SIST EN 4673-006:2010

Aerospace series - Inserts, UNJ threads, self-locking, with self-broaching keys - Part 006: In heat resisting steel FE-PA2601 (A286), MoS2 coated

This European Standard specifies the characteristics of self-locking, inserts for Inch series, self-broaching keys, in FE PA2601, MoS2 coated, for aerospace applications.
Classification: 900 MPa  / 315 °C

Luft- und Raumfahrt - Gewindeeinsätze, UNJ-Gewinden, selbstsichernd, mit selbsträumenden Stiften - Teil 006: Mit selbsträumenden Stiften, aus hochwarmfestem Stahl FE-PA2601 (A286), MoS2 beschichtet

Diese Norm legt die Eigenschaften von selbstsichernden Gewindeeinsätzen für Inch-Reihen aus FE-PA2601,
MoS2 beschichtet und mit selbsträumenden Stiften für Anwendungen in der Luft- und Raumfahrt fest.
Klasse: 900 MPa1) / 315 °C2)

Série aérospatiale - Douilles filetées, à filetage UNJ, à freinage interne, à clavettes auto-brochantes - Partie 006 : En acier résistant à chaud FE-PA2601 (A286), revêtues MoS2

Aeronavtika - Vložki, navoj UNJ, samozapiralni, s samozagozdnim ključem - 006. del: Iz toplotnoodpornega jekla FE-PA2601 (A286), mazani z MoS2

Ta standard opredeljuje značilnosti samozapiralnih vložkov z MJ navojem, s  samozagozdnimi ključi, iz FE-PA2601, mazanih z MoS2, za uporabo v aeronavtiki. Klasifikacija: 900 MPa 1)/315°C).

General Information

• Status: Published
• Publication Date: 15-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: 16-Sep-2010
• Ref Project: EN 4673-006:2010 - Aerospace series - Inserts, UNJ threads, self-locking, with self-broaching keys - Part 006: In heat resisting steel FE-PA2601 (A286), MoS2 coated

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 2491:2011 - Aerospace series - Molybdenum disulphide dry lubricants - Coating methods
• Effective Date: 28-Jan-2026
• Refers: SIST EN 2399:2008 - Aerospace series - Heat resisting steel FE-PA2601 (X4NiCrTiMoV26-15) - Rm ≥ 900 MPa - Bars for forged bolts - D ≤ 25 mm
• Effective Date: 28-Jan-2026
• Refers: SIST EN 2424:2008 - Aerospace series - Marking of aerospace products
• Effective Date: 28-Jan-2026

Overview

SIST EN 4673-006:2010 is a European standard developed for the aerospace industry, specifying the characteristics of self-locking inserts with UNJ threads and self-broaching keys. These inserts are crafted from heat-resisting steel FE-PA2601 (A286) and come with a MoS₂ (molybdenum disulphide) coating, offering excellent resistance to high temperatures and strong mechanical properties. With a classification of 900 MPa minimum tensile strength and operational suitability up to 315 °C, this standard addresses demanding aerospace requirements, ensuring reliable performance in critical applications.

Key Topics

• Material and Coating: The inserts are manufactured from FE-PA2601 (A286) heat-resisting steel, treated for high hardness, and coated with MoS₂ for additional lubrication and temperature stability. Keys are made from high-hardness stainless steel or nickel alloy.
• Thread and Design: These are Inch series inserts, featuring UNJ threads for improved fatigue resistance and compatibility with aerospace fasteners.
• Self-Locking and Self-Broaching: The insert design includes an integrated self-locking feature and self-broaching keys, providing secure fixation and simplified installation processes.
• Variants by Repair Size: The standard defines three insert sizes:
  • Normal size
  • First repair size
  • Second repair size
• Tolerances and Dimensions: Detailed requirements on insert configuration, dimensions, and tolerances ensure consistent quality across manufacturing batches.
• Marking and Identification: Inserts are marked according to EN 2424 standards, with manufacturer identification regulated under TR 3198 for traceability.

