SIST EN 3645-002:2024

Aerospace series - Connectors, electrical, circular, scoop-proof, triple start threaded coupling, operating temperature 175 °C or 200 °C continuous - Part 002: Specification of performance and contact arrangements

This document defines the performances and contact arrangements for threaded ring coupling circular connectors, fire resistant or non-fire resistant, intended for use in a temperature range from -65 °C to 175 °C or 200 °C continuous.

Luft- und Raumfahrt - Elektrische Rundsteckverbinder, kontaktgeschützt, dreigängige Gewinde-Schnellkupplung, Betriebstemperatur 175 °C oder 200 °C konstant - Teil 002: Leistungsdaten und Kontaktanordnungen

Dieses Dokument legt die Leistungsanforderungen und Kontaktanordnungen für Rundsteckverbinder mit Gewinde-Schnellkupplung, feuerbeständig oder nicht feuerbeständig fest, die für den Einsatz in einem Temperaturbereich von −65 °C bis 175 °C konstant oder 200 °C konstant vorgesehen sind.

Série aérospatiale - Connecteurs électriques circulaires, à contacts protégés, à accouplement par filetage, à pas rapide à trois filets, température d’utilisation 175 °C ou 200 °C continu - Partie 002: Spécification de performances et d’arrangements des contacts

Le présent document spécifie les performances et les arrangements de contacts des connecteurs circulaires à accouplement par bague filetée, résistant au feu ou non, destinés à être utilisés dans une plage de températures comprises entre −65 °C et 175 °C, ou 200 °C continu.

Aeronavtika - Konektorji, električni, okrogli, zaščiteni kontakt, hitra spojka z navojem, stalna delovna temperatura 175 °C ali 200 °C - 002. del: Specifikacija lastnosti in razporeditev kontaktov

Ta dokument določa lastnosti in razporeditev kontaktov za okrogle konektorje, priključene z navojnim obročkom, ognjevzdržne ali ne, za uporabo pri temperaturah med −65 °C in 175 °C ali pri stalni temperaturi 200 °C.

General Information

• Status: Published
• Public Enquiry End Date: 11-Oct-2022
• Publication Date: 03-Mar-2024
• 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: 29-Feb-2024
• Due Date: 05-May-2024
• Completion Date: 04-Mar-2024
• Ref Project: EN 3645-002:2024 - Aerospace series - Connectors, electrical, circular, scoop-proof, triple start threaded coupling, operating temperature 175 °C or 200 °C continuous - Part 002: Specification of performance and contact arrangements

Relations

• Revised: SIST EN 3645-002:2015 - Aerospace series - Connectors, electrical, circular, scoop-proof, triple start threaded coupling, operating temperature 175 °C or 200 °C continuous - Part 002: Specification of performance and contact arrangements
• Effective Date: 19-Jan-2023

Overview

EN 3645-002:2024 is a CEN aerospace standard that specifies the performance and contact arrangements for circular, scoop‑proof electrical connectors with a triple‑start threaded (threaded ring) coupling. It covers both fire‑resistant and non‑fire‑resistant connector variants intended for continuous operation in the temperature range −65 °C to 175 °C or 200 °C. This part (Part 002) defines functional requirements, contact layouts and class descriptions for connector models used in aircraft and aerospace systems. The family is derived from and is intermateable with MIL‑DTL‑38999 Series III.

Key Topics

• Scope and applicability: Performance limits, contact arrangements and operating temperatures (175 °C or 200 °C continuous).
• Connector classes and coatings: Multiple models described (e.g., cadmium‑plated, zinc‑nickel plated, nickel‑plated, passivated stainless steel, nickel fluorocarbon polymer) with specified salt spray resistance and mating cycles.
• Material and plating requirements: Includes a zero hexavalent chromium requirement for some zinc‑nickel finishes and a listing of hexavalent chromium compounds (Table 2).
• Environmental and electrical conditions: Climatic, mechanical and electrical operating conditions and permissible cable types are defined to ensure reliable performance in aerospace environments.
• Interchangeability and compatibility: Guidance on combinations of plugs/receptacles, protective covers, and sealing plugs; connectors are intended to be intermateable with the established MIL standard family.
• Productization and documentation: Includes type codes, polarization, housing sizes, contact arrangements, contacts, rear accessories, tooling and assembly/wiring instructions.
• Updates from previous edition: EN 3645‑002:2024 supersedes EN 3645‑002:2015 and includes technical updates such as coating model descriptions and shielding effectiveness entries.

