Aerospace series - Connectors, optical, circular, single and multipin, coupled by triple start threaded ring - Flush contacts - Part 201: Optical contact for EN 4641 singlemode cable -55 °C to 125 °C - Product standard

This standard defines the performance and dimensions of optical PC profiled contact for singlemode 9 micrometres/125 micrometres fibre and (1,8 0,1) mm diameter cable.

Luft- und Raumfahrt - Optische Rundsteckverbinder mit dreigängiger Schraubkupplung - Bündige Kontakte - Teil 201: Optischer Kontakt für EN 4641-Monomodekabel, -55 °C bis 125 °C - Produktnorm

Série aérospatiale - Connecteurs optiques circulaires à accouplement par bague filetée à trois filets - Contacts affleurants - Partie 201: Contact optique pour câble monomode EN 4641 - 55 °C à 125 °C - Norme de produit

La présente norme définit la performance et les dimensions des contacts à profils optiques PC fibre monomode 9 micromètres/125 micromètres et câble de diamètre (1,8  0,1) mm.

Aeronavtika - Konektorji, optični, okrogli, z enim ali več zatiči, priključeni z navojnim obročkom - Izravnani kontakti - 201. del: Optični kontakt za kabel EN 4641 - 55 °C do 125 °C - Standard za proizvod

Ta standard opredeljuje lastnosti in mere optičnih kontaktov s fizičnim stikom za enorodne kable s premerom vlaken 9 mikrometrov/125 mikrometrov in (1,8 1) mm.

General Information

Status
Published
Publication Date
12-Jan-2016
Withdrawal Date
30-Jul-2016
ICS
49.090 - On-board equipment and instruments
Technical Committee
ASD-STAN - Aerospace
Drafting Committee
ASD-STAN/D 2 - Electrical
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Start Date
13-Jan-2016
Completion Date
13-Jan-2016
Ref Project
SIST EN 4531-201:2016 - Aerospace series - Connectors, optical, circular, single and multipin, coupled by triple start threades ring - Flush contacts - Part 201: Optical contact for EN 4641 singlemode cable -55 °C to 125 °C - Product standard

Relations

Refers
EN 2591-217:2002 - Aerospace series - Elements of electrical and optical connection - Test methods - Part 217: Voltage drop under specified current for terminal lugs and in-line splices
Effective Date
28-Jan-2026
Refers
EN 2591-307:2012 - Aerospace series - Elements of electrical and optical connection - Test methods - Part 307: Salt mist
Effective Date
28-Jan-2026
Refers
EN 2591-514:2002 - Aerospace series - Elements of electrical and optical connection - Test methods - Part 514: Solderability of contacts with self-contained solder and flux
Effective Date
28-Jan-2026
Refers
EN 2591-224:2007 - Aerospace series - Elements of electrical and optical connection - Test methods - Part 224: RF leakage
Effective Date
28-Jan-2026
Refers
EN 2591-6321:2002 - Aerospace series - Elements of electrical and optical connection - Test methods - Part 6321: Optical elements - Damp heat, cyclic test
Effective Date
28-Jan-2026
Refers
EN 4641-103:2025 - Aerospace series - Cables, optical 125 μm diameter cladding - Part 103: Semi-loose, ruggedized simplex construction 62,5 µm/125 µm GI fibre nominal 2,74 mm, outside diameter - Product standard
Effective Date
28-Jan-2026
Refers
EN 2591-100:2024 - Aerospace series - Elements of electrical and optical connection - Test methods - Part 100: General
Effective Date
28-Jan-2026
Refers
EN 2591-507:2002 - Aerospace series - Elements of electrical and optical connection - Test methods - Part 507: Plating porosity
Effective Date
28-Jan-2026
Refers
EN 2591-403:2025 - Aerospace series - Elements of electrical and optical connection - Test methods - Part 403: Sinusoidal and random vibration
Effective Date
28-Jan-2026
Refers
EN 2591-225:2007 - Aerospace series - Elements of electrical and optical connection - Test methods - Part 225: RF high potential withstanding voltage
Effective Date
28-Jan-2026
Refers
EN 4641-401:2024 - Aerospace series - Cables, optical 125 μm diameter cladding - Part 401: Tight structure bend insensitive 50 µm/125 µm GI fibre nominal, 1,8 mm outside diameter - Product standard
Effective Date
28-Jan-2026
Refers
EN 2591-402:2012 - Aerospace series - Elements of electrical and optical connection - Test methods - Part 402: Shock
Effective Date
28-Jan-2026
Refers
EN 2591-325:2002 - Aerospace series - Elements of electrical and optical connection - Test methods - Part 325: Ice resistance
Effective Date
28-Jan-2026
Refers
EN 4641-104:2010 - Aerospace series - Cables, optical 125 μm diameter cladding - Part 104: Semi-loose, ruggedized duplex construction 62,5/125 µm GI fibre nominal, 4,95 mm outside diameter - Product standard
Effective Date
28-Jan-2026
Refers
EN 2591-613:2002 - Aerospace series - Elements of electrical and optical connection - Test methods - Part 613: Optical elements - Impact test
Effective Date
28-Jan-2026

