EN 3660-003:2023

Aerospace series - Cable outlet accessories for circular and rectangular electrical and optical connectors - Part 003: Grommet nut, style A - Product standard

This document specifies a range of grommet nuts, style A, for use under the following conditions:
Associated electrical connector(s): EN 3660 002
Temperature range,   Class N:   −65 °C to 200 °C
   Class W:   −65 °C to 175 °C
   Class K:   −65 °C to 260 °C
   Class A:   −65 °C to 200 °C
   Class T:   −65 °C to 175 °C
   Class Z:   −65 °C to 175 °C

Luft- und Raumfahrt - Endgehäuse für elektrische und optische Rund- und Rechtecksteckverbinder - Teil 003: Dichtungsmutter, Bauform A - Produktnorm

Dieses Dokument legt eine Reihe von Dichtungsmuttern, Bauform A, für die Verwendung unter den folgenden Bedingungen fest:
Zugehörige(r) elektrische(r) Steckverbinder: EN 3660 002
Temperaturbereich,   Klasse N:   −65 °C bis 200 °C
   Klasse W:   −65 °C bis 175 °C
   Klasse K:   −65 °C bis 260 °C
   Klasse A:   −65 °C bis 200 °C
   Klasse T:   −65 °C bis 175 °C
   Klasse Z:   −65 °C bis 175 °C

Série aérospatiale - Accessoires arrière pour connecteurs circulaires et rectangulaires électriques et optiques - Partie 003 : Écrou de passe-fil, type A - Norme de produit

Le présent document spécifie une gamme d'écrous de passe-fil, de type A, destinés à être utilisés dans les conditions ci-après :
Connecteur(s) électrique(s) associé(s) : EN 3660-002
Plage de températures,   classe N :   −65 °C à 200 °C
   classe W :   −65 °C à 175 °C
   classe K :   −65 °C à 260 °C
   classe A :   −65 °C à 200 °C
   classe T :   −65 °C à 175 °C
   classe Z :   −65 °C à 175 °C

Aeronavtika - Dodatki za okrogle in pravokotne električne in optične konektorje - 003. del: Tesnilna matica, tip A - Standard za proizvod

Ta dokument določa različne vrste tesnilnih matic, tipa A, za uporabo pod naslednjimi pogoji:
Povezani električni konektorji:   EN 3660-002
Temperaturno območje, razred N:   od –65 °C do 200 °C
razred W:   od –65 °C do 175 °C
razred K:   od –65 °C do 260 °C
razred A:   od –65 °C do 200 °C
razred T:   od –65 °C do 175 °C
razred Z:   od –65 °C do 175 °C

General Information

• Status: Published
• Publication Date: 10-Oct-2023
• Withdrawal Date: 12-Jun-2022
• ICS: 49.060 - Aerospace electric equipment and systems
• Technical Committee: ASD-STAN - Aerospace
• Drafting Committee: ASD-STAN/D 2/S 3 - Elements of Connection (Connectors, Contacts, rear accessories, crimping tools
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 11-Oct-2023
• Completion Date: 11-Oct-2023
• Ref Project: SIST EN 3660-003:2023 - Aerospace series - Cable outlet accessories for circular and rectangular electrical and optical connectors - Part 003: Grommet nut, style A - Product standard

Relations

• Replaces: EN 3660-003:2018 - Aerospace series - Cable outlet accessories for circular and rectangular electrical and optical connectors - Part 003: Grommet nut, style A - Product standard
• Effective Date: 27-Feb-2019

Overview

EN 3660-003:2023 is a European standard published by CEN that defines product specifications for grommet nuts, style A, used as cable outlet accessories for circular and rectangular electrical and optical connectors in aerospace applications. This standard complements the associated connector standard EN 3660-002 and addresses performance requirements across a wide temperature range, ensuring reliability in harsh aerospace environments. It supersedes the previous 2018 edition, refining dimensions, mass, and technical details.

The grommet nuts specified under EN 3660-003:2023 support operational temperature classes from −65 °C up to 260 °C, depending on the class (N, W, K, A, T, Z), making them suitable for extreme aerospace conditions. This standard targets manufacturers, designers, and quality assurance professionals involved in aerospace electrical and optical connector assemblies.

Key Topics

• Product Scope
  Defines dimensions, mass, and interface requirements for style A grommet nuts compatible with EN 3660-002 connectors.

• Temperature Classes

  • Class N, A: −65 °C to 200 °C
  • Class W, T, Z: −65 °C to 175 °C
  • Class K: −65 °C to 260 °C

• Dimensions & Interface

  • Detailed dimensional specifications for various shell sizes (08 to 28) including thread type, external diameters, and tooth count.
  • Interface dimensions ensuring compatibility with associated connectors.