Applications

EN 3645‑002:2024 is used by:

• Aerospace OEMs and subcontractors specifying aerospace connectors, circular multi‑pin connectors and hermetic feedthroughs.
• Design and electrical engineers selecting connectors for high‑temperature zones (engines, auxiliary power units, environmental control systems).
• Procurement and quality teams requiring standardized contact arrangements, corrosion resistance and plating compliance (e.g., zero hexavalent chromium).
• Test laboratories and maintenance/repair organizations verifying mating cycles, salt spray performance and fire‑resistance.
• Defense primes and avionics suppliers seeking MIL‑compatible connector solutions.

Keywords: EN 3645‑002:2024, aerospace connectors, circular connectors, threaded ring coupling, triple‑start coupling, fire‑resistant connectors, contact arrangements, high‑temperature connectors, MIL‑DTL‑38999 intermateable.

Related Standards

• EN 3645‑001 (Technical specification)
• EN 3645 Parts 003–013 (Product standards: receptacles, protective covers, plugs, hermetic variants)
• EN 2591‑209, EN 3155‑001, EN 3197, EN 4529‑002

Standards Content (Sample)

SLOVENSKI STANDARD
01-april-2024
Aeronavtika - Konektorji, električni, okrogli, zaščiteni kontakt, hitra spojka z
navojem, stalna delovna temperatura 175 °C ali 200 °C - 002. del: Specifikacija
lastnosti in razporeditev kontaktov
Aerospace series - Connectors, electrical, circular, scoop-proof, triple start threaded
coupling, operating temperature 175 °C or 200 °C continuous - Part 002: Specification of
performance and contact arrangements
Luft- und Raumfahrt - Elektrische Rundsteckverbinder, kontaktgeschützt, dreigängige
Gewinde-Schnellkupplung, Betriebstemperatur 175 °C oder 200 °C konstant - Teil 002:
Leistungsdaten und Kontaktanordnungen
Série aérospatiale - Connecteurs électriques circulaires, à contacts protégés, à
accouplement par filetage, à pas rapide à trois filets, température d’utilisation 175 °C ou
200 °C continu - Partie 002: Spécification de performances et d’arrangements des
contacts
Ta slovenski standard je istoveten z: EN 3645-002:2024
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 3645-002
EUROPEAN STANDARD
NORME EUROPÉENNE
February 2024
EUROPÄISCHE NORM
ICS 49.060 Supersedes EN 3645-002:2015
English Version
Aerospace series - Connectors, electrical, circular, scoop-
proof, triple start threaded coupling, operating
temperature 175 °C or 200 °C continuous - Part 002:
Specification of performance and contact arrangements
Série aérospatiale - Connecteurs électriques Luft- und Raumfahrt - Elektrische Rundsteckverbinder,
circulaires, à contacts protégés, à accouplement par kontaktgeschützt, dreigängige Gewinde-
filetage, à pas rapide à trois filets, température Schnellkupplung, Betriebstemperatur 175 °C oder 200
d'utilisation 175 °C ou 200 °C continu - Partie 002: °C konstant - Teil 002: Leistungsdaten und
Spécification de performances et d'arrangements des Kontaktanordnungen
contacts
This European Standard was approved by CEN on 15 October 2023.

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
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 3645-002:2024 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 6
4 Description and codification of class . 6
5 Operating conditions . 8
5.1 Combinations of plugs and receptacles . 8
5.2 Combinations of protective covers and connectors . 9
5.3 Permissible cables . 9
5.4 Operating characteristics . 10
5.4.1 Electrical conditions . 10
5.4.2 Climatic conditions . 12
5.4.3 Mechanical conditions . 12
6 Type codes . 12
7 Polarization . 13
8 Housing sizes and contact arrangements. 14
9 Contact arrangements . 17
10 Contacts . 52
11 Sealing plugs . 53
12 Rear accessories . 53
13 Tooling . 53
14 Assembly and wiring instructions . 53
Bibliography . 54

