EN 4421:2007
(Main)Aerospace series - Studs, in titanium alloy TI-P64001, MoS2 coated, with serrated locking ring in corrosion resisting steel - Strength class: 1 100 MPa (at ambient temperature)
Aerospace series - Studs, in titanium alloy TI-P64001, MoS2 coated, with serrated locking ring in corrosion resisting steel - Strength class: 1 100 MPa (at ambient temperature)
This standard specifies the characteristics of studs in TI P64001, MoS2 coated, with serrated locking ring in corrosion resisting steel for aerospace applications.
Strength class: 1 100 MPa )
Luft- und Raumfahrt - Stiftschrauben, aus Titanlegierung TI-P64001, MoS2 beschichtet, mit Ringsicherung aus korrosionsbeständigem Stahl - Festigkeitsklasse: 1 100 MPa (bei Raumtemperatur)
Diese Norm legt die Merkmale von Stiftschrauben aus TI-P64001, MoS2-beschichtet, mit Ringsiche¬rung aus korrosionsbeständigem Stahl, für Anwendungen in der Luft- und Raumfahrt fest.
Festigkeitsklasse: 1 100 MPa )
Série aérospatiale - Goujons, en alliage de titane TI-P64001, revêtus MoS2, avec bague de verrouillage dentelée, en acier résistant à la corrosion - Classe de résistance: 1 100 MPa (à température ambiante)
Aeronavtika - Stebelni vijaki iz titanove zlitine TI-P64001, namazani z MoS2, z nazobčanim zaklepnim obročem iz korozijsko odpornega jekla - Trdnostni razred: 1100 MPa (pri temperaturi okolice)
General Information
- Status
- Published
- Publication Date
- 19-Jun-2007
- Withdrawal Date
- 30-Dec-2007
- Technical Committee
- ASD-STAN - Aerospace
- Drafting Committee
- ASD-STAN/D 3 - Mechanical
- Current Stage
- 9093 - Decision to confirm - Review Enquiry
- Start Date
- 30-Jun-2017
- Completion Date
- 11-Feb-2026
Relations
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
Overview
EN 4421:2007 is a European standard developed by CEN for aerospace applications. It specifies the characteristics of studs made of titanium alloy TI-P64001, coated with molybdenum disulfide (MoS2), and fitted with a serrated locking ring made from corrosion resisting steel. This standard defines a strength class of 1,100 MPa at ambient temperature, ensuring high performance and reliability for critical aerospace assemblies. Covering configuration, dimensions, material specifications, surface treatment, marking, and designation, EN 4421:2007 supports compliance and consistency across the aerospace industry.
Key Topics
- Material Requirements
- Studs are manufactured from titanium alloy TI-P64001, known for its high strength-to-weight ratio and corrosion resistance.
- Serrated locking rings are made from corrosion resisting steel, providing additional durability in harsh environments.
- Surface Treatment
- The studs are coated with MoS2 (molybdenum disulfide) to reduce friction, enhance wear resistance, and prevent galling during installation and service.
- Strength Classification
- The specified minimum tensile strength is 1,100 MPa, ensuring robustness for demanding aerospace applications.
- Configuration and Dimensions
- Detailed requirements for configuration, dimensions, tolerances, and masses ensure interchangeability and precise fit within aerospace assemblies.
- Marking and Identification
- Marking requirements follow EN 2424 to guarantee traceability and proper identification of each component.
- Performance Testing
- Technical specifications, including rotational integrity of the locking ring, are provided to validate performance under operational conditions.
Applications
EN 4421:2007 is broadly applied across the aerospace industry where high-strength fastening solutions are critical:
- Aircraft Assembly: Used in structural joints where reliable stud fixation is required, particularly in areas subject to vibration and environmental exposure.
- Aerospace Engines: Ideal for connecting components where resistance to high tensile loads, corrosion, and wear is essential.
- Spacecraft Systems: Suitable for use in mechanisms that demand minimal maintenance and sustained integrity over long-duration missions.
- Defense Equipment: Applied to military aircraft and aerospace systems where compliance with international standards is mandatory for safety and interoperability.