Applications

The specifications outlined in SIST EN 4673-006:2010 serve a range of practical applications in the aerospace sector, particularly where secure, high-strength thread inserts are required in metallic components. Common uses include:

• Aerostructures: Secure installation of bolts and fasteners in wings, fuselage, and control systems where thermal and mechanical stress is significant.
• Engine Components: Used in parts exposed to elevated temperatures, such as turbine casings or mounting brackets, benefiting from the insert’s enhanced heat resistance and self-locking properties.
• Landing Gear and Undercarriage: Providing durable load-bearing thread repairs or original installations in high-vibration zones.
• Repair and Maintenance: The availability of oversized repair inserts (first and second repair sizes) allow for effective restoration of damaged or stripped bolt holes, extending service life of high-value aerospace components.

Related Standards

For comprehensive application and integration, refer to these associated standards:

• EN 2399: Specifies the properties for heat-resisting steel FE-PA2601 (X4NiCrTiMoV26-15), the base material for inserts.
• EN 2424: Defines the marking of aerospace products, ensuring traceability and identification.
• EN 2491: Details coating methods for molybdenum disulphide, ensuring optimal surface treatment and lubricant performance.
• EN 3639: Covers wire material specifications and properties for heat resistant alloy FE-PA2601.
• EN 4673-001: Provides installation and removal procedures for UNJ thread, self-locking inserts.
• EN 4673-002: The design standard for inserts with self-broaching keys.
• EN 4673-003: Technical specification for the inserts, supplementing this part.
• ISO 3161: Details general requirements and limit dimensions for UNJ threads.
• TR 3198: Identifies manufacturer’s monograms and marks for aerospace products.

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By establishing unified criteria for self-locking, MoS₂-coated inserts in heat-resistant steel, SIST EN 4673-006:2010 plays a crucial role in ensuring safety, reliability, and interchangeability in aerospace engineering and maintenance operations.

Standards Content (Sample)

SLOVENSKI STANDARD
01-november-2010
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GHO,]WRSORWQRRGSRUQHJDMHNOD)(3$$PD]DQL]0R6
Aerospace series - Inserts, UNJ threads, self-locking, with self-broaching keys - Part
006: In heat resisting steel FE-PA2601 (A286), MoS2 coated
Luft- und Raumfahrt - Gewindeeinsätze, UNJ-Gewinden, selbstsichernd, mit
selbsträumenden Stiften - Teil 006: Mit selbsträumenden Stiften, aus hochwarmfestem
Stahl FE-PA2601 (A286), MoS2 beschichtet
Série aérospatiale - Douilles filetées, à filetage UNJ, à freinage interne, à clavettes auto-
brochantes - Partie 006 : En acier résistant à chaud FE-PA2601 (A286), revêtues MoS2
Ta slovenski standard je istoveten z: EN 4673-006:2010
ICS:
49.030.30 Matice Nuts
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 4673-006
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2010
ICS 49.030.30
English Version
Aerospace series - Inserts, UNJ threads, self-locking, with self-
broaching keys - Part 006: In heat resisting steel FE-PA2601
(A286), MoS coated
Série aérospatiale - Douilles filetées, à filetage UNJ, à Luft- und Raumfahrt - Gewindeeinsätze, UNJ-Gewinden,
freinage interne, à clavettes auto-brochantes - Partie 006: selbstsichernd, mit selbsträumenden Stiften - Teil 006: Mit
En acier résistant à chaud FE-PA2601 (A286), revêtues selbsträumenden Stiften, aus hochwarmfestem Stahl FE-
2 2
MoS PA2601 (A286), MoS beschichtet
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.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2010 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 4673-006:2010: E
worldwide for CEN national Members.

Contents Page
Foreword .3
Introduction .4
1 Scope .4
2 Normative references .4
3 Required characteristics .4
3.1 Configuration – Dimensions – Tolerances – Masses .4
3.2 Material .5
3.3 Surface treatment .5
4 Insert definition .5
4.1 Normal size insert .6
4.2 First repair size insert .6
4.3 Second repair size insert .7
4.4 External thread dimension .7
5 Designation .8
6 Marking .8
7 Technical specification .8

Foreword
This document (EN 4673-006:2010) has been prepared by the Aerospace and Defence Industries Association
of Europe - Standardization (ASD-STAN).
After enquiries and votes carried out in accordance with the rules of this Association, this Standard has
received the approval of the National Associations and the Official Services of the member countries of ASD,
prior to its presentation to CEN.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by February 2011, and conflicting national standards shall be withdrawn
at the latest by February 2011.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: 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, Slov
...