EN 4634:2009
(Main)Aerospace series - Screws, 100° countersunk head, six lobe recess, short thread, in heat resisting steel FE-PA2601 (A286), passivated - Classification: 900 MPa (at ambient temperature) / 650 °C
Aerospace series - Screws, 100° countersunk head, six lobe recess, short thread, in heat resisting steel FE-PA2601 (A286), passivated - Classification: 900 MPa (at ambient temperature) / 650 °C
This standard specifies the characteristics of screws with 100° countersunk head, with six lobes recess, short thread, in heat resisting steel FE-PA2601, passivated, for aerospace applications.
Luft- und Raumfahrt - 100°-Senkschrauben, kurzes Gewinde, Sechs-Bogenzahn, aus hochwarmfestem Stahl FE-PA2601 (A286), passiviert - Klasse: 900 MPa (bei Raumtemperatur) / 650 °C
Diese Norm legt die Eigenschaften für 100° Senkschrauben mit Sechs Bogenzahn, kurzes Gewinde, aus hochwarmfestem Stahl FE PA2601, passiviert zur Anwendung in der Luft und Raumfahrt fest.
Série aérospatiale - Vis, 100° à tête fraisée, à filetage court, à empreinte six lobes, en acier résistant à chaud FE-PA2601 (A286), passivées - Classification : 900 Mpa (à température ambiante) / 650°C
Aeronavtika - Vijaki, 100° ugrezna glava, šestzoba vdolbina, kratek navoj, iz toplotnoodpornega jekla FE-PA2601 (A286), pasivirani - Klasifikacija: 900 MPa (pri temperaturi okolice)/650 °C
General Information
- Status
- Published
- Publication Date
- 30-Jun-2009
- Withdrawal Date
- 30-Jan-2010
- Technical Committee
- ASD-STAN - Aerospace
- Drafting Committee
- ASD-STAN/D 3 - Mechanical
- Current Stage
- 9093 - Decision to confirm - Review Enquiry
- Start Date
- 21-Jan-2025
- Completion Date
- 28-Jan-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
Overview
EN 4634:2009 specifies the characteristics of aerospace screws with a 100° countersunk head, six-lobe recess, and short thread, manufactured in heat-resisting steel FE-PA2601 (A286) and passivated. The standard defines the mechanical classification 900 MPa (at ambient temperature) with applicability for elevated temperatures up to 650 °C. It is published by CEN for use across European national bodies and intended for aerospace fastener selection and procurement.
Key Topics
- Configuration, dimensions and tolerances: Head geometry, countersink angle and dimensional limits are specified; dimensions apply after surface treatment.
- Thread forms: MJ-type metric threads are referenced (see Table 1 in the standard for MJ3 to MJ12 size codes and associated length codes).
- Materials: Base material is heat-resisting steel FE-PA2601 (A286); associated material references include EN 2399 and EN 3639.
- Surface treatment: Passivation requirements are covered and reference EN 2516 for passivation and decontamination of corrosion-resistant steels.
- Tolerances of form and position: Geometrical tolerances reference ISO 7913.
- Designation and marking: A clear designation system and marking rules (per EN 2424) ensure traceability-example identity block format: EN4634-040003.
- Normative references: The document relies on standards such as ISO 3353-1, ISO 5855-2, ISO 7913, EN 2399, EN 2516, EN 2576 and EN 3911 among others.
Applications
EN 4634 screws are intended for aerospace assemblies where a combination of flush countersunk fastening, high strength, and high-temperature performance is required. Practical applications and benefits include:
- Use in structural and airframe components where a smooth external surface is required.
- High-strength performance at ambient conditions (900 MPa) and maintained integrity for elevated temperature exposure up to 650 °C.
- Passivation improves corrosion resistance and supports long-term durability in harsh aerospace environments.
- The six-lobe recess (EN 3911) supports reliable torque engagement and repeatable installation in production and maintenance operations.
Related Standards
Key related documents referenced in EN 4634:2009:
- ISO 3353-1 - Rolled external threads (lead and runout)
- ISO 5855-2 - MJ threads limit dimensions
- ISO 7913 - Tolerances of form and position
- EN 2399 / EN 3639 - FE-PA2601 material specifications
- EN 2516 - Passivation of corrosion resisting steels
- EN 2576 - Technical specification for related A286 fasteners
For procurement, engineering and quality teams, EN 4634:2009 provides the standardized specification needed to select, mark and verify countersunk six-lobe fasteners made from FE-PA2601 (A286) for reliable aerospace service at elevated temperatures.
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Frequently Asked Questions
EN 4634:2009 is a standard published by the European Committee for Standardization (CEN). Its full title is "Aerospace series - Screws, 100° countersunk head, six lobe recess, short thread, in heat resisting steel FE-PA2601 (A286), passivated - Classification: 900 MPa (at ambient temperature) / 650 °C". This standard covers: This standard specifies the characteristics of screws with 100° countersunk head, with six lobes recess, short thread, in heat resisting steel FE-PA2601, passivated, for aerospace applications.
This standard specifies the characteristics of screws with 100° countersunk head, with six lobes recess, short thread, in heat resisting steel FE-PA2601, passivated, for aerospace applications.
EN 4634:2009 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 4634:2009 has the following relationships with other standards: It is inter standard links to EN 3911:2010, EN 2424:2008, EN 2399:2008, EN 840-6:2004+A1:2008, EN 14460:2006, EN 2516:2023. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
EN 4634:2009 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.Aeronavtika - Vijaki, 100° ugrezna glava, šestzoba vdolbina, kratek navoj, iz toplotnoodpornega jekla FE-PA2601 (A286), pasivirani - Klasifikacija: 900 MPa (pri temperaturi okolice)/650 °CLuft- und Raumfahrt – 100° Senkschrauben, kurzes Gewinde, Sechs-Bogenzahn, aus hochwarmfester Stahl FE-PA2601 (A286), passiviert - Klasse: 900 MPa (bei Raumtemperatur)/650° CSérie aérospatiale - Vis, 100° à tête fraisée, à filetage court, à empreinte six lobes, en acier résistant à chaud FE-PA2601 (A286), passivées - Classification: 900 Mpa (à température ambiante)/650°CAerospace series - Screws, 100° countersunk head, six lobe recess, short thread, in heat resisting steel FE-PA2601 (A286), passivated - Classification: 900 MPa (at ambient temperature)/650 °C49.030.20Sorniki, vijaki, stebelni vijakiBolts, screws, studsICS:Ta slovenski standard je istoveten z:EN 4634:2009SIST EN 4634:2009en01-oktober-2009SIST EN 4634:2009SLOVENSKI
STANDARD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 4634
July 2009 ICS 49.030.20 English Version
Aerospace series - Screws, 100° countersunk head, six lobe recess, short thread, in heat resisting steel FE-PA2601 (A286), passivated - Classification: 900 MPa (at ambient temperature) / 650 °C
Série aérospatiale - Vis, 100° à tête fraisée, à filetage court, à empreinte six lobes, en acier résistant à chaud FE-PA2601 (A286), passivées - Classification : 900 Mpa (à température ambiante) / 650 °C
Luft- und Raumfahrt – 100° Senkschrauben, kurzes Gewinde, Sechs-Bogenzahn, aus hochwarmfester Stahl FE-PA2601 (A286), passiviert - Klasse: 900 MPa (bei Raumtemperatur) / 650 °C This European Standard was approved by CEN on 12 March 2009.
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:
Avenue Marnix 17,
B-1000 Brussels © 2009 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 4634:2009: ESIST EN 4634:2009
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