EN 4622:2010

Aerospace series - Inserts, MJ threads, self-locking, with self-broaching keys, in heat resisting steel FE-PA2601 (A286), MoS2 coated

This standard specifies the characteristics of self-locking, MJ thread inserts, self-broaching keys, in FE PA2601, MoS2 coated, for aerospace applications.
Classification: 1 100 MPa / 315 °C

Luft- und Raumfahrt - Gewindeeinsätze, MJ-Gewinden, selbstsichernd, mit selbsträumenden Stiften, aus hochwarmfestem Stahl FE-PA2601 (A286), MoS2 beschichtet

Diese Norm legt die Eigenschaften von selbstsichernden Gewindeeinsätzen aus FE-PA2601,
MoS2-beschichtet, MJ-Gewinde und mit selbsträumenden Stiften für Anwendungen in der Luft- und Raumfahrt
fest.
Klasse: 1 100 MPa1)/315 °C2).

Série aérospatiale - Douilles filetées, à filetage MJ, à freinage interne, à clavettes auto-brochantes, en acier résistant à chaud FE-PA2601 (A286), revêtues MoS2

Aeronavtika - Vložki, navoj MJ, samozapiralni, s samozagozdnim ključem, 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: 1100 MPa/315 °C.

General Information

• Status: Published
• Publication Date: 20-Apr-2010
• Withdrawal Date: 30-Oct-2010
• ICS: 49.030.10 - Screw threads
• ICS: 49.030.30 - Nuts
• Technical Committee: ASD-STAN - Aerospace
• Drafting Committee: ASD-STAN/D 3 - Mechanical
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 21-Apr-2010
• Completion Date: 21-Apr-2010
• Ref Project: SIST EN 4622:2010 - Aerospace series - Inserts, MJ threads, self-locking, with self-broaching keys, in heat resisting steel FE-PA2601 (A286), MoS2 coated

Overview

EN 4622:2010 is a European standard established by CEN that specifies the characteristics of aerospace-grade self-locking MJ thread inserts featuring self-broaching keys. These inserts are manufactured from heat-resisting steel FE-PA2601 (equivalent to A286), coated with molybdenum disulphide (MoS2) to enhance performance under high-temperature conditions. This aerospace series standard targets the durability and reliability requirements essential in demanding aerospace applications, where thread integrity and thermal resistance are critical.

This standard applies to inserts classified for a minimum tensile stress of 1,100 MPa and operational temperatures up to 315 °C. EN 4622:2010 ensures that the insert design meets stringent dimensional tolerances, material properties, and coating specifications, positioning it as a critical reference for aerospace engineers, manufacturers, and quality assurance professionals.

Key Topics

• Self-locking MJ Thread Inserts: The standard defines inserts with self-locking MJ threads that feature self-broaching keys. This design provides secure fastening without the risk of loosening under vibration or thermal cycling.

• Material Specifications:

  • Inserts are made from FE-PA2601 (A286) heat-resisting steel, treated to achieve hardness between 370 HV and 435 HV.
  • Keys are composed of stainless steel or nickel alloy, hardened to above 600 HV for superior wear resistance.

• Surface Treatment:

  • MoS2 (molybdenum disulphide) coating is applied according to EN 2491 procedures, providing dry lubrication that supports thermal resistance and reduces friction.

• Dimensional Standards:

  • Detailed dimensions, tolerances, and mass specifications are provided for normal size inserts and repair sizes (first and second oversize).
  • Compliance with ISO 5855-1 and ISO 5855-2 ensures compatibility with aerospace MJ thread design principles.

• Installation and Identification:

  • Installation and removal procedures correlate with EN 4619.
  • Marking and identification comply with EN 2424 and TR 3198 for traceability and quality assurance.

Applications

EN 4622:2010 inserts are designed specifically for aerospace fasteners requiring high strength and thermal endurance. Typical applications include:

• Aerospace Structural Assemblies: Secure joining points where vibration and high temperature conditions are prevalent, such as engine components and airframe structures.

• Repair and Maintenance: The standard defines repair size inserts catering to restoration in worn or damaged threaded holes, facilitating cost-effective maintenance without compromising safety.

• High-Temperature Environments: The heat-resistant properties of FE-PA2601 steel combined with MoS2 lubrication ensure performance reliability in components exposed to temperatures up to 315 °C, such as in jet engines or exhaust systems.

• Self-Locking Fasteners: Critical assemblies where loosening prevention is vital under dynamic loads and thermal cycling stresses.

Related Standards

To fully leverage EN 4622:2010 in aerospace design and manufacturing, professionals should be aware of complementary standards:

• EN 4619: Installation and removal procedures for self-locking MJ thread inserts with self-broaching keys.
• EN 4620: Design principles for inserts with MJ threads and self-broaching keys.
• EN 4621: Technical specifications that detail testing and quality parameters for these inserts.
• EN 2491: Defines coating methods for molybdenum disulphide dry lubricants.
• ISO 5855 Part 1 & 2: General requirements and limit dimensions for aerospace MJ threaded bolts and nuts.
• EN 2399 & EN 3639: Standards covering the heat-resisting steel FE-PA2601 used for these inserts and keys.

Practical Value

Adopting EN 4622:2010 ensures engineers and manufacturers in the aerospace sector can source or produce thread inserts that meet internationally harmonized quality benchmarks. This enhances component reliability, simplifies the certification process, and supports maintenance protocols through clearly defined repair options. The standard’s focus on self-locking features and high-temperature tolerance addresses critical operational challenges, helping aerospace systems maintain structural integrity in extreme conditions. Additionally, strict dimensional and material criteria support interchangeability and long-term durability, key factors in aerospace production and after-market servicing.

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Keywords: EN 4622:2010, aerospace inserts, self-locking MJ threads, self-broaching keys, FE-PA2601, A286 steel, MoS2 coating, aerospace fasteners, aerospace thread inserts, high-temperature inserts, thread repair inserts, aerospace standards, CEN aerospace standard, aerospace component durability.

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Luft- und Raumfahrt - Gewindeeinsätze, MJ-Gewinden, selbstsichernd, mit selbsträumenden Stiften, aus hochwarmfestem Stahl FE-PA2601 (A286), MoS2 beschichtetSérie aérospatiale - Douilles filetées, à filetage MJ, à freinage interne, à clavettes auto-brochantes, en acier résistant à chaud FEPA2601 (A286), revêtues MoS2Aerospace series - Inserts, MJ threads, self-locking, with self-broaching keys, in heat resisting steel FE-PA2601 (A286), MoS2 coated49.030.10NavojiScrew threadsICS:Ta slovenski standard je istoveten z:EN 4622:2010SIST EN 4622:2010en01-julij-2010SIST EN 4622:2010SLOVENSKI
STANDARD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 4622
April 2010 ICS 49.030.30 English Version
Aerospace series - Inserts, MJ threads, self-locking, with self-broaching keys, in heat resisting steel FE-PA2601 (A286), MoS2coated
Série aérospatiale - Douilles filetées, à filetage MJ, à freinage interne, à clavettes auto-brochantes, en acier résistant à chaud FE-PA2601 (A286), revêtues MoS2
Luft- und Raumfahrt - Gewindeeinsätze, MJ-Gewinden, selbstsichernd, mit selbsträumenden Stiften, aus hochwarmfestem Stahl FE-PA2601 (A286), MoS2 beschichtet This European Standard was approved by CEN on 16 January 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:
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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 4622:2010: ESIST EN 4622:2010
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