• Material & Finish
  Different materials and protective finishes according to class, including:

  • Aluminium with electroless nickel plating (Class N)
  • Aluminium with olive drab cadmium plating (Class W)
  • Stainless steel passivated (Class K)
  • Aluminium anodized black, nickel PTFE plated or black zinc nickel plated (other classes)

• Assembly & Coupling Torque
  Recommended assembly torque values specified by shell size and class to ensure proper installation and mechanical integrity.

• Testing Requirements
  Rigorous environmental and mechanical tests defined per EN 2591 and EN 3660-001 covering:

  • Thermal endurance
  • Rapid temperature changes
  • Corrosion resistance (salt mist, mold growth)
  • Mechanical shock and vibration
  • Fluid, ozone, and flammability resistance

• Marking & Designation
  Clear guidelines for marking and part numbering to ensure traceability and compliance.

Applications

EN 3660-003:2023 grommet nuts are essential components in aerospace electrical and optical connectors used in:

• Aircraft wiring harnesses
• Aerospace electrical system assemblies
• Harsh environmental conditions subject to temperature extremes and mechanical vibration
• Military and civil aviation applications requiring high-reliability connector accessories
• Optical communication systems within aerospace platforms

These grommet nuts provide reliable cable sealing and retention, preventing ingress of contaminants and maintaining electrical and optical connector performance under challenging operating conditions.

Related Standards

• EN 3660-002: Index of product standards for cable outlet accessories for circular and rectangular connectors - defines associated connector interfaces.
• EN 3660-001: Technical specifications for cable outlet accessories - provides overarching requirements and testing methods.
• EN 2591 (all parts): Aerospace series test methods for electrical and optical connectors - applicable for mechanical and environmental qualification tests.
• ISO and IEC standards for connector terminology and further technical details are also relevant in conjunction with EN 3660-003.

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Keywords: aerospace grommet nut, cable outlet accessory, style A grommet nut, electrical connector accessories, optical connector components, EN 3660-003:2023, aerospace connector standards, cable sealing nuts, temperature class grommet, aerospace connector accessories, CEN aerospace standards.

Standards Content (Sample)

SLOVENSKI STANDARD
01-december-2023
Aeronavtika - Dodatki za okrogle in pravokotne električne in optične konektorje -
003. del: Tesnilna matica, tip A - Standard za proizvod
Aerospace series - Cable outlet accessories for circular and rectangular electrical and
optical connectors - Part 003: Grommet nut, style A - Product standard
Luft- und Raumfahrt - Endgehäuse für elektrische und optische Rund- und
Rechtecksteckverbinder - Teil 003: Dichtungsmutter, Bauform A - Produktnorm
Série aérospatiale - Accessoires arrière pour connecteurs circulaires et rectangulaires
électriques et optiques - Partie 003 : Écrou de passe-fil, type A - Norme de produi
Ta slovenski standard je istoveten z: EN 3660-003:2023
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 3660-003
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2023
EUROPÄISCHE NORM
ICS 49.060 Supersedes EN 3660-003:2018
English Version
Aerospace series - Cable outlet accessories for circular and
rectangular electrical and optical connectors - Part 003:
Grommet nut, style A - Product standard
Série aérospatiale - Accessoires arrière pour Luft- und Raumfahrt - Endgehäuse für elektrische und
connecteurs circulaires et rectangulaires électriques et optische Rund- und Rechtecksteckverbinder - Teil 003:
optiques - Partie 003 : Écrou de passe-fil, type A - Dichtungsmutter, Bauform A - Produktnorm
Norme de produit
This European Standard was approved by CEN on 9 July 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
© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 3660-003:2023 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Characteristics . 4
4.1 Dimensions and mass . 4
4.2 Interface dimensions . 6
4.2.1 Associated connection. 6
4.2.2 Front interface . 6
4.3 Material and finish . 7
4.4 Assembly torque . 8
4.5 Coupling thread strength torque. 8
4.6 Tests . 9
5 Designation . 11
6 Marking . 11
7 Technical specification . 11
Bibliography . 12

European foreword
This document (EN 3660-003:2023) 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 April 2024, and conflicting national standards shall be
withdrawn at the latest by April 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 3660-003:2018.
EN 3660-003:2018:
— Table 1: mass for classes N, A, W, T and Z, shell size 28 updated;
— editorial revision of the document.
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.
1 Scope
This document specifies a range of
...