FprEN 2942

Aerospace series - Insert, MJ screw thread, helical coil, self-locking tanged insertion drive, in heat resisting nickel base alloy NI-PH2801 (Inconel X750), silver plated

This document specifies the characteristics of self-locking inserts, helical coil tanged insertion drives, MJ screw threads in NI-PH2801 and silver plated inserts for aerospace applications.
The maximum test temperature is 550 °C.

Luft- und Raumfahrt - Draht-Gewindeeinsätze, selbstsichernd, aus hochwarmfester Nickelbasislegierung NI-PH2801 (Inconel X750 - EN 3018), versilbert

Série aérospatiale - Filets rapportés, filetages MJ, à freinage interne, entraînement d'insertion à tenon, en alliage résistant à chaud base nickel NI-PH2801 (Inconel X750), argentés

Le présent document spécifie les caractéristiques des filets rapportés, à freinage interne, à enroulement hélicoïdal, avec entraînement d'insertion à tenon et filetages MJ en NI PH2801, argentés, pour les applications aérospatiales.
Température maximale d'essai : 550 °C.

Aeronavtika - Vložek s spiralnim navojem MJ, samozapiralni, za ročno vstavljanje, iz toplotno odporne zlitine na nikljevi osnovi NI-PH2801 (Inconel X750), posrebreni

General Information

• Status: Not Published
• Publication Date: 29-Nov-2026
• ICS: 49.030.30 - Nuts
• Technical Committee: ASD-STAN - Aerospace
• Drafting Committee: ASD-STAN/D 3/S 2 - Fasteners
• Current Stage: 4599 - Dispatch of FV draft to CMC - Finalization for Vote
• Start Date: 29-Apr-2026
• Completion Date: 29-Apr-2026
• Ref Project: oSIST prEN 2942:2022 - Aerospace series - Insert, MJ screw thread, helical coil, self-locking tanged insertion drive, in heat resisting nickel base alloy NI-PH2801 (Inconel X750), silver plated

Relations

• Revises: EN 2942:1998 - Aerospace series - Inserts, screw thread, helical coil, self-locking, in heat resisting nickel base alloy NI-PH2801 (Inconel X750), silver plated
• Effective Date: 19-Jan-2023

Overview

FprEN 2942 is a CEN draft European Standard developed by the Aerospace and Defence Industries Association of Europe (ASD-STAN). It specifies the characteristics of self-locking helical coil inserts with tanged insertion drive, using MJ screw threads made of a high-performance nickel base alloy, NI-PH2801 (Inconel X750), and finished with a silver plating. This standard is especially relevant for aerospace applications where materials are required to withstand high temperatures, with a maximum test temperature of 550 °C.

With its rigorous requirements and focus on temperature-resistant materials, FprEN 2942 ensures reliability and safety for threaded fastener assemblies in the demanding aerospace industry.

Key Topics

• Product Definition: Describes self-locking helical coil inserts equipped with a tanged insertion drive, MJ screw threads, and silver plated surfaces.
• Material Specification: Inserts must be manufactured from NI-PH2801 (Inconel X750) per EN 3018, a nickel base alloy known for heat resistance and excellent mechanical properties.
• Surface Treatment: Specifies silver plating thickness from 2 μm to 5 μm in line with EN 2786, ensuring corrosion resistance and electrical conductivity.
• Thread Form: Uses MJ thread profiles, widely recognized in aerospace for their fatigue resistance and strength.
• Dimensional Requirements: Dimensions, tolerances, and mass are specified to ensure interchangeability and uniform performance across aerospace industries.
• Quality Management: Requires manufacturing under an approved quality management system, such as EN 9100 or recognized equivalents, with procedures for product qualification.
• Marking and Identification: Marking must adhere to EN 2424, ensuring full traceability of each insert.

