EN 4121:2015
(Main)Aerospace series - Shank nuts, serrated, self-locking, in heat resisting steel FE-PA2601 (A286), silver plated on thread - Classification: 1 100 MPa (at ambient temperature) / 650 °C
Aerospace series - Shank nuts, serrated, self-locking, in heat resisting steel FE-PA2601 (A286), silver plated on thread - Classification: 1 100 MPa (at ambient temperature) / 650 °C
This standard specifies the characteristics of self-locking serrated shank nuts in FE-PA2601, silver plated on thread, for aerospace applications.
Classification: 1 100 MPa ) / 650 °C ).
Luft- und Raumfahrt - Einnietmuttern, verzahnt, selbstsichernd, aus hochwarmfestem Stahl FE-PA2601 (A286), Gewinde versilbert - Klasse: 1 100 MPa (bei Raumtemperatur) / 650 °C
Série aérospatiale - Écrous dentelés à sertir, à freinage interne, en acier résistant à chaud FE-PA2601 (A286), argentés sur filetage - Classification: 1 100 MPa (à température ambiante) / 650 °C
La présente norme spécifie les caractéristiques des écrous dentelés à sertir, à freinage interne, en FE PA2601, argentés sur filetage, pour applications aérospatiales.
Classification : 1 100 MPa ) / 650 °C ).
Aeronavtika - Sidrne/utrdilne matice, samoblokirne, nazobčane, iz toplotnoodpornega jekla FE-PA2601 (A286), posrebreni navoji - Klasifikacija: 1 100 MPa (pri okoljski temperaturi) / 650 °C
Ta standard določa lastnosti samoblokirnih nazobčanih sidrnih matic s posrebreni navoji v FE-PA2601 za uporabo v aeronavtiki. Razvrstitev: 1 100 MPa 1)/650 °C 2).
General Information
- Status
- Published
- Publication Date
- 21-Jul-2015
- Withdrawal Date
- 30-Jan-2016
- Technical Committee
- ASD-STAN - Aerospace
- Drafting Committee
- ASD-STAN/D 3 - Mechanical
- Current Stage
- 6060 - Definitive text made available (DAV) - Publishing
- Start Date
- 22-Jul-2015
- Completion Date
- 22-Jul-2015
Relations
- Effective Date
- 25-Jun-2014
Overview
EN 4121:2015 specifies the characteristics of aerospace-series shank nuts - serrated, self-locking, manufactured from heat-resisting steel FE-PA2601 (A286) and silver plated on the thread. The standard applies to nuts classified 1 100 MPa (at ambient temperature) / 650 °C, and is intended for aerospace applications where high temperature resistance and secure self-locking performance are required. Dimensions, tolerances and marking requirements are given for standard MJ thread sizes (see Table 1 in the standard). Two permitted configurations (Style 1 and Style 2) are covered.
Key topics and requirements
- Material: Heat resisting steel FE-PA2601 (A286) as referenced to EN 2399 or EN 3639.
- Mechanical classification: Minimum tensile capability 1 100 MPa at ambient temperature; maximum test temperature 650 °C.
- Configuration & dimensions: Detailed dimensional and tolerance requirements (MJ thread series) after silver plating - configurations Style 1 and Style 2 allowed; forming out-of-round in the self‑locking zone is permitted.
- Surface treatment: Silver plating on thread per EN 2786. Minimum thread coating thickness: ≥ 5 µm on thread flanks for MJ6 and complete coverage (no thickness requirement) for MJ5. Coating may optionally extend to counterbore and chamfers.
- Marking & identification: Marking in accordance with EN 2424, with designation and identity blocks as specified.
- Installation: Installation procedure and installation-hole design referenced to EN 3064 and EN 3065; attention required for notch sensitivity of host materials.
- Referenced specifications: Technical specification and complementary requirements are linked to EN 3004 and ISO 5855-2 for MJ thread limits.
Applications
- Use where high-temperature resistance and reliable self-locking retention are essential in aerospace assemblies (e.g., engine and airframe fastenings exposed to elevated temperatures).
