EN 4635:2009
(Main)Aerospace series - Screws, 100° countersunk head, six lobes recess, short thread, in heat resisting nickel base alloy NI-PH2601 (Inconel 718) - Classification: 1 270 MPa (at ambient temperature) / 650 °C
Aerospace series - Screws, 100° countersunk head, six lobes recess, short thread, in heat resisting nickel base alloy NI-PH2601 (Inconel 718) - Classification: 1 270 MPa (at ambient temperature) / 650 °C
This standard specifies the characteristics of screws with 100° countersunk head, with six lobe recess, short thread, in heat resisting nickel base alloy NI-PH2601 (Inconel 718), for aerospace applications.
Luft- und Raumfahrt - 100°-Senkschrauben, kurzes Gewinde, Sechs-Bogenzahn, aus hochwarmfester Nickelbasislegierung NI-PH2601 (Inconel 718) - Klasse: 1 270 MPa (bei Raumtemperatur) / 650 °C
Diese Norm legt die Eigenschaften für 100°-Senkschrauben mit Sechs-Bogenzahn und kurzem Gewinde aus
hochwarmfester Nickelbasislegierung NI-PH2601 (Inconel 718) zur Verwendung in der Luft- und Raumfahrt
fest.
Série aérospatiale - Vis, 100° à tête fraisée, à filetage court, à empreinte six lobes, en alliage résistant à chaud à base de nickel NI-PH2601 (Inconel 718) - Classification : 1 270 Mpa (à température ambiante) / 650°C
Aeronavtika - Vijaki, 100° ugrezna glava, šestzoba vdolbina, kratek navoj, iz toplotnoodporne zlitine na nikljevi osnovi NI-PH2601 (Inconel 718) - Klasifikacija: 1270 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 4635:2009 is a CEN aerospace standard that specifies the characteristics of screws with a 100° countersunk head, six‑lobe recess, short thread, made from the heat‑resisting nickel‑base alloy NI‑PH2601 (Inconel 718). The screws are classified for a tensile strength of 1270 MPa at ambient temperature and for use up to 650 °C. The standard was prepared by ASD‑STAN and approved by CEN in 2009.
Key topics
- Product configuration and dimensions: detailed dimensional tables and a figure define head geometry, recess, thread lengths and mass. Sizes covered include MJ3 to MJ12 thread designations (see Table 1 in the standard).
- Material: specification of the heat‑resisting nickel‑base alloy NI‑PH2601 (Inconel 718) and reference to EN 2952 for bar material and mechanical properties.
- Mechanical classification: tensile classification 1270 MPa (ambient) / 650 °C to guide selection for high‑temperature aerospace applications.
- Threads and tolerances: MJ thread series conforming to ISO/EN thread standards (e.g., ISO 3353‑1, ISO 5855‑2); tolerances of form and position according to ISO 7913 (values quoted in micrometres, applicable prior to surface treatment).
- Surface treatment and corrosion control: references to EN 2516 for passivation and decontamination of nickel base alloys.
- Designation and marking: standard gives an example designation format (e.g., EN4635‑040003) and references EN 2424 for marking requirements.
- Related technical specification: EN 2583 referenced for detailed technical specification.
Applications
- Fasteners for aerospace structures and engine components requiring high strength and resistance to elevated temperatures (hot sections, exhaust systems, turbine housings).
- Situations demanding a flush countersunk finish with a secure six‑lobe (Torx‑style) recess, short thread engagement and high fatigue/creep resistance.
- Use cases where material traceability, marking and standardized tolerance control are required by procurement and certification processes.
Who uses this standard
- Aerospace fastener manufacturers and forging suppliers
- Design and stress engineers specifying hardware for high‑temperature zones
- Quality assurance, inspection and procurement teams verifying conformity (marking, material, thread tolerances)
- Maintenance and overhaul organizations requiring correct replacement parts
Related standards
- EN 2952 (NI‑PH2601 bar material), EN 2583 (technical specification), EN 2516 (passivation), EN 2424 (marking)
- ISO 3353‑1, ISO 5855‑2 (threads), ISO 7913 (form/position tolerances), EN 3911 (six‑lobe recess geometry)
Keywords: EN 4635:2009, aerospace screws, Inconel 718, NI‑PH2601, 100° countersunk head, six‑lobe recess, high‑temperature fasteners, MJ threads.
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Frequently Asked Questions
EN 4635:2009 is a standard published by the European Committee for Standardization (CEN). Its full title is "Aerospace series - Screws, 100° countersunk head, six lobes recess, short thread, in heat resisting nickel base alloy NI-PH2601 (Inconel 718) - Classification: 1 270 MPa (at ambient temperature) / 650 °C". This standard covers: This standard specifies the characteristics of screws with 100° countersunk head, with six lobe recess, short thread, in heat resisting nickel base alloy NI-PH2601 (Inconel 718), for aerospace applications.
This standard specifies the characteristics of screws with 100° countersunk head, with six lobe recess, short thread, in heat resisting nickel base alloy NI-PH2601 (Inconel 718), for aerospace applications.
EN 4635:2009 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 4635:2009 has the following relationships with other standards: It is inter standard links to EN 3911:2010, EN 2424:2008, EN 2583:2019, 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 4635:2009 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 toplotnoodporne zlitine na nikljevi osnovi NI-PH2601 (Inconel 718) - Klasifikacija: 1270 MPa (pri temperaturi okolice)/650 °CLuft- und Raumfahrt – 100° Senkschrauben, kurzes Gewinde, Sechs-Bogenzahn, aus hochwarmfester Nickelbasislegierung NI-PH2601 (Inconel 718) - Klasse: 1270 MPa (bei Raumtemperatur)/650° CSérie aérospatiale - Vis, 100° à tête fraisée, à filetage court, à empreinte six lobes, en alliage résistant à chaud à base de nickel NI-PH2601 (Inconel 718) - Classification : 1270 Mpa (à température ambiante)/650°CAerospace series - Screws, 100° countersunk head, six lobes recess, short thread, in heat resisting nickel base alloy NI-PH2601 (Inconel 718) - Classification: 1270 MPa (at ambient temperature)/650 °C49.030.20Sorniki, vijaki, stebelni vijakiBolts, screws, studsICS:Ta slovenski standard je istoveten z:EN 4635:2009SIST EN 4635:2009en01-oktober-2009SIST EN 4635:2009SLOVENSKI
STANDARD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 4635
July 2009 ICS 49.030.20 English Version
Aerospace series - Screws, 100° countersunk head, six lobes recess, short thread, in heat resisting nickel base alloy NI-PH2601 (Inconel 718) - Classification: 1 270 MPa (at ambient temperature) / 650 °C
Série aérospatiale - Vis, 100° à tête fraisée, à filetage court, à empreinte six lobes, en alliage résistant à chaud à base de nickel NI-PH2601 (Inconel 718) - Classification : 1 270 Mpa (à température ambiante) / 650 °C
Luft- und Raumfahrt – 100° Senkschrauben, kurzes Gewinde, Sechs-Bogenzahn, aus hochwarmfester Nickelbasislegierung NI-PH2601 (Inconel 718) - Klasse: 1 270 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 4635:2009: ESIST EN 4635:2009
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