Overview - EN 4531-201:2016 (optical contact for EN 4641 singlemode cable)

EN 4531-201:2016 is a CEN product standard in the Aerospace series that specifies the performance, dimensions and testing requirements for a flush optical PC‑profiled contact designed for singlemode 9/125 µm fibre in (1.8 ± 0.1) mm diameter cable. The contact is intended for circular optical connectors coupled by a triple‑start threaded ring and qualified for service between −55 °C and 125 °C. Key physical attributes (ferrule, flange, boot options), material choices and mass limits are defined to ensure interchangeability and reliable optical performance in aerospace applications.

Key topics and technical requirements

  • Optical type and geometry: PC‑profiled contact for singlemode 9/125 µm fibre with a 1.8 ± 0.1 mm cable outer diameter; ferrule material is zirconia (ZrO2).
  • Operating temperature: Rated for −55 °C to 125 °C.
  • Mechanical dimensions & mass: Detailed termini and contact dimensions are provided; maximum contact mass = 1.5 g.
  • Boot and flange options: Long (L) and short (S) boot versions (white/cream); flange materials selectable as composite (C) or metal (M).
  • Optical performance:
    • Initial insertion loss target: ≤ 0.3 dB for 95% of samples at 25 °C (statistical sampling).
    • Maximum insertion loss for all environmental conditions: ≤ 0.7 dB.
    • Return loss: ≥ 45 dB minimum.
  • Durability and environmental tests: Specified tests per EN 2591-100 including:
    • Thermal endurance (1 000 h at 125 °C), rapid temperature change cycles, salt mist, mechanical endurance (500 mating cycles), axial load, impact, cable pull/flex/torque tests, and contact retention checks.
    • Some tests are covered by the companion specification EN 4531‑001 or referenced documents.
  • Tooling & termination: Contact insertion/extraction can be performed by hand from the rear; MIL‑I‑81969/8‑10 tools (size 12) are acceptable. Termination procedures are contained in TR 4646; cleaning guidance references EN 4533‑004.

Practical applications and users

This standard is targeted at organizations involved in aerospace and defense fibre‑optic interconnects, including:

  • Connector and component manufacturers designing aerospace optical connectors.
  • System integrators and avionics designers specifying reliable singlemode optical links.
  • Test laboratories and QA teams performing qualification and acceptance testing to EN 2591 routines.
  • Procurement/specification engineers who require standardized, interchangeable optical contacts for EN 4641 cabling systems.
  • Maintenance and installation personnel following termination and cleaning instructions.

Related standards (useful cross‑references)

  • EN 4531-001 (Technical specification for the connector assembly)
  • EN 4533 (Fibre optic systems handbook)
  • EN 4641 (EN 4641 singlemode cable family)
  • EN 2591 (Aerospace test methods)
  • TR 4646 (Termination procedures)
  • MIL‑I‑81969/8‑10 (tooling guidance)

Keywords: EN 4531-201:2016, optical contact, singlemode 9/125 µm, EN 4641 cable, aerospace connectors, PC profiled contact, −55 °C to 125 °C, insertion loss, return loss.

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Frequently Asked Questions

EN 4531-201:2016 is a standard published by the European Committee for Standardization (CEN). Its full title is "Aerospace series - Connectors, optical, circular, single and multipin, coupled by triple start threaded ring - Flush contacts - Part 201: Optical contact for EN 4641 singlemode cable -55 °C to 125 °C - Product standard". This standard covers: This standard defines the performance and dimensions of optical PC profiled contact for singlemode 9 micrometres/125 micrometres fibre and (1,8 0,1) mm diameter cable.