Using studs conforming to EN 4421 ensures enhanced reliability, standardization, and ease of maintenance, supporting global procurement and replacement practices.
Related Standards
For enhanced understanding and broader context, EN 4421:2007 references and aligns with several pertinent aerospace standards:
- EN 2424: Aerospace series - Marking of aerospace products
- EN 3311: Aerospace series - Titanium alloy TI-P64001, annealed, bar for machining
- EN 4458: Aerospace series - Studs, MJ threads, in titanium alloy TI-P64001, MoS2 coated, with serrated locking ring in corrosion resisting steel
- ISO 3353: Aerospace - Rolled threads for bolts - Lead and runout requirements
- ISO 5855-2: Aerospace - MJ threads - Part 2: Limit dimensions for bolts and nuts
- AMS 5604R: Steel, corrosion resistant, bars, wire, and forgings
These standards together cover aspects such as material properties, thread dimensions, marking, and corrosion resistance, ensuring that parts manufactured to EN 4421:2007 are compatible with established aerospace industry practices.
By following EN 4421:2007, manufacturers and aerospace engineers can guarantee the use of high-quality, compliant components, supporting safety, performance, and interoperability in aerospace assemblies worldwide.
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Frequently Asked Questions
EN 4421:2007 is a standard published by the European Committee for Standardization (CEN). Its full title is "Aerospace series - Studs, in titanium alloy TI-P64001, MoS2 coated, with serrated locking ring in corrosion resisting steel - Strength class: 1 100 MPa (at ambient temperature)". This standard covers: This standard specifies the characteristics of studs in TI P64001, MoS2 coated, with serrated locking ring in corrosion resisting steel for aerospace applications. Strength class: 1 100 MPa )
This standard specifies the characteristics of studs in TI P64001, MoS2 coated, with serrated locking ring in corrosion resisting steel for aerospace applications. Strength class: 1 100 MPa )
EN 4421:2007 is classified under the following ICS (International Classification for Standards) categories: 49.030.20 - Bolts, screws, studs. The ICS classification helps identify the subject area and facilitates finding related standards.
EN 4421:2007 has the following relationships with other standards: It is inter standard links to EN 2424:2008, EN 4458:2005, EN 3311:2023, EN 840-6:2004+A1:2008, EN 12513:2000, EN 4460:2005, EN 4459:2005. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
EN 4421:2007 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Luft- und Raumfahrt - Stiftschrauben, aus Titanlegierung TI-P64001, MoS2 beschichtet, mit Ringsicherung aus korrosionsbeständigem Stahl - Festigkeitsklasse: 1 100 MPa (bei Raumtemperatur)Série aérospatiale - Goujons, en alliage de titane TI-P64001, revêtus MoS2, avec bague de verrouillage dentelée, en acier résistant à la corrosion - Classe de résistance: 1 100 MPa (à température ambiante)Aerospace series - Studs, in titanium alloy TI-P64001, MoS2 coated, with serrated locking ring in corrosion resisting steel - Strength class: 1 100 MPa (at ambient temperature)49.030.20Sorniki, vijaki, stebelni vijakiBolts, screws, studsICS:Ta slovenski standard je istoveten z:EN 4421:2007SIST EN 4421:2009en,de01-junij-2009SIST EN 4421:2009SLOVENSKI
STANDARD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 4421
June 2007 ICS 49.030.20 English Version
Aerospace series - Studs, in titanium alloy TI-P64001, MoS2 coated, with serrated locking ring in corrosion resisting steel - Strength class: 1 100 MPa (at ambient temperature)
Série aérospatiale - Goujons, en alliage de titane TI-P64001, revêtus MoS2, avec bague de verrouillage dentelée, en acier résistant à la corrosion - Classe de résistance: 1 100 MPa (à température ambiante)
Luft- und Raumfahrt - Stiftschrauben, aus Titanlegierung TI-P64001, MoS2 beschichtet, mit Ringsicherung aus korrosionsbeständigem Stahl - Festigkeitsklasse: 1 100 MPa (bei Raumtemperatur) This European Standard was approved by CEN on 26 October 2005.
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, 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: rue de Stassart, 36
B-1050 Brussels © 2007 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 4421:2007: ESIST EN 4421:2009
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