SIST EN 4673-004:2010

Aerospace series - Inserts, UNJ threads, self-locking, with self-broaching keys - Part 004: In heat resisting nickel base alloy NI-P100HT (Inconel 718), silver plating

This European Standard specifies the characteristics of self-locking, inserts for Inch series, self-broaching keys, in NI P100HT, silver plated, for aerospace applications.
Classification: 1 270 MPa  ) / 600 °C  )

Luft- und Raumfahrt - Gewindeeinsätze, UNJ-Gewinden, selbstsichernd, mit selbsträumenden Stiften - Teil 004: Aus Hochwarmfeste Nickellegierung NI-P100HT (Inconel 718), Versilbern

Diese Norm legt die Eigenschaften von selbstsichernden Gewindeeinsätzen für Inch-Reihen aus NI-P100HT,
versilbert und mit selbsträumenden Stiften für Anwendungen in der Luft- und Raumfahrt fest.
Klasse: 1 270 MPa1) / 600 °C2)

Série aérospatiale - Douilles filetées, à filetage UNJ, à freinage interne, à clavettes auto-brochantes - Partie 004 : En alliage résistant à chaud base nickel NI-P100HT (Inconel 718), argentage

Aeronavtika - Vložki, navoj UNJ, samozapiralni, s samozagozdnim ključem - 004. del: Iz toplotnoodporne zlitine na nikljevi osnovi NI-P100HT (Inconel 718), posrebreni

Ta standard opredeljuje značilnosti samozapiralnih vložkov z MJ navojem, s  samozagozdnimi ključi, iz NI-PH2601, posrebrenih, za uporabo v aeronavtiki.
Klasifikacija: 1 270 MPa 1) / 600 °C 2)

General Information

• Status: Published
• Publication Date: 14-Sep-2010
• ICS: 49.030.30 - Nuts
• Technical Committee: I13 - Imaginarni 13
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Sep-2010
• Due Date: 06-Nov-2010
• Completion Date: 15-Sep-2010
• Ref Project: EN 4673-004:2010 - Aerospace series - Inserts, UNJ threads, self-locking, with self-broaching keys - Part 004: In heat resisting nickel base alloy NI-P100HT (Inconel 718), silver plating

Relations

• Refers: SIST EN 4673-003:2010 - Aerospace series - Inserts, UNJ threads, self-locking, with self-broaching keys - Part 003: Technical specification
• Effective Date: 28-Jan-2026
• Refers: SIST EN 4673-001:2010 - Aerospace series - Inserts, UNJ threads, self-locking, with self-broaching keys - Part 001: Installation and removal procedure
• Effective Date: 28-Jan-2026
• Refers: SIST EN 10244-1:2009 - Steel wire and wire products - Non-ferrous metallic coatings on steel wire - Part 1: General principles
• Effective Date: 28-Jan-2026
• Refers: SIST EN 4673-002:2010 - Aerospace series - Inserts, UNJ threads, self-locking, with self-broaching keys - Part 002: Design standard
• Effective Date: 28-Jan-2026
• Refers: SIST EN 2786:2008 - Aerospace series - Electrolytic silver plating of fasteners
• Effective Date: 28-Jan-2026
• Refers: SIST EN 2424:2008 - Aerospace series - Marking of aerospace products
• Effective Date: 28-Jan-2026

Overview

SIST EN 4673-004:2010 is a European standard that defines the characteristics and requirements for self-locking inserts with UNJ threads, equipped with self-broaching keys. These inserts are fabricated from heat-resisting nickel base alloy NI-P100HT (Inconel 718) and feature silver plating for enhanced performance. Tailored specifically for aerospace applications, this standard ensures that Inch series threaded inserts exhibit reliable self-locking functionality and robust performance under demanding temperature and stress conditions. The standard supports aerospace engineering with high-strength fastening solutions suitable for critical environments up to 600°C and tensile strengths up to 1270 MPa.