European foreword
This document (EN 3645-002:2024) has been prepared by the Aerospace and Defence Industries
Association of Europe — Standardization (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 2024, and conflicting national standards shall be
withdrawn at the latest by August 2024.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 3645-002:2015
EN 3645-002:2023 includes the following significant technical changes with respect to
EN 3645-002:2015:
— description of connector models V and Z in Table 1 updated;
— Table 2 — Hexavalent chromium compound list added;
— values for models K and Y in Table 9 (shielding effectiveness) updated;
— Table 12 – Housing size and contact arrangements updated.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: 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 the United
Kingdom.
Introduction
This family of connectors is derived from MIL-DTL-38999 series III, with which it is intermateable and
interchangeable.
1 Scope
This document specifies the performances and contact arrangements for threaded ring coupling circular
connectors, fire resistant or non-fire resistant, intended for use in a temperature range from −65 °C to
175 °C or 200 °C continuous.
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.
EN 2591-209, Aerospace series — Elements of electrical and optical connection — Test methods —
Part 209: Current temperature derating
EN 3155-001:2016, Aerospace series — Electrical contacts used in elements of connection — Part 001:
Technical Specification
EN 3197, Aerospace series — Design and installation of aircraft electrical and optical interconnection
systems
EN 3645-001, Aerospace series — Connectors, electrical, circular, scoop-proof, triple start threaded
coupling, operating temperature 175 °C or 200 °C continuous — Part 001: Technical specification
EN 3645-003, Aerospace series — Connectors, electrical, circular, scoop-proof, triple start threaded
coupling, operating temperature 175 °C or 200 °C continuous — Part 003: Receptacle square flange
mounting — Product standard
EN 3645-004, Aerospace series — Connectors, electrical, circular, scoop-proof, triple start threaded
coupling, operating temperature 175 °C or 200 °C continuous — Part 004: Receptacle, hermetic, square
flange mounting — Product standard
EN 3645-005, Aerospace series — Connectors, electrical, circular, scoop-proof, triple start threaded
coupling, operating temperature 175 °C or 200 °C continuous — Part 005: Receptacle, hermetic, round
flange, solder mounting — Product standard
EN 3645-006, Aerospace series — Connectors, electrical, circular, scoop-proof, triple start threaded
coupling, operating temperature 175 °C or 200 °C continuous — Part 006: Protective cover for receptacle —
Product standard
EN 3645-007, Aerospace series — Connectors, electrical, circular, scoop-proof, triple start threaded
coupling, operating temperature 175 °C or 200 °C continuous — Part 007: Protective cover for plug —
Product standard
EN 3645-008, Aerospace series — Connectors, electrical, circular, scoop-proof, triple start threaded
coupling operating temperature 175 °C or 200 °C continuous — Part 008: Non release plug with grounding
ring — Product standard
Published as ASD-STAN Standard at the date of publication of this document by ASD-STAN, https://www.asd-
stan.org/.
EN 3645-009, Aerospace series — Connectors, electrical, circular, scoop-proof, triple start threaded
coupling, operating temperature 175 °C or 200 °C continuous — Part 009: Receptacle, round flange, jam nut
mounting — Product standard
EN 3645-010, Aerospace series — Connectors, electrical, circular, scoop-proof, triple start threaded
coupling, operating temperature 175 °C or 200 °C continuous — Part 010: Receptacle, hermetic, round
flange, jam nut mounting — Product standard
EN 3645-011, Aerospace series — Connectors, electrical, circular, scoop-proof, triple start threaded
coupling, operating temperature 175 °C or 200 °C continuous — Part 011: Lanyard release plug with
grounding fingers — Type 1 — Product standard
EN 3645-012, Aerospace series — Connectors, electrical, circular, scoop-proof, triple start threaded
coupling, operating temperature 175 °C or 200 °C continuous — Part 012: Lanyard release plug with
grounding fingers — Type 2 — Product standard
EN 3645-013, Aerospace series — Connectors, electrical, circular, scoop-proof, triple start threaded
coupling, operating temperature 175 °C or 200 °C continuous — Part 013: Dummy receptacle — Product
standard
EN 4529-002, Aerospace series — Elements of electrical and optical connection — Sealing plugs —
Part 002: Index of product standards
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 3645-001 apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at https://www.electropedia.org/
4 Description and codification of class
According to Table 1.
Table 1
Model Description
Receptacles and plugs, cadmium-plated aluminium alloy, olive drab — 500 h
W salt spray — Plug with grounding spring — Crimp, removable contacts —
Maximum operating temperature 175 °C continuous
Receptacles and plugs, cadmium-plated composite, olive drab — 2 000 h salt
J spray — Plug with grounding spring — Crimp, removable contacts —
1 500 matings — Maximum operating temperature 175 °C continuous
Connector
Receptacles and plugs, zinc-nickel plated composite, non reflective dark —
with Zero hexavalent chromium compounds (see Table 2 list) added by any
actor of the Supply Chain or used in the manufacturing process. — The
V coating shall consist of a zinc nickel alloy that has a minimum of 120 g/kg and
maximum 200 g/kg of nickel, the balance being zinc — 2 000 h salt spray —
Plug with grounding spring — Crimp, removable contacts —
1 500 matings — Maximum operating temperature 175 °C continuous
Model Description
Receptacles and plugs, zinc-nickel plated aluminium alloy, non-reflective
dark — with zero hexavalent chromium compounds (see Table 2 list) added
by any actor of the supply chain or used in the manufacturing process —
Z The coating shall consist of a zinc nickel alloy that has a minimum of 120 g/kg
and maximum 200 g/kg of nickel, the balance being zinc — 500 h salt
spray — Plug with grounding spring — Crimp, removable contacts —
Maximum operating temperature 175 °C continuous
Receptacles and plugs, passivated stainless steel — 500 h salt spray — Plug
K with grounding spring — Fire-resistant — Crimp, removable contacts —
Maximum operating temperature 200 °C continuous
Receptacles and plugs, nickel-plated aluminium alloy — 48 h salt spray —
Connector
F Plug with grounding spring — Crimp, removable contacts — Maximum
operating temperature 200 °C continuous
Receptacles and plugs, nickel-plated composite — 2 000 h salt spray — Plug
M with grounding spring — Crimp, removable contacts — 1 500 matings —
Maximum operating temperature 200 °C continuous
Hermetic receptacle, passivated stainless steel — Solder contacts —
Y
Maximum operating temperature 200 °C continuous
Receptacles and plugs, nickel fluorocarbon polymer plated aluminium alloy,
T non-reflective — 500 h salt spray — Plug with grounding spring — Crimp,
removable contacts — Maximum operating temperature 175 °C continuous
Protective cover for plug in passivated corrosion resisting steel — Maximum
K
operating temperature 200 °C continuous
Protective cover for receptacle or plug in nickel-plated aluminium alloy —
F
Maximum operating temperature 200 °C continuous
Protective cover for receptacle or plug, zinc-nickel plated aluminium alloy,
non-reflective dark — with zero hexavalent chromium compounds
(see Table 2 list) added by any actor of the supply chain or used in the
Protective Z
manufacturing process — The coating shall consist of a zinc nickel alloy that
cover
has a minimum of 120 g/kg and maximum 200 g/kg of nickel, the balance
being zinc — Maximum operating temperature 175 °C continuous
Protective cover for receptacle or plug in olive-green cadmium-plated
W
aluminium alloy — Maximum operating temperature 175 °C continuous
Protective cover for receptacle or plug in nickel fluorocarbon polymer plated
T aluminium alloy, non-reflective — Maximum operating temperature 175 °C
continuous
Dummy receptacle in passivated stainless steel — Maximum operating
K
temperature 200 °C continuous
Dummy
receptacle
Dummy receptacle in nickel-plated aluminium alloy — Maximum operating
F
temperature 200 °C continuous
Model Description
Dummy receptacle, zinc-nickel plated aluminium alloy, non-reflective dark —
with zero hexavalent chromium compounds (see Table 2 list) added by any
actor of the supply chain or used in the manufacturing process — The coating
Z
shall consist of a zinc nickel alloy that has a minimum of 120 g/kg and
maximum 200 g/kg of nickel, the balance being zinc — Maximum operating
Dummy
temperature 175 °C continuous
receptacle
Dummy receptacle in olive-green cadmium-plated aluminium alloy —
W
Maximum operating temperature 175 °C continuous
Dummy receptacle in nickel fluorocarbon polymer plated aluminium alloy,
T
non-reflective — Maximum operating temperature 175 °C continuous

