SIST EN 3646-006:2026

Aerospace series - Connectors, electrical, circular, bayonet coupling, operating temperature 175 °C or 200 °C continuous - Part 006: Receptacle, hermetic, jam-nut mounting - Product standard

This document specifies the characteristics of hermetic jam-nut mounted receptacles in the family of bayonet coupling circular connectors, intended for use in an operating temperature range of – 65 °C to 175 °C or 200 °C continuous.
It is applicable to models specified in Table 4.
For plugs and protective covers, see EN 3646-008 and EN 3646-009 respectively.

Luft- und Raumfahrt - Elektrische Rundsteckverbinder mit Bajonettkupplung, Betriebstemperatur 175 °C oder 200 °C konstant - Teil 006: Hermetischer fester Steckverbinder mit Mutternbefestigung - Produktnorm

Dieses Dokument legt die Eigenschaften von hermetischen festen Steckverbindern mit Mutternbefestigung aus der Familie der Rundsteckverbinder mit Bajonettkupplung fest, die für den Einsatz im Betriebstemperaturbereich von −65 °C bis 175 °C oder 200 °C konstant vorgesehen sind.
Es ist für die in Tabelle 4 angegebene Bauform anwendbar.
Für zugehörige freie Steckverbinder und Schutzkappen siehe EN 3646 008 bzw. EN 3646 009.

Série aérospatiale - Connecteurs électriques circulaires à accouplement par baïonenettes, température d'utilisation 175 °C ou 200 °C continu - Partie 006: Embasse hermétique à fixation par écrou - Norme de produit

Le présent document spécifie les caractéristiques des embases hermétiques à fixation par écrou de la famille des connecteurs circulaires à accouplement par baïonnettes, destinés à une utilisation dans une plage de températures comprises entre −65 °C et 175 °C ou 200 °C continu.
Il est applicable au modèle spécifié dans le Tableau 4.
Pour les fiches et les bouchons de vol, voir respectivement l’EN 3646-008 et l’EN 3646-009.

Aeronavtika - Konektorji, električni, okrogli, bajonetno sklapljanje, stalna delovna temperatura 175 °C ali 200 °C - 006. del: Podloga, hermetična, pritrjena z matico - Standard za proizvod

Ta dokument določa lastnosti hermetičnih vtičnic z montažo z matico v družini okroglih konektorjev z bajonetnim spojem, namenjenih za uporabo v temperaturnem območju od – 65 °C do 175 °C ali 200 °C neprekinjeno.
Uporablja se za modele, določene v Tabeli 4.
Za vtiče in zaščitne pokrove glej EN 3646-008 in EN 3646-009.

General Information

• Status: Published
• Public Enquiry End Date: 28-May-2024
• Publication Date: 30-Mar-2026
• ICS: 31.220.10 - Plug-and-socket devices. Connectors
• ICS: 49.060 - Aerospace electric equipment and systems
• Technical Committee: I13 - Imaginarni 13
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 18-Mar-2026
• Due Date: 23-May-2026
• Completion Date: 31-Mar-2026
• Ref Project: EN 3646-006:2026 - Aerospace series - Connectors, electrical, circular, bayonet coupling, operating temperature 175 °C or 200 °C continuous - Part 006: Receptacle, hermetic, jam-nut mounting - Product standard

