EN 4673-001:2010

Aerospace series - Inserts, UNJ threads, self-locking, with self-broaching keys - Part 001: Installation and removal procedure

This European Standard specifies the installation and removal procedure (hole profile, tools) of self-locking, self broaching key, UNJ thread inserts defined by EN standards, for aerospace applications.

Luft- und Raumfahrt - Gewindeeinsätze, UNJ-Gewinden, selbstsichernd, mit selbsträumenden Stiften - Teil 001: Ein- und Ausbauverfahren

Diese Norm legt das Ein- und Ausbauverfahren (Lochprofil, Werkzeuge) von selbstsichernden Gewindeeinsätzen
mit UNJ-Gewinden und mit selbsträumenden Stiften nach EN-Normen zur Verwendung in der
Luft-und Raumfahrt fest.

Série aérospatiale - Douilles filetées, à filetage UNJ, à freinage interne, à clavettes auto-brochantes - Partie 001: Procédure d'installation et d'extraction

Aeronavtika - Vložki, navoj UNJ, samozapiralni, s samozagozdnim ključem - 001. del: Postopek namestitve in odstranitve

Ta standard določa postopek namestitve in odstranitve (profili lukenj, orodja) samozapiralnega samozagozdnega ključa in vložkov z navojem MJ, opredeljenih z EN standardi, za uporabo v aeronavtiki.

General Information

• Status: Published
• Publication Date: 17-Aug-2010
• Withdrawal Date: 27-Feb-2011
• 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: 18-Aug-2010
• Completion Date: 18-Aug-2010
• Ref Project: SIST EN 4673-001:2010 - Aerospace series - Inserts, UNJ threads, self-locking, with self-broaching keys - Part 001: Installation and removal procedure

Overview

EN 4673-001:2010 is a European Standard established by CEN that defines the installation and removal procedures for aerospace-grade self-locking UNJ threaded inserts with self-broaching keys. This standard ensures consistent and reliable application of these inserts in aerospace components, critical for maintaining mechanical integrity and safety.

The standard specifies key elements such as hole profiles, tooling, installation techniques (manual and pneumatic), inspection requirements, and repair guidelines. It applies to inserts conforming to related EN design standards and addresses the unique demands of aerospace manufacturing and maintenance.

Key Topics

• Insert Types and Dimensions: Includes normal size, first repair, and second repair size inserts with associated bolt thread diameters and tapped hole dimensions as per ISO 3161.

• Installation Procedures:

  • Hand Installation: Use of specialized tools for screwing and broaching. Lubrication and corrosion prevention practices are emphasized.
  • Air Pressure Installation: Pneumatic installation tools delivering precise torque and broaching action using air pressure guns.

• Inspection and Checks:

  • Verification of insert position and key broaching depth using inspection gauges.
  • Checking for surface defects such as cracks or distortions after installation.
  • Minimum self-locking torque validation using standardized test bolts.

• Removal and Replacement:

  • Drilling and deflecting keys for insert extraction.
  • Use of extraction tools for removing damaged inserts.
  • Repair strategies involving first and second repair size inserts with associated reinstallation protocols.

• Tooling Specifications: Detailed tool dimensions and types for hand and pneumatic installations, with guidance to avoid damage to threads and locking zones.

Applications

EN 4673-001:2010 standard is fundamental for aerospace manufacturing, assembly, and maintenance processes involving threaded inserts. Key application areas include:

• Aircraft Structural Components: Ensuring secure and vibration-resistant fastening in critical assemblies.
• Engine Components: Use in heat-resistant materials requiring durable, self-locking inserts.
• Maintenance and Repair Operations: Standardized procedures for insert removal and replacement maintain component integrity and extend service life.
• Aerospace Fastening Systems: Integration with bolts and tools specifically designed for UNJ threads, promoting consistency in torque and locking features.

This standard supports safety, reliability, and interchangeability within the aerospace supply chain, aligning with stringent industry quality requirements.

Related Standards

For comprehensive compliance and best practices, EN 4673-001:2010 should be used in conjunction with the following related standards:

• EN 4673-002: Design standards for aerospace series inserts with UNJ threads and self-locking keys.
• EN 4673-004, EN 4673-005, EN 4673-006: Material-specific standards covering inserts made from heat-resisting nickel base alloys (Inconel 718, WASPALOY) and heat-resisting steel (A286), including coatings and plating.
• ISO 3161: General requirements and limit dimensions for aerospace UNJ threads, applicable to insert and bolt specifications.