This standard defines the performance and dimensions of optical PC profiled contact for singlemode 9 micrometres/125 micrometres fibre and (1,8 0,1) mm diameter cable.

EN 4531-201:2016 is classified under the following ICS (International Classification for Standards) categories: 49.090 - On-board equipment and instruments. The ICS classification helps identify the subject area and facilitates finding related standards.

EN 4531-201:2016 has the following relationships with other standards: It is inter standard links to EN 2591-217:2002, EN 2591-307:2012, EN 2591-514:2002, EN 2591-224:2007, EN 2591-6321:2002, EN 4641-103:2025, EN 2591-100:2024, EN 2591-507:2002, EN 2591-403:2025, EN 2591-225:2007, EN 4641-401:2024, EN 2591-402:2012, EN 2591-325:2002, EN 4641-104:2010, EN 2591-613:2002. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.

EN 4531-201:2016 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.

Standards Content (Sample)


2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Luft- und Raumfahrt - Optische Rundsteckverbinder mit dreigängiger Schraubkupplung - Bündige Kontakte
Teil 201: Optischer Kontakt für EN 4641 Monomode-Lichtwellenleiterkabel -55 °C bis 125 °C - ProduktnormSérie aérospatiale - Connecteurs optiques circulaires à accouplement par bague filetée à trois filets - Contacts affleurants - Partie 201: Contact optique pour câble monomode EN 4641 - 55 °C à 125 °C - Norme de produitAerospace series - Connectors, optical, circular, single and multipin, coupled by triple start threades ring - Flush contacts - Part 201: Optical contact for EN 4641 singlemode cable -55 °C to 125 °C - Product standard49.060Aerospace electric equipment and systems31.220.10Plug-and-socket devices. ConnectorsICS:Ta slovenski standard je istoveten z:EN 4531-201:2016SIST EN 4531-201:2016en,fr,de01-marec-2016SIST EN 4531-201:2016SLOVENSKI
STANDARD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 4531-201
January
t r s x ICS
v {ä r { r English Version
Aerospace series æ Connectorsá opticalá circulará single and multipiná coupled by triple start threades ring æ Flush contacts æ Part
t r sã Optical contact for EN
v x v s singlemode cable æ w w
¹C to
s t w
¹C æ Product standard Série aérospatiale æ Connecteurs optiques circulaires à accouplement par bague filetée à trois filets æ Contacts affleurants æ Partie
t r sã Contact optique pour câble monomode EN
v x v s æ
w w
¹C à
s t w
¹C æ Norme de produit
Luftæ und Raumfahrt æ Optische Rundsteckverbinder mit dreigängiger Schraubkupplung æ Bündige Kontakte æ Teil
t r sã Optischer Kontakt für EN
v x v sæMonomodekabelá æ w w
¹C bis
s t w
¹C æ Produktnorm This European Standard was approved by CEN on
z June
t r s wä
egulations which stipulate the conditions for giving this European Standard the status of a national standard without any alterationä Upætoædate lists and bibliographical references concerning such national standards may be obtained on application to the CENæCENELEC Management Centre or to any CEN memberä
translation under the responsibility of a CEN member into its own language and notified to the CENæCENELEC Management Centre has the same status as the official versionsä
CEN members are the national standards bodies of Austriaá Belgiumá Bulgariaá Croatiaá Cyprusá Czech Republicá Denmarká Estoniaá Finlandá Former Yugoslav Republic of Macedoniaá Franceá Germanyá Greeceá Hungaryá Icelandá Irelandá Italyá Latviaá Lithuaniaá Luxembourgá Maltaá Netherlandsá Norwayá Polandá Portugalá Romaniaá Slovakiaá Sloveniaá Spainá Swedená Switzerlandá Turkey and United Kingdomä
EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre:
Avenue Marnix 17,
B-1000 Brussels
t r s x CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membersä Refä Noä EN
v w u sæ t r sã t r s x ESIST EN 4531-201:2016

Page European Foreword . 3 1 Scope . 4 2 Normative references . 4 3 Termini dimensions . 5 4 General dimensions of the optical termini . 6 5 Technical specification . 8 6 Tests according to EN 2591-100 . 8 7 Cleaning instructions . 9 8 Tooling . 9 9 Termination instructions . 10 10 Designation. 10 Bibliography . 11
...

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