Relations

• Refers: SIST EN 3646-001:2016 - Aerospace series - Connectors, electrical, circular, bayonet coupling, operating temperature 175 °C or 200 °C continuous - Part 001: Technical specification
• Effective Date: 18-Mar-2026
• Referred By: SIST EN 3646-002:2026 - Aerospace series - Connectors, electrical, circular, bayonet coupling, operating temperature 175 °C or 200 °C continuous - Part 002: Specification of performance and contact arrangements
• Effective Date: 18-Mar-2026
• Referred By: SIST EN 3155-002:2024 - Aerospace series - Electrical contacts used in elements of connection - Part 002: List and utilization of contacts
• Effective Date: 04-Mar-2026
• Referred By: SIST EN 3660-066:2017 - Aerospace series - Cable outlet accessories for circular and rectangular electrical and optical connectors - Part 066: Cable outlet, style K, 90°, for heat shrinkable boot, shielded, sealed - Product standard
• Effective Date: 04-Mar-2026
• Referred By: SIST EN 3660-034:2017 - Aerospace series - Cable outlet accessories for circular and rectangular electrical and optical connectors - Part 034: Memory metal rings for the attachment of screens - Product standard
• Effective Date: 04-Mar-2026
• Referred By: SIST EN 3646-009:2015 - Aerospace series - Connectors, electrical, circular, bayonet coupling, operating temperature 175 °C or 200 °C continuous - Part 009: Protective cover for receptacle - Product standard
• Effective Date: 04-Mar-2026
• Referred By: SIST EN 3660-002:2009 - Aerospace series - Cable outlet accessories for circular and rectangular electrical and optical connectors - Part 002: Index of product standards
• Effective Date: 04-Mar-2026
• Referred By: SIST EN 3646-008:2009 - Aerospace series - Connectors, electrical, circular, bayonet coupling, operating temperature 175 °C or 200 °C continuous - Part 008: Plug - Product standard
• Effective Date: 04-Mar-2026
• Referred By: SIST EN 3646-002:2009 - Aerospace series - Connectors, electrical, circular, bayonet coupling, operating temperature 175 °C or 200 °C continuous - Part 002: Specification of performance and contact arrangements
• Effective Date: 04-Mar-2026
• Referred By: SIST EN 3646-009:2009 - Aerospace series - Connectors, electrical, circular, bayonet coupling, operating temperature 175 °C or 200 °C continuous - Part 009: Protective cover for receptacle - Product standard
• Effective Date: 04-Mar-2026
• Referred By: SIST EN 3660-002:2016 - Aerospace series - Cable outlet accessories for circular and rectangular electrical and optical connectors - Part 002: Index of product standards
• Effective Date: 04-Mar-2026
• Revises: SIST EN 3646-006:2018 - Aerospace series - Connectors, electrical, circular, bayonet coupling, operating temperature 175 °C or 200 °C continuous - Part 006: Receptacle, hermetic, jam-nut mounting - Product standard
• Effective Date: 25-Oct-2023

Overview

SIST EN 3646-006:2026 is a European standard published by CEN for the aerospace sector. It specifies the requirements for hermetic, jam-nut mounted receptacles within the family of circular electrical connectors with bayonet coupling, designed for continuous operation at temperatures between –65 °C and either 175 °C or 200 °C. These connectors are essential in high-reliability aerospace applications where secure, hermetically sealed connections must withstand harsh environments and critical temperature ranges. This standard replaces EN 3646-006:2018 and features updates including the possibility to use locking wire on the jam nut and revised technical illustrations.

Key Topics

• Scope and Purpose: Describes connectors intended for use in the aerospace industry, specifically hermetic receptacles with jam-nut mounting, suitable for demanding environments.
• Temperature Range: Supports continuous operation at –65 °C to 175 °C or 200 °C, ensuring compatibility with modern aircraft and space systems.
• Design Features:
  • Hermetic sealing to prevent ingress of moisture and contaminants.
  • Jam-nut mounting system for secure panel installation.
  • Bayonet coupling for quick, reliable mate and unmate cycles.
  • Six equally spaced holes in the jam nut for optional locking wire.
• Marking and Identification: Defines marking requirements for traceability, including manufacturer name, part number, and date of manufacture.
• Dimensional and Mechanical Requirements: Specifies dimensions, tolerances, material, surface treatment, and attachment torque for mounting.
• Interchangeability: Outlines combinations with matching plugs and protective covers (referencing EN 3646-008 and EN 3646-009).

Applications

SIST EN 3646-006:2026 connectors are vital in aerospace electric equipment and systems where robust and hermetic electrical connections are required. Typical applications include:

• Aircraft Avionics: Providing reliable signal and power transmission in cockpit instruments, navigation systems, and control electronics.
• Spacecraft and Satellites: Ensuring hermetic connectivity in highly sensitive environments involving exposure to vacuum and radiation.
• Military and Defense: Used in mission-critical systems that demand high performance in extreme temperatures and vibration.
• Test and Measurement Equipment: Suitable for ground support testing instrumentation where maintaining seal integrity is critical.
• Harsh Industrial Environments: While primarily aimed at aerospace, these connectors can also support demanding industrial use cases needing hermetic and high-temperature capabilities.