Adhering to these interconnected standards guarantees compatibility and optimizes performance of threaded insert assemblies in demanding aerospace environments.

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Keywords: Aerospace standard, EN 4673-001:2010, UNJ thread inserts, self-locking inserts, self-broaching keys, installation procedure, removal procedure, aerospace fasteners, threaded inserts aerospace, insert inspection, repair fasteners, aerospace maintenance standards.

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Luft- und Raumfahrt - Gewindeeinsätze, UNJ-Gewinden, selbstsichernd, mit selbsträumenden Stiften - Teil 001: Ein- und AusbauverfahrenSérie aérospatiale - Douilles filetées, à filetage UNJ, à freinage interne, à clavettes auto-brochantes - Partie 001 : Procédure d'installation et d'extractionAerospace series - Inserts, UNJ threads, self-locking, with self-broaching keys - Part 001: Installation and removal procedure49.030.30MaticeNutsICS:Ta slovenski standard je istoveten z:EN 4673-001:2010SIST EN 4673-001:2010en01-oktober-2010SIST EN 4673-001:2010SLOVENSKI
STANDARD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 4673-001
August 2010 ICS 49.030.30 English Version
Aerospace series - Inserts, UNJ threads, self-locking, with self-broaching keys - Part 001: Installation and removal procedure
Série aérospatiale - Douilles filetées, à filetage UNJ, à freinage interne, à clavettes auto-brochantes - Partie 001: Procédure d'installation et d'extraction
Luft- und Raumfahrt - Gewindeeinsätze, UNJ-Gewinden, selbstsichernd, mit selbsträumenden Stiften - Teil 001: Ein-und Ausbauverfahren 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 worldwide for CEN national Members. Ref. No. EN 4673-001:2010: ESIST EN 4673-001:2010

EN 4673-004, 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 EN 4673-005, Aerospace series — Inserts, UNJ threads, self-locking, with self-broaching keys — Part 005: In heat resisting nickel base alloy Ni-P101HT (WASPALOY), silver plating
EN 4673-006, Aerospace series — Inserts, UNJ threads, self-locking, with self-broaching keys — Part 006: In heat resisting steel FE-PA2601 (A286), MoS2 coated ISO 3161, Aerospace series — UNJ threads — General requirements and limit dimensions 3 Insert information Tables 1 to 3 provide the cross reference between the insert codification, the related bolt thread and the tapped hole diameter. SIST EN 4673-001:2010

Tapped hole diameter a
Tapped hole reference a
EN 4673-004-3-0 EN 4673-005-3-0 EN 4673-006-3-0 .190 0-32UNJF .312 5-18UNJC-3B EN 4673-002-3-0 EN 4673-004-4-0 EN 4673-005-4-0 EN 4673-006-4-0 .250 0-28UNJF .375 0-16UNJFC-3B EN 4673-002-4-0 EN 4673-004-5-0 EN 4673-005-5-0 EN 4673-006-5-0 .312 5-24UNJF .437 5-16UNJ-3B EN 4673-002-5-0 EN 4673-004-6-0 EN 4673-005-6-0 EN 4673-006-6-0 .375 0-24UNJF .500 0-16UNJ-3B EN 4673-002-6-0 EN 4673-004-7-0 EN 4673-005-7-0 EN 4673-006-7-0 .437 5-20UNJF .562 5-16UNJ-3B EN 4673-002-7-0 EN 4673-004-8-0 EN 4673-005-8-0 EN 4673-006-8-0 .500 0-20UNJF .625 0-16UNJ-3B EN 4673-002-8-0 a According to ISO 3161.
Table 2 — First repair size insert Insert reference Bolt thread diameter a
Tapped hole diameter a
Tapped hole reference a
EN 4673-004-3-1 EN 4673-005-3-1 EN 4673-006-3-1 .190 0-32UNJF .375 0-16UNJC-3B EN 4673-002-3-1 EN 4673-004-4-1 EN 4673-005-4-1 EN 4673-006-4-1 .250 0-28UNJF .437 5-16UNJ-3B EN 4673-002-4-1 EN 4
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