General Information

Abstract

This product standard defines a range of grommet nuts, style A, composite, for use under the following conditions:
Associated electrical connector(s)   :   EN 3660-002
Temperature range,   Class P   :   - 55 °C to 200 °C

Status
Published
Publication Date
15-Apr-2008
Withdrawal Date
30-Oct-2008
ICS
49.060 - Aerospace electric equipment and systems
Technical Committee
ASD-STAN - Aerospace
Drafting Committee
ASD-STAN/D 4 - Metallic
Current Stage
9093 - Decision to confirm - Review Enquiry
Start Date
21-Jan-2024
Completion Date
23-Sep-2026
Ref Project
SIST EN 3660-024:2008 - Aerospace series - Cable outlet accessories for circular and rectangular electrical and optical connectors - Part 024: Grommet nut, style A, composite - Product standard

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Overview

EN 3660-024:2008 is a CEN product standard in the ASD-STAN aerospace series that specifies grommet nuts, style A, composite, used as cable outlet accessories for circular and rectangular electrical and optical connectors. The standard covers design, material, designation, marking and test requirements for grommet nuts intended to mate with connectors referenced in EN 3660-002.

Key properties established by the standard include:

  • Material / finish: Class P - composite, natural colour, unplated
  • Temperature range (Class P): -55 °C to 200 °C
  • Shell sizes: defined from size 08 up to 24 (dimensions and mass provided in the standard figure and table)
  • Designation format: example - EN3660-024P08 (grommet nut, style A, composite, variant P, shell size 08)

Key Topics

  • Design & dimensions: Detailed dimensions and mass for each shell size are given in the standard (see figure and table). Thread and knurled options and marking locations are specified.

  • Mechanical parameters: The standard supplies recommended assembly torque limits for installation use and coupling thread strength torques for test purposes. Assembly torque values range from low Nm for smaller shell sizes up to higher Nm for large sizes; coupling-thread test torques are also specified per shell size.

  • Test program: References EN 2591 test methods and EN 3660-001 for technical specification and qualification. Applicable tests include visual inspection, dimensional checks, electrical continuity, surface transfer impedance (noted for 100 MHz to 1 GHz and consideration of higher bands), thermal endurance (Method B - 200 °C for 1 000 h), rapid temperature change, salt mist, sand and dust, low-pressure immersion, fluid and ozone resistance, flammability and fire-resistance, shock, vibration, mechanical endurance, mating/unmating forces and locking wire hole strength.

  • Marking & designation: Marking requirements follow EN 3660-001 with a clear part-numbering scheme for traceability and procurement.

Applications

  • Use as a rear accessory for aerospace electrical and optical connectors where a composite style A grommet nut is required.
  • Suitable for systems requiring a wide operational temperature range (Class P) and compatibility with the EN 3660 series connectors.
  • Applicable in aircraft wiring harnesses, avionics and other aerospace installations requiring standardized cable outlet accessories and documented testability.

Related Standards

  • EN 3660-001 - Technical specification for cable outlet accessories (referenced for terms, definitions and overall technical requirements)
  • EN 3660-002 - Index of product standards (associated connectors)
  • EN 2591 - Aerospace test methods (referenced for specific tests and procedures)

This standard delivers a clear, interoperable product specification for composite grommet nuts (style A) that supports safe, repeatable installation and qualification within aerospace electrical systems.