Related Standards

• EN 3646-001: Technical specification for bayonet coupling circular connectors.
• EN 3646-002: Specification of connector performance and contact arrangements.
• EN 3646-008: Details on compatible plug connectors.
• EN 3646-009: Protective covers for receptacle connectors.
• ISO 3161: General requirements and limit dimensions for UNJ threads, applicable to the connector's mechanical interface.

Practical Value

Adhering to SIST EN 3646-006:2026 ensures interoperability and safety in aerospace connector design. Manufacturers, engineers, and procurement professionals benefit from:

• Guaranteed Compatibility: Ensured fit with related connector parts and compliance within broader electrical systems.
• Enhanced Reliability: Specifications cover mechanical robustness, environmental sealing, and identification, reducing the risk of failure.
• Streamlined Certification: Global industry acceptance simplifies procurement and integration for aerospace projects.
• Up-to-Date Requirements: Compliance with the latest revision assures alignment with best practices and evolving safety standards.

By referencing SIST EN 3646-006:2026, organizations demonstrate commitment to quality and reliability in aerospace electrical connector systems, supporting both current and future high-performance applications.

Standards Content (Sample)

SLOVENSKI STANDARD
01-maj-2026
Aeronavtika - Konektorji, električni, okrogli, bajonetno sklapljanje, stalna delovna
temperatura 175 °C ali 200 °C - 006. del: Podloga, hermetična, pritrjena z matico -
Standard za proizvod
Aerospace series - Connectors, electrical, circular, bayonet coupling, operating
temperature 175 °C or 200 °C continuous - Part 006: Receptacle, hermetic, jam-nut
mounting - Product standard
Luft- und Raumfahrt - Elektrische Rundsteckverbinder mit Bajonettkupplung,
Betriebstemperatur 175 °C oder 200 °C konstant - Teil 006: Hermetischer fester
Steckverbinder mit Mutternbefestigung - Produktnorm
Série aérospatiale - Connecteurs électriques circulaires à accouplement par
baïonenettes, température d'utilisation 175 °C ou 200 °C continu - Partie 006: Embasse
hermétique à fixation par écrou - Norme de produit
Ta slovenski standard je istoveten z: EN 3646-006:2026
ICS:
31.220.10 Vtiči in vtičnice, konektorji Plug-and-socket devices.
Connectors
49.060 Letalska in vesoljska Aerospace electric
električna oprema in sistemi equipment and systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 3646-006
EUROPEAN STANDARD
NORME EUROPÉENNE
February 2026
EUROPÄISCHE NORM
ICS 49.060 Supersedes EN 3646-006:2018
English Version
Aerospace series - Connectors, electrical, circular, bayonet
coupling, operating temperature 175 °C or 200 °C
continuous - Part 006: Receptacle, hermetic, jam-nut
mounting - Product standard
Série aérospatiale - Connecteurs électriques circulaires Luft- und Raumfahrt - Elektrische Rundsteckverbinder
à accouplement par baïonnettes, température mit Bajonettkupplung, Betriebstemperatur 175 °C oder
d'utilisation 175 °C ou 200 °C continu - Partie 006 : 200 °C konstant - Teil 006: Hermetischer fester
Embase hermétique à fixation par écrou -Norme de Steckverbinder mit Mutternbefestigung - Produktnorm
produit
This European Standard was approved by CEN on 3 November 2025.

CEN 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 CEN
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 CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2026 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 3646-006:2026 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Required characteristics . 4
4.1 Dimensions and mass . 4
4.2 Tightening torque of attachment nut . 6
4.3 Panel cut-out . 6
4.4 Material and surface treatment . 7
4.5 Main general characteristics . 7
4.6 Possible combinations of plugs and receptacles . 7
5 Designation . 8
6 Marking . 8
6.1 General. 8
6.2 Marking on the product . 8
6.3 Marking on the individual packaging . 8
7 Technical specification . 9
Bibliography . 10

European foreword
This document (EN 3646-006:2026) has been prepared by ASD-STAN.
After enquiries and votes carried out in accordance with the rules of this Association, this document has
received the approval of the National Associations and the Official Services of the member countries of
ASD-STAN, prior to its presentation to CEN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by August 2026, and c
...