Key Topics

• Material specification: Inserts are made from NI-P100HT (Inconel 718), a heat-resisting nickel alloy recognized for its mechanical strength and thermal stability.
• Thread type: UNJ threads according to ISO 3161, ensuring compatibility with established aerospace fastener systems.
• Self-locking feature: Internal mechanism and self-broaching keys deliver reliable vibration resistance, maintaining threaded connections under dynamic loads.
• Surface treatment: Silver plating, in line with EN 2786, provides enhanced corrosion resistance and optimized disassembly characteristics.
• Dimensional standards: Sizes, tolerances, and masses are specified for normal and repair-sized inserts, providing standardized installation and interchangeability.
• Marking and identification: Requirements follow EN 2424 and TR 3198 for clear traceability and compliance.

Applications

Self-locking inserts defined by SIST EN 4673-004:2010 are used widely across the aerospace industry for high-performance fastening in metallic structures and engine assemblies. Their key applications include:

• Aircraft structural components: Attaching panels, brackets, and structural reinforcements where strong and secure threads are crucial.
• Aerospace engine assemblies: Providing reliable fastening in high-temperature zones, such as turbine casings and exhaust structures.
• Aerospace repair and maintenance: Available in regular and oversize repair configurations, enabling field repairs and restoration of worn threads in critical assemblies.
• Defense equipment: Suitable for military aircraft, helicopters, and related defense systems requiring robust, vibration-resistant fasteners.
• Space systems: Supported for use in satellite housings and space launch infrastructure, where thermal cycling and mechanical loads demand premium performance.

Related Standards

When applying SIST EN 4673-004:2010, consider these related and referenced standards:

• EN 4673-001: Details installation and removal procedures for inserts.
• EN 4673-002: Specifies the design standard for UNJ thread, self-locking inserts.
• EN 4673-003: Covers the technical specification including testing criteria and performance.
• EN 2424: Establishes marking requirements for aerospace products.
• EN 2786: Details electrolytic silver plating for aerospace fasteners.
• EN 2952: Relates to the heat-resisting nickel alloy material bar standards.
• ISO 3161: Defines general requirements and limits for UNJ threads.
• TR 3198: Governs manufacturers' identification marks for EN aerospace products.

Practical Value

Adhering to SIST EN 4673-004:2010 ensures that aerospace fasteners meet strict international standards for quality, safety, and interchangeability. Utilizing NI-P100HT (Inconel 718) silver-plated self-locking inserts allows manufacturers and maintenance providers to:

• Improve reliability and longevity of threaded joints in extreme operational environments.
• Facilitate efficient maintenance and in-situ repairs using standardized oversize inserts.
• Achieve regulatory compliance and support global supply chains with harmonized specifications.

Through precise specification and reference to supporting standards, this document underpins consistent, high-quality fastening in modern aerospace manufacturing and maintenance processes.

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.SRVUHEUHQLLuft- und Raumfahrt - Gewindeeinsätze, UNJ-Gewinden, selbstsichernd, mit selbsträumenden Stiften - Teil 004: Aus Hochwarmfeste Nickellegierung NI-P100HT (Inconel 718), VersilbernSérie aérospatiale - Douilles filetées, à filetage UNJ, à freinage interne, à clavettes auto-brochantes - Partie 004 : En alliage résistant à chaud base nickel NI-P100HT (Inconel 718), argentageAerospace series - Inserts, UNJ threads, self-locking, with self-broaching keys - Part 004: In heat resisting nickel base alloy NI-P100HT (Inconel 718), silver plating49.030.30MaticeNutsICS:Ta slovenski standard je istoveten z:EN 4673-004:2010SIST EN 4673-004:2010en01-oktober-2010SIST EN 4673-004:2010SLOVENSKI
STANDARD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 4673-004
August 2010 ICS 49.030.30 English Version
Aerospace series - Inserts, UNJ threads, self-locking, with self-broaching keys - Part 004: In heat resisting nickel base alloy NI-P100HT (Inconel 718), silver plating
Série aérospatiale - Douilles filetées, à filetage UNJ, à freinage interne, à clavettes auto-brochantes - Partie 004: En alliage résistant à chaud base nickel NI-P100HT (Inconel 718), argentage
Luft- und Raumfahrt - Gewindeeinsätze, UNJ-Gewinden, selbstsichernd, mit selbsträumenden Stiften -Teil 004: Aus Hochwarmfeste Nickellegierung NI-P100HT (Inconel 718), Versilbern This European Standard was approved by CEN on 12 June 2010.
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 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 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, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
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B-1000 Brussels © 2010 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 4673-004:2010: ESIST EN 4673-004:2010
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