Relations

Refers
EN 2591-708:2001 - Aerospace series - Elements of electrical and optical connection - Test methods - Part 708: Electrical elements - Measurement of surface transfer impedance of couplers
Effective Date
28-Jan-2026
Refers
EN 2591-407:1999 - Aerospace series - Elements of electrical and optical connection - Test methods - Part 407: Durability of contact retention system and seals
Effective Date
28-Jan-2026
Refers
EN 2591-416:2001 - Aerospace series - Elements of electrical and optical connection - Test methods - Part 416: Contact bending strength
Effective Date
28-Jan-2026
Refers
EN 2591-401:1996 - Aerospace series - Elements of electrical and optical connection - Test methods - Part 401: Acceleration, steady state
Effective Date
28-Jan-2026
Refers
EN 2591-6406:2001 - Aerospace series - Elements of electrical and optical connection - Test methods - Part 6406: Optical elements - Mechanical endurance
Effective Date
28-Jan-2026
Refers
EN 2591-427:2001 - Aerospace series - Elements of electrical and optical connection - Test methods - Part 427: Robustness of protective cover attachment
Effective Date
28-Jan-2026
Refers
EN 2591-6301:2001 - Aerospace series - Elements of electrical and optical connection - Test methods - Part 6301: Optical elements - Endurance at temperature
Effective Date
28-Jan-2026
Refers
EN 2591-502:2001 - Aerospace series - Elements of electrical and optical connection - Test methods - Part 502: Restricted entry
Effective Date
28-Jan-2026
Refers
EN 2591-508:2023 - Aerospace series - Elements of electrical and optical connection - Test methods - Part 508: Measurement of thickness of coating on contacts
Effective Date
28-Jan-2026
Refers
EN 2591-409:1999 - Aerospace series - Elements of electrical and optical connection - Test methods - Part 409: Contact retention in insert
Effective Date
28-Jan-2026
Refers
EN 2591-312:1997 - Aerospace series - Elements of electrical and optical connection - Test methods - Part 312: Air leakage
Effective Date
28-Jan-2026
Refers
EN 3660-001:2019 - Aerospace series - Cable outlet accessories for circular and rectangular electrical and optical connectors - Part 001: Technical specification
Effective Date
28-Jan-2026
Refers
EN 2591-208:1996 - Aerospace series - Elements of electrical and optical connection - Test methods - Part 208: Temperature rise due to rated current
Effective Date
28-Jan-2026
Refers
EN 2591-503:2001 - Aerospace series - Elements of electrical and optical connection - Test methods - Part 503: Contact deformation after crimping
Effective Date
28-Jan-2026
Refers
EN 2591-6318:2001 - Aerospace series - Elements of electrical and optical connection - Test methods - Part 6318: Optical elements - Fire resistance
Effective Date
28-Jan-2026

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Frequently Asked Questions

EN 3660-024:2008 is a standard published by the European Committee for Standardization (CEN). Its full title is "Aerospace series - Cable outlet accessories for circular and rectangular electrical and optical connectors - Part 024: Grommet nut, style A, composite - Product standard". This standard covers: This product standard defines a range of grommet nuts, style A, composite, for use under the following conditions: Associated electrical connector(s) : EN 3660-002 Temperature range, Class P : - 55 °C to 200 °C

This product standard defines a range of grommet nuts, style A, composite, for use under the following conditions: Associated electrical connector(s) : EN 3660-002 Temperature range, Class P : - 55 °C to 200 °C

EN 3660-024:2008 is classified under the following ICS (International Classification for Standards) categories: 49.060 - Aerospace electric equipment and systems. The ICS classification helps identify the subject area and facilitates finding related standards.

EN 3660-024:2008 has the following relationships with other standards: It is inter standard links to EN 2591-708:2001, EN 2591-407:1999, EN 2591-416:2001, EN 2591-401:1996, EN 2591-6406:2001, EN 2591-427:2001, EN 2591-6301:2001, EN 2591-502:2001, EN 2591-508:2023, EN 2591-409:1999, EN 2591-312:1997, EN 3660-001:2019, EN 2591-208:1996, EN 2591-503:2001, EN 2591-6318:2001. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.

EN 3660-024:2008 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.Aerospace series - Cable outlet accessories for circular and rectangular electrical and optical connectors - Part 024: Grommet nut, style A, composite - Product standardYRGSérie aérospatiale - Accessoires arrière pour connecteurs circulaires et rectangulaires électriques et optiques - Partie 024 : Ecrou serre-fils, type A composite - Norme de produitLuft- und Raumfahrt - Endgehäuse für elektrische und optische Rund- und Rechtecksteckverbinder - Teil 024: Mutter, Bauform A, Composite - Produktnorm49.060Aerospace electric equipment and systemsICS:SIST EN 3660-024:2008enTa slovenski standard je istoveten z:EN 3660-024:200801-julij-2008SIST EN 3660-024:2008SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 3660-024April 2008ICS 49.060 English VersionAerospace series - Cable outlet accessories for circular andrectangular electrical and optical connectors - Part 024:Grommet nut, style A, composite - Product standardSérie aérospatiale - Accessoires arrière pour connecteurscirculaires et rectangulaires électriques et optiques - Partie024 : Ecrou serre-fils, type A composite - Norme de produitLuft- und Raumfahrt - Endgehäuse für elektrische undoptische Rund- und Rechtecksteckverbinder - Teil 024:Mutter, Bauform A, Composite - ProduktnormThis European Standard was approved by CEN on 12 January 2008.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN 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 translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2008 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 3660-024:2008: E
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