SIST EN 4123:2018

Aerospace series - Shank nuts, self-locking, in heat resisting nickel base alloy NI-PH2601 (Inconel 718), silver plated on thread - Classification: 1 550 MPa (at ambient temperature) / 600 °C

This document specifies the characteristics of self-locking shank nuts in NI PH2601, silver plated on thread, for aerospace applications.
Classification: 1 550 MPa / 600 °C.

Luft- und Raumfahrt - Einnietmuttern, selbstsichernd, aus hochwarmfester Nickelbasislegierung NI-PH2601 (Inconel 718), Gewinde versilbert - Klasse: 1 550 MPa (bei Raumtemperatur) / 600 °C

Diese Europäische Norm legt die Eigenschaften von selbstsichernden Einnietmuttern aus NI PH2601, Gewinde versilbert, für Anwendungen in der Luft  und Raumfahrt fest.
Klasse: 1 550 MPa/600 °C

Série aérospatiale - Écrous à sertir, à freinage interne, en alliage résistant à chaud à base de nickel NI-PH2601 (Inconel 718), argentés sur filetage - Classification : 1 550 MPa (à température ambiante ) / 600 °C

Cette présente Norme européenne spécifie les caractéristiques des écrous à sertir, à freinage interne, en NI PH2601, argentés sur filetage, pour applications aérospatiales.
Classification : 1 550 MPa / 600 °C.

Aeronavtika - Zakovičene matice, samovarovalne, iz toplotno odporne zlitine na nikljevi osnovi NI-PH2601 (Inconel 718), posrebreni navoji - Klasifikacija: 1550 MPa (pri temperaturi okolice)/600 °C

Ta dokument določa lastnosti samoblokirnih sidrnih matic s posrebreni navoji iz NI-PH2601 za uporabo v aeronavtiki.
Klasifikacija: 1 550 MPa1/600 °C2.

General Information

• Status: Published
• Publication Date: 05-Jun-2018
• ICS: 49.030.30 - Nuts
• Technical Committee: I13 - Imaginarni 13
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 30-May-2018
• Due Date: 04-Aug-2018
• Completion Date: 06-Jun-2018
• Ref Project: EN 4123:2018 - Aerospace series - Shank nuts, self-locking, in heat resisting nickel base alloy NI-PH2601 (Inconel 718), silver plated on thread - Classification: 1 550 MPa (at ambient temperature) / 600 °C

Relations

• Replaces: SIST EN 4123:2005 - Aerospace series - Shank nuts, self-locking, in heat resisting nickel base alloy NI-PH2601 (Inconel 718), silver plated on thread - Classification: 1 550 MPa (at ambient temperature) / 600 °C
• Effective Date: 23-May-2018
• Revised: SIST EN 4123:2005 - Aerospace series - Shank nuts, self-locking, in heat resisting nickel base alloy NI-PH2601 (Inconel 718), silver plated on thread - Classification: 1 550 MPa (at ambient temperature) / 600 °C
• Effective Date: 30-Nov-2016

Overview

SIST EN 4123:2018 is a European standard published by CEN that specifies the requirements for self-locking shank nuts made from heat resisting nickel base alloy NI-PH2601 (Inconel 718), silver plated on the thread surface. Designed specifically for aerospace applications, this standard defines the characteristics, material, surface treatment, dimensions, and classification of these high-performance fasteners.

The classification highlights that these shank nuts can withstand a tensile stress of 1,550 MPa at ambient temperature and maintain performance at elevated temperatures up to 600 °C. This makes them suitable for critical aerospace components exposed to demanding thermal and mechanical conditions.

Key Topics

• Material Specifications: The nuts are manufactured from NI-PH2601, a nickel base alloy commonly known as Inconel 718, known for its excellent heat resistance and strength after solution treatment and cold working as per EN 2952.

• Self-locking Feature: The nuts incorporate a self-locking mechanism achieved by forming the thread out-of-round within specified tolerances, ensuring secure fastening even under vibrations or thermal fluctuations.

• Surface Treatment: Threads are silver plated in accordance with EN 2786 to enhance corrosion resistance and conductive properties. The plating thickness is at least 5 µm on thread flanks for MJ6 threads, and full coverage without minimum thickness for MJ5.

• Dimensional Accuracy: The standard meticulously defines dimensions, tolerances, masses, and configuration details, applicable after silver plating. These align with aerospace requirements for precision and interchangeability.

• Marking and Designation: Nuts are marked following EN 2424 to ensure traceability and compliance with aerospace identification standards.

• Classification: Designed to withstand a minimum tensile stress of 1,550 MPa at room temperature and feature thermal endurance up to 600 °C, supporting their use in high-stress and high-temperature aerospace environments.

