kSIST FprEN 2942:2026

• Abstract:

  This document specifies the characteristics of inserts self-locking, helical coil tanged insertion drive, MJ screw threads in NI-PH2801, silver plated, for aerospace applications.; Maximum test temperature: 550 °C.

• Status: Not Published
• Public Enquiry End Date: 17-May-2022
• ICS: 49.030.20 - Bolts, screws, studs
• Technical Committee: I13 - Imaginarni 13
• Current Stage: 5020 - Formal vote (FV) (Adopted Project)
• Start Date: 09-Jul-2026
• Due Date: 27-Aug-2026
• Ref Project: 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

• Revised: SIST EN 2942:2001 - Aerospace series - Inserts, screw thread, helical coil, self-locking, in heat resisting nickel base alloy NI-PH2801 (Inconel X750), silver plated
• Effective Date: 18-Jan-2023

Overview

kSIST FprEN 2942:2026 is a European draft standard prepared by SIST, focusing on aerospace fastener components. It specifies the characteristics of self-locking, helical coil inserts with MJ screw threads, featuring a tanged insertion drive. These inserts are manufactured from a heat-resisting nickel base alloy, NI-PH2801 (commonly known as Inconel X750), and are finished with a silver plating. Designed for use in aerospace applications, these inserts can withstand maximum test temperatures up to 550 °C, making them highly suitable for demanding environments where reliability, thermal resistance, and secure fastening are critical.

Key Topics

• Aerospace fastener inserts: Helical coil, self-locking tanged style with MJ screw threads, compliant with international aerospace practices.
• Material specification: Made from NI-PH2801 (Inconel X750), a nickel-chromium-based superalloy offering excellent heat resistance and mechanical durability.
• Silver plating: Surface treated per EN 2786, providing enhanced corrosion resistance and improved conductivity, with thickness ranging from 2 μm to 5 μm.
• Thread standards: Uses MJ thread form per ISO 5855-2 for compatibility with aerospace bolts and screws.
• High-temperature performance: Certified for usage at temperatures up to 550 °C, ensuring insert reliability in engine components and high-heat airframe zones.
• Design and marking: Conformance to EN 2424 for product marking; configuration, tolerances, and dimensional requirements specified for consistent integration.
• Quality and qualification: Requires manufacturers to operate an approved aerospace quality management system (e.g., EN 9100) and to use recognized qualification procedures, ensuring component traceability and performance.

Applications

The kSIST FprEN 2942:2026 standard supports applications where secure, high-performance threaded fastener retention is essential under harsh aerospace conditions, including:

• Aircraft engines: Used in components exposed to extreme temperatures and stress, such as turbine cases, compressors, and mounts.
• Airframe structures: Suitable for locations requiring reliable thread repair or reinforcement, especially where vibration and temperature fluctuations are significant.
• Maintenance and retrofitting: Provides standardization for replacement inserts in existing assemblies, supporting efficient repair and upgrade cycles across aircraft fleets.
• Spacecraft and defense platforms: Applicable to high-stress, high-temperature threaded connections in launch vehicles, satellites, and defense aircraft.

By specifying high-strength, self-locking inserts with excellent resistance to heat and corrosion, this standard ensures safety, performance, and reliability of threaded joints in aerospace assemblies.

Related Standards

• EN 3018: Material specification for NI-PH2801 wire, the basis for the manufacturing of thread inserts.
• EN 2786: Procedures for electrolytic silver plating of aerospace fasteners.
• ISO 5855-2: Limit dimensions for MJ threads used in aerospace bolts and nuts.
• EN 2424: Methods for marking aerospace products, ensuring traceability and compliance.
• EN 2943: Technical specifications for helical coil threaded inserts with MJ and M threads.
• EN 3044: Design standard for installation holes for helical coil inserts.
• EN 2945: Assembly procedures for installing self-locking helical coil inserts.
• EN 9100: Quality management systems requirements for aviation, space, and defense organizations.
• EN 9133: Qualification procedure guidelines for aerospace standard products.

By adhering to these related aerospace standards, kSIST FprEN 2942:2026 facilitates cross-industry compatibility, consistent quality, and streamlined engineering practices throughout the aerospace sector.

SLOVENSKI STANDARD
oSIST prEN 2942:2022
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
oSIST prEN 2942:2022 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST prEN 2942:2022
oSIST prEN 2942:2022
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.

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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.

oSIST prEN 2942:2022
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

oSIST prEN 2942:2022
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
...