Table 2 — Hexavalent chromium compound list
Substance name CAS number
Acids generated from chromium
trioxide and their oligomers. Names
7738–95–5
of the acids and their oligomers:
chromic acid, dichromic acid,
13530–68–2
oligomers of chromic acid and
dichromic acid.
Chromium trioxide 1333–82–0
Potassium dichromate 7778–50–9
Sodium chromate 7775–11–3
7789–12–0
Sodium dichromate
10588–01–9
Dichromium tris(chromate) 24613–89–6
Pentazinc chromate octahydroxide 49663–84–5
Potassium
11103–86–9
hydroxyoctaoxodizincatedichromate
Strontium chromate 7789–06–2
5 Operating conditions
5.1 Combinations of plugs and receptacles
Table 3 shows the combinations marked by X which achieve the characteristics specified for each model.
For other combinations, the characteristics of the pair of connectors are those of the component with the
lowest performance.
Other combinations may be used subject to the approval of the design authority.
Table 3
Plug model
Receptacle model
W F J V M K Z T
W X — X X — — X —
F — X — — X — — —
J X — X X — — X —
V X — X X — — X —
M — X — — X — — —
Y — — — — X X — —
K — — — — — X — —
Z X — X X — — X —
T — — — — — — — X
5.2 Combinations of protective covers and connectors
According to Table 4.
Table 4
Flight cap for Dummy receptacle
Receptacle model Plug model
receptacle Flight cap for plug
J/V J/V
W W W W
Z Z
M M
F F
F F
Y K
K K
K
Z Z
Z Z
W/J/V W/J/V
T T T T
5.3 Permissible cables
The sealing performance of these connectors is achieved with the cables of dimensions given in Table 5,
using the accessories and wiring tools specified.
Table 5
Dimensions in millimetres
Contact size Outer diameters of cables
min. max.
22 0,75 1,37
20 1,01 2,11
16 1,65 2,77
12 2,47 3,61
10 3,42 5,21
...