-1 - Connectors for electronic equipment - EN 60512-1-1 -
Tests and measurements - Part 1-1:
General examination - Test 1a: Visual
examination
IEC 60512-1-2 - Connectors for electronic equipment - EN 60512-1-2 -
Tests and measurements - Part 1-2:
General examination - Test 1b:
Examination of dimension and mass
IEC 60512-1-100 - Connectors for electronic equipment - EN 60512-1-100 -
Tests and measurements - Part 1-100:
General - Applicable publications
IEC 60512-2-1 - Connectors for electronic equipment - EN 60512-2-1 -
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 - EN 60512-2-2 -
Tests and measurements - Part 2-2:
Electrical continuity and contact resistance
tests - Test 2b: Contact resistance -
Specified test current method
Publication Year Title EN/HD Year
IEC 60512-2-5 - Connectors for electronic equipment - EN 60512-2-5 -
Tests and measurements - Part 2-5:
Electrical continuity and contact resistance
tests - Test 2e: Contact disturbance
IEC 60512-3-1 - Connectors for electronic equipment - EN 60512-3-1 -
Tests and measurements - Part 3-1:
Insulation tests - Test 3a: Insulation
resistance
IEC 60512-4-1 - Connectors for electronic equipment - EN 60512-4-1 -
Tests and measurements - Part 4-1:
Voltage stress tests - Test 4a: Voltage
proof
IEC 60512-5-1 - Connectors for electronic equipment - EN 60512-5-1 -
Tests and measurements - Part 5-1:
Current-carrying capacity tests - Test 5a:
Temperature rise
IEC 60512-6-3 - Connectors for electronic equipment - EN 60512-6-3 -
Tests and measurements - Part 6-3:
Dynamic stress tests - Test 6c: Shock
IEC 60512-6-4 - Connectors for electronic equipment - EN 60512-6-4 -
Tests and measurements - Part 6-4:
Dynamic stress tests - Test 6d: Vibration
(sinusoidal)
IEC 60512-9-1 - Connectors for electronic equipment - EN 60512-9-1 -
Tests and measurements - Part 9-1:
Endurance tests - Test 9a: Mechanical
operation
IEC 60512-9-2 - Connectors for electronic equipment - EN 60512-9-2 -
Tests and measurements - Part 9-2:
Endurance tests - Test 9b: Electrical load
and temperature
IEC 60512-11-1 - Connectors for electrical and electronic EN IEC 60512-11-1 -
equipment - Tests and measurements -
Part 11-1: Climatic tests - Test 11a -
Climatic sequence
IEC 60512-11-3 - Connectors for electronic equipment - EN 60512-11-3 -
Tests and measurements - Part 11-3:
Climatic tests - Test 11c: Damp heat,
steady state
IEC 60512-11-4 - Connectors for electronic equipment - EN 60512-11-4 -
Tests and measurements - Part 11-4:
Climatic tests - Test 11d: Rapid change of
temperature
IEC 60512-11-7 - Connectors for electronic equipment - EN 60512-11-7 -
Tests and measurements - Part 11-7:
Climatic tests - Test 11g: Flowing mixed
gas corrosion test
IEC 60512-11-9 - Connectors for electronic equipment - EN 60512-11-9 -
Tests and measurements - Part 11-9:
Climatic tests - Test 11i: Dry heat
Publication Year Title EN/HD Year
IEC 60512-11-10 - Connectors for electronic equipment - EN 60512-11-10 -
Tests and measurements - Part 11-10:
Climatic tests - Test 11j: Cold
IEC 60512-11-12 - Connectors for electronic equipment - EN 60512-11-12 -
Tests and measurements - Part 11-12:
Climatic tests - Test 11m: Damp heat,
cyclic
IEC 60512-13-2 - Connectors for electronic equipment - EN 60512-13-2 -
Tests and measurements - Part 13-2:
Mechanical operation tests - Test 13b:
Insertion and withdrawal forces
IEC 60512-13-5 - Connectors for electronic equipment - EN 60512-13-5 -
Tests and measurements - Part 13-5:
Mechanical operation tests - Test 13e:
Polarizing and keying method
IEC 60512-14-7 - Electromechanical components for EN 60512-14-7 -
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 - EN 60512-16-5 -
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 EN 60512-19-3 -
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 EN IEC 60512-23-3 -
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 - EN 60512-29-100 -
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 EN 60529 1991
enclosures (IP Code)
- - + AC 1993
+ A1 1999 + A1 2000
+ A2 2013 + A2 2013
IEC 60664-1 2020 Insulation coordination for equipment EN IEC 60664-1 2020
within low-voltage supply systems - Part 1:
Principles, requirements and tests
Publication Year Title EN/HD Year
IEC 60998-2-1 - Connecting devices for low-voltage circuits EN 60998-2-1 -
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 EN 60999-1 -
conductors - Safety requirements for
screw-type and screwless-type clamping
units - Part 1: General requirements and
particular requirements for clamping units
for conductors from 0,2 mm2 up to 35 mm2
(included)
IEC 61076-1 2006 Connectors for electronic equipment - EN 61076-1 2006
Product requirements - Part 1: Generic
specification
+ A1 2019 + A1 2019
IEC 61076-2-010 2021 Connectors for electrical and electronic EN IEC 61076-2- 2021
equipment - Product requirements - Part 2- 010
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 EN IEC 61076-2- 2020
equipment - Product Requirements - Part 012
2-012: Circular connectors - Detail
specification for connectors with inner
push-pull locking based on M12 connector
interfaces according to IEC 61076-2-101,
IEC 61076-2-109, IEC 61076-2-111 and
IEC 61076-2-113
IEC 61984 2008 Connectors - Safety requirements and EN 61984 2009
tests
IEC 62197-1 - Connectors for electronic equipment - EN 62197-1 -
Quality assessment requirements - Part 1:
Generic specification
IEC/TR 63040:2016 2016 Guidance on clearances and creepage - -
distances in particular for distances equal
to or less than 2 mm - Test results of
research on influencing parameters
ISO 11469 2016 Plastics - Generic identification and EN ISO 11469 2016
marking of plastics products
ISO 21920-1 2021 Geometrical product specifications (GPS) - EN ISO 21920-1 2022
Surface texture: Profile - Part 1: Indication
of surface texture
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

IEC 61076-2-101:2024 © IEC 2024 – 3 –
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

IEC 61076-2-101:2024 © IEC 2024 – 5 –
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

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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

IEC 61076-2-101:2024 © IEC 2024 – 7 –
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
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
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9) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
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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
...