Applications

FprEN 2942 self-locking inserts deliver critical functionality in aerospace assemblies that operate under severe environmental and mechanical stresses. Key application areas include:

• Aircraft Structural Assemblies: Used in fastening elements where vibration resistance, mechanical stability, and temperature resistance are vital.
• Engine and Hot Section Components: Suitable for regions subject to extreme temperatures, thanks to the heat resisting properties of Inconel X750 and the reliable locking feature.
• Maintenance and Repair Operations (MRO): Facilitates secure thread repairs and replacements in aerospace equipment, restoring strength to damaged tapped holes.
• Avionics Enclosures: Offers dependable electrical and corrosion protection due to the silver plated finish, suitable for both mechanical and electronic assembly points.
• Other High-Performance Industries: While designed for aerospace, these inserts also serve in demanding automotive, energy, and defense applications with similar high-temperature and vibration requirements.

Related Standards

• EN 3018: Specifies the material requirements for the nickel base alloy NI-PH2801 (Inconel X750) used in these inserts.
• EN 2786: Details specifications for electrolytic silver plating of aerospace fasteners.
• EN 2943: Provides the technical specification for helical coil inserts with MJ and M screw threads.
• EN 3044: Outlines installation hole requirements for self-locking helical coil inserts.
• EN 2424: Defines marking methods for aerospace products, ensuring traceability.
• ISO 5855-2: Specifies the limit dimensions for MJ threads, commonly used in aerospace bolts and nuts.
• EN 9100: Covers quality management system requirements for aviation, space, and defense organizations.
• EN 9133: Describes the qualification procedure for aerospace standard products.
• EN 2945: Offers guidance on assembly procedures for screw thread helical coil inserts.

Conclusion

Adhering to FprEN 2942 guarantees that self-locking helical coil inserts meet stringent aerospace industry standards for strength, reliability, and durability. This standard ensures parts perform optimally in extreme conditions, maintains high safety levels, and provides compatibility with existing aerospace hardware and systems-all key factors in the successful design and maintenance of modern aircraft and related aerospace equipment.

Standards Content (Sample)

SLOVENSKI STANDARD
01-april-2022
Aeronavtika - Vložek s spiralnim navojem MJ, samozapiralni, za ročno vstavljanje,
iz toplotno odporne zlitine na nikljevi osnovi NI-PH2801 (Inconel X750), posrebreni
Aerospace series - Insert, MJ screw thread, helical coil, self-locking tanged insertion
drive, in heat resisting nickel base alloy NI-PH2801 (Inconel X750), silver plated
Luft- und Raumfahrt - Draht-Gewindeeinsätze, selbstsichernd, aus hochwarmfester
Nickelbasislegierung NI-PH2801 (Inconel X750 - EN 3018), versilbert
Série aérospatiale - Filet rapportés, à freinage interne, en alliage résistant à chaud à
base de nickel NI-PH2801 (Inconel X750), argentés
Ta slovenski standard je istoveten z: prEN 2942:2022
ICS:
49.030.20 Sorniki, vijaki, stebelni vijaki Bolts, screws, studs
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
prEN 2942
NORME EUROPÉENNE
EUROPÄISCHE NORM
February 2022
ICS Will supersede EN 2942:1998
English Version
Aerospace series - Insert, MJ screw thread, helical coil, self-
locking tanged insertion drive, in heat resisting nickel base
alloy NI-PH2801 (Inconel X750), silver plated
Série aérospatiale - Filet rapportés, à freinage interne, Luft- und Raumfahrt - Draht-Gewindeeinsätze,
en alliage résistant à chaud à base de nickel NI-PH2801 selbstsichernd, aus hochwarmfester
(Inconel X750), argentés Nickelbasislegierung NI-PH2801 (Inconel X750 - EN
3018), versilbert
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee ASD-
STAN.
If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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, Turkey and
United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 2942:2022:2022 E
worldwide for CEN national Members.

prEN 2942:2022 (E)
Contents Page
European Foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Required characteristics . 5
4.1 Configuration — Dimensions — Tolerances — Masses . 5
4.2 Material . 8
4.3 Surface treatment . 8
5 Designation . 8
6 Marking . 8
7 Technical specification . 8
8 Quality management systems . 8
Bibliography . 9

prEN 2942:2022 (E)
European Foreword
This document (prEN 2942:2022) has been prepared by the Aerospace and Defence Industries
Association of Europe — Standardization (ASD-STAN).
This document is currently submitted to the CEN Enquiry
...