SIST EN 2997-012:2024

Aerospace series - Connectors, electrical, circular, coupled by threaded ring, fire-resistant or non fire-resistant, operating temperatures - 65 °C to 175 °C continuous, 200 °C continuous, 260 °C peak - Part 012: Jam-nut for jam-nut receptacles - Product standard

This document specifies the characteristics of jam-nuts for jam-nut receptacles in the family of circular electrical connectors coupled by threaded ring.
It is applicable to classes specified in Table 3.
For receptacles using these jam-nuts, see EN 2997-004, and EN 2997-006 for class SE only.

Luft- und Raumfahrt - Elektrische Rundsteckverbinder mit Schraubkupplung, feuerbeständig oder nicht feuerbeständig, Betriebstemperaturen -65 °C bis 175 °C konstant, 200 °C konstant, 260 °C Spitze - Teil 012: Sechskantmutter für festen Steckverbinder mit Mutternbefestigung - Produktnorm

Série aérospatiale - Connecteurs électriques circulaires à accouplement par bague filetée, résistant au feu ou non, températures d'utilisation –65 °C à 175 °C continu, 200 °C continu, 260 °C en pointe - Partie 012 : Écrou pour embase à fixation par écrou - Norme de produit

Le présent document spécifie les caractéristiques des écrous pour embases à fixation par écrou de la famille des connecteurs électriques circulaires à accouplement par bague filetée.
Il est applicable aux classes spécifiées dans le Tableau 3.
Pour les embases utilisant ces écrous, voir l’EN 2997-004, et l’EN 2997-006 pour la classe SE uniquement.

Aeronavtika - Konektorji, električni, okrogli, priključeni z navojnim obročkom, odporni ali neodporni proti ognju, s stalno delovno temperaturo med –65 °C in 175 °C, stalno 200 °C, najvišjo 260 °C - 012. del: Šestroba matica za pritrditev z eno luknjo - Standard za proizvod

Ta dokument določa značilnosti šestrobih matic za pritrditev z eno luknjo v družini okroglih električnih konektorjev, priključenih z navojnim obročkom.
Uporablja se za razred iz preglednice 3.
Za pritrditve s temi maticami glej standarda EN 2997-004 in EN 2997-006 (samo za razred SE).

General Information

• Status: Published
• Public Enquiry End Date: 02-May-2023
• Publication Date: 15-Aug-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: 08-Aug-2024
• Due Date: 13-Oct-2024
• Completion Date: 16-Aug-2024
• Ref Project: EN 2997-012:2024 - Aerospace series - Connectors, electrical, circular, coupled by threaded ring, fire-resistant or non-fire-resistant, operating temperatures -65 °C to 175 °C continuous, 200 °C continuous, 260 °C peak - Part 012: Jam-nut for jam-nut receptacles - Product standard