Applications

SIST EN 4123:2018 self-locking shank nuts in Inconel 718 are vital components in aerospace engineering where reliability under extreme conditions is critical. Typical applications include:

• Aircraft structural assemblies requiring secure fastening with high strength and resistance to heat.
• Turbine engine components exposed to elevated temperatures up to 600 °C.
• Spacecraft hardware where materials must maintain mechanical integrity despite thermal cycling and vibration.
• Systems requiring anti-corrosion properties augmented by silver plating on threads.
• Fastening in jet engines and high-performance aerospace machinery demanding long-term durability and mechanical stability.

Using these nuts helps manufacturers meet strict aerospace safety standards, contributes to reducing maintenance needs due to enhanced locking reliability, and supports overall system performance in harsh environments.

Related Standards

• EN 2952: Defines material qualification for heat resisting alloy NI-PH2601, ensuring consistent mechanical and chemical properties crucial for aerospace fasteners.
• EN 2786: Specifies the electrolytic silver plating process for fasteners, critical for corrosion resistance and thread performance.
• EN 4047: Covers technical specifications for self-locking nuts with MJ threads made from the same nickel base alloy, complementing EN 4123.
• EN 2424: Provides guidelines on aerospace product marking to maintain traceability and quality assurance.
• ISO 5855-2: Specifies limit dimensions for MJ threads, ensuring compatibility and interchangeability with bolts and nuts within aerospace assemblies.

Summary

SIST EN 4123:2018 ensures high-performance self-locking shank nuts made of heat resisting Inconel 718 alloy meet stringent aerospace industry demands. By standardizing material, design, surface treatment, and mechanical classification, it provides essential guidance to aerospace manufacturers for producing reliable, heat-resistant fasteners. The inclusion of silver plated threads and compliance with complementary standards further enhance the nuts' durability and functionality in critical aerospace applications.

Keywords: SIST EN 4123:2018, aerospace fasteners, self-locking shank nuts, Inconel 718, nickel base alloy, heat resistant nuts, silver plated threads, aerospace standard, tensile strength 1550 MPa, high temperature fasteners, aerospace nut classification, MJ thread nuts.

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Luft- und Raumfahrt - Einnietmuttern, selbstsichernd, aus hochwarmfester Nickelbasislegierung NI-PH2601 (Inconel 718), Gewinde versilbert - Klasse: 1 550 MPa (bei Raumtemperatur) / 600 °CSérie aérospatiale - Écrous à sertir, à freinage interne, en alliage résistant à chaud à base de nickel NI-PH2601 (Inconel 718), argentés sur filetage - Classification : 1 550 MPa (à température ambiante ) / 600 °CAerospace series - Shank nuts, self-locking, in heat resisting nickel base alloy NI-PH2601 (Inconel 718), silver plated on thread - Classification: 1 550 MPa (at ambient temperature) / 600 °C49.030.30MaticeNutsICS:Ta slovenski standard je istoveten z:EN 4123:2018SIST EN 4123:2018en,fr,de01-julij-2018SIST EN 4123:2018SLOVENSKI
STANDARDSIST EN 4123:20051DGRPHãþD

EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 4123
May
t r s z ICS
v {ä r u rä u r Supersedes EN
v s t uã t r r vEnglish Version
Aerospace series æ Shank nutsá selfælockingá in heat resisting nickel base alloy NIplated on thread æ ClassificaSérie aérospatiale æ Écrous à sertirá à freinage interneá en alliage résistant à chaud à base de nickel NIæPH t x r s
Luftæ und Raumfahrt æ Einnietmutterná selbstsicherndá aus hochwarmfester Nickelbasislegierung NIæPH t x r s This European Standard was approved by CEN on
t t January
t r s zä
egulations which stipulate the conditions for giving this European Standard the status of a national standard without any alterationä Upætoædate lists and bibliographical references concerning such national standards may be obtained on application to the CENæCENELEC Management Centre or to any CEN memberä
translation under the responsibility of a CEN member into its own language and notified to the CENæCENELEC Management Centre has the same status as the official versionsä
CEN members are the national standards bodies of Austriaá Belgiumá Bulgariaá Croatiaá Cyprusá Czech Republicá Denmarká Estoniaá Finlandá Former Yugoslav Republic of Macedoniaá Franceá Germanyá Greeceá Hungaryá Icelandá Irelandá Italyá Latviaá Lithuaniaá Luxembourgá Maltaá Netherlandsá Norwayá Polandá Portugalá Romaniaá Serbiaá Slovakiaá Sloveniaá Spainá Swedená Switzerlandá Turkey and United Kingdomä
EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre:
Rue de la Science 23,
B-1040 Brussels
t r s z CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membersä Refä Noä EN
v s t uã t r s z ESIST EN 4123:2018

Page European foreword . 3 1 Scope . 4 2 Normative references . 4 3 Required characteristics . 4 3.1 Configuration — Dimensions — Tolerances — Masses . 4 3.2 Material . 4 3.3 Surface treatment . 4 4 Designation. 6 5 Marking . 6 6 Technical specification . 6
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