Relations

• Refers: SIST ISO 263:1998 - ISO inch screw threads -- General plan and selection for screws, bolts and nuts -- Diameter range 0.06 to 6 inch
• Effective Date: 09-Feb-2026
• Refers: SIST EN 2997-002:2023 - Aerospace series - Connectors, electrical, circular, coupled by threaded ring, fire-resistant or non fire-resistant, operating temperatures - 65 °C to 175 °C continuous, 200 °C continuous, 260 °C peak - Part 002: Specification of performance and contact arrangements
• Effective Date: 28-Jan-2026
• Refers: SIST EN 2997-001:2017 - Aerospace series - Connectors, electrical, circular, coupled by threaded ring, fire-resistant or non fire-resistant, operating temperatures - 65 °C to 175 °C continuous, 200 °C continuous, 260 °C peak - Part 001: Technical specification
• Effective Date: 28-Jan-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: 28-Jan-2026
• Referred By: SIST EN 3660-004:2019+AC:2019 - Aerospace series - Cable outlet accessories for circular and rectangular electrical and optical connectors - Part 004: Cable outlet, style A, straight, unsealed with clamp strain relief - Product standard
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 3155-081:2015 - Aerospace series - Electrical contacts used in elements of connection - Part 081: Contacts size 22 for EN 2997, electrical, female, type A, crimp, class T - Product standard
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 3155-079:2015 - Aerospace series - Electrical contacts used in elements of connection - Part 079: Contacts size 22 for EN 2997, electrical, female, type A, crimp, class S - Product standard
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 3660-005:2019+AC:2019 - Aerospace series - Cable outlet accessories for circular and rectangular electrical and optical connectors - Part 005: Cable outlet, style A, 90°, unsealed with clamp strain relief - Product standard
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 3660-005:2019 - Aerospace series - Cable outlet accessories for circular and rectangular electrical and optical connectors - Part 005: Cable outlet, style A, 90°, unsealed with clamp strain relief - Product standard
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 3660-065:2010 - Aerospace series - Cable outlet accessories for circular and rectangular electrical and optical connectors - Part 065: Cable outlet, style K, 90°, for heat shrinkable boot, shielded, sealed, self-locking for EN 2997 and EN 4067 - Product standard
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 2997-015:2011 - Aerospace series - Connectors, electrical, circular, coupled by threaded ring, fire-resistant or non fire-resistant, operating temperatures - 65 °C to 175 °C continuous, 200 °C continuous, 260 °C peak - Part 015: Jam-nut mounted receptacle with integrated accessory - Product standard
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 3660-064:2016 - Aerospace series - Cable outlet accessories for circular and rectangular electrical and optical connectors - Part 064: Cable outlet, style K, straight, for heat shrinkable boot, shielded, sealed, self-locking for EN 2997 - Product standard
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 3155-078:2015 - Aerospace series - Electrical contacts used in elements of connection - Part 078: Contacts size 22 for EN 2997, electrical, male, type A, crimp, class S - Product standard
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 3155-081:2019 - Aerospace series - Electrical contacts used in elements of connection - Part 081: Contacts size 22 for EN 2997, electrical, female, type A, crimp, class T - Product standard
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 3155-080:2015 - Aerospace series - Electrical contacts used in elements of connection - Part 080: Contacts size 22 for EN 2997, electrical, male, type A, crimp, class T - Product standard
• Effective Date: 28-Jan-2026

Overview

SIST EN 2997-012:2024 is a European product standard developed by CEN for the aerospace sector. This standard specifies the characteristics and requirements for jam-nuts designed for jam-nut receptacles within the family of circular electrical connectors. These connectors are coupled by a threaded ring and may be fire-resistant or non-fire-resistant, supporting a range of continuous and peak operating temperatures from -65 °C up to 260 °C.

The standard ensures that jam-nuts are compatible with high-reliability circular connectors used in aerospace electric systems, particularly where robust connections and resistance to harsh environments are essential.

Key Topics

• Scope and Applicability: SIST EN 2997-012:2024 applies to jam-nuts for specified classes of electrical circular connectors, referenced in Table 3 of the standard.
• Materials and Finishes:
  • Aluminium alloy jam-nuts with cadmium or nickel plating for resistance to corrosion and varying temperature capabilities.
  • Stainless steel jam-nuts for maximum fire resistance and protection against salt mist.
• Temperature Ratings:
  • Continuous operation from –65 °C to 175 °C, 200 °C, and up to 260 °C peak for select classes.
• Design Features:
  • Defined thread profiles (in accordance with ISO 263).
  • Slot and hole configurations based on connector housing size.
  • Compliance to specified dimensional and mechanical characteristics.
• Compatibility:
  • Intended for use with jam-nut receptacles as detailed in EN 2997-004 and EN 2997-006 (class SE only).
• General Characteristics:
  • Standardized marking, designation, and technical specification references to ensure interchangeability and reliability.

Applications

SIST EN 2997-012:2024 jam-nuts are critical components in aerospace and avionics systems, where electrical connectors must maintain secure contact and withstand extreme operating conditions. Typical applications include:

• Aerospace Wiring Harnesses: Used in aircraft and spacecraft electrical distribution systems to secure receptacle connectors.
• Avionics Systems: Ensuring reliable data and power transmission within cockpit instrumentation and control modules.
• Engine and Power Systems: Withstanding high temperatures and vibration in engine and auxiliary power unit (APU) environments.
• Military and Defense Equipment: Providing robust connections in harsh operational environments.
• Other Transportation Fields: Where similar environmental and operational demands exist, such as in railway or maritime electrical systems.

Related Standards

For a complete and compliant connector assembly, SIST EN 2997-012:2024 refers to several related standards within the EN 2997 series and other international documents:

• EN 2997-001: Technical specification for aerospace circular connectors coupled by threaded ring.
• EN 2997-002: Specification of performance and contact arrangements.
• EN 2997-004: Jam-nut mounted receptacle product standard.
• EN 2997-006: Hermetic jam-nut mounted receptacle product standard (class SE).
• ISO 263: General plan and selection for screw threads for screws, bolts, and nuts.

Practical Value

Implementing SIST EN 2997-012:2024 ensures:

• Interchangeability: Standardization across manufacturers and systems, reducing maintenance complexity.
• Reliability: High-performance connectors, crucial for safety-critical aerospace and defense applications.
• Environmental Resistance: Proven resilience against temperature extremes, corrosion, and mechanical stress.
• Regulatory Compliance: Meets industry requirements for certification and quality assurance.

By adopting this standard, organizations can ensure the reliability and safety of their aerospace electrical connectors, streamline procurement, and reduce life-cycle costs through standardized component selection.

Standards Content (Sample)

SLOVENSKI STANDARD
01-oktober-2024
Aeronavtika - Konektorji, električni, okrogli, priključeni z navojnim obročkom,
odporni ali neodporni proti ognju, s stalno delovno temperaturo med –65 °C in 175
°C, stalno 200 °C, najvišjo 260 °C - 012. del: Šestroba matica za pritrditev z eno
luknjo - Standard za proizvod
Aerospace series - Connectors, electrical, circular, coupled by threaded ring, fire-
resistant or non fire-resistant, operating temperatures - 65 °C to 175 °C continuous, 200
°C continuous, 260 °C peak - Part 012: Jam-nut for jam-nut receptacles - Product
standard
Luft- und Raumfahrt - Elektrische Rundsteckverbinder mit Schraubkupplung,
feuerbeständig oder nicht feuerbeständig, Betriebstemperaturen -65 °C bis 175 °C
konstant, 200 °C konstant, 260 °C Spitze - Teil 012: Sechskantmutter für festen
Steckverbinder mit Mutternbefestigung - Produktnorm
Série aérospatiale - Connecteurs électriques circulaires à accouplement par bague
filetée, résistant au feu ou non, températures d'utilisation –65 °C à 175 °C continu, 200
°C continu, 260 °C en pointe - Partie 012 : Écrou pour embase à fixation par écrou -
Norme de produit
Ta slovenski standard je istoveten z: EN 2997-012:2024
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 2997-012
EUROPEAN STANDARD
NORME EUROPÉENNE
July 2024
EUROPÄISCHE NORM
ICS 49.060 Supersedes EN 2997-012:2009
English Version
Aerospace series - Connectors, electrical, circular, coupled
by threaded ring, fire-resistant or non-fire-resistant,
operating temperatures -65 °C to 175 °C continuous, 200
°C continuous, 260 °C peak - Part 012: Jam-nut for jam-nut
receptacles - Product standard
Série aérospatiale - Connecteurs électriques circulaires Luft- und Raumfahrt - Elektrische Rundsteckverbinder
à accouplement par bague filetée, résistant au feu ou mit Schraubkupplung, feuerbeständig oder nicht
non, températures d'utilisation -65 °C à 175 °C continu, feuerbeständig, Betriebstemperaturen -65 °C bis 175
200 °C continu, 260 °C en pointe - Partie 012 : Écrou °C konstant, 200 °C konstant, 260 °C Spitze - Teil 012:
pour embases à fixation par écrou - Norme de produit Sechskantmutter für feste Steckverbinder mit
Mutternbefestigung - Produktnorm
This European Standard was approved by CEN on 12 May 2024.

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 2997-012:2024 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. 4
4.2 Material, surface treatment . 6
4.3 Main general characteristics . 7
5 Designation . 7
6 Marking . 7
7 Technical specification . 7
Bibliography . 8

European foreword
This document (EN 2997-012:2024) has been prepared by ASD-STAN.
After enquiries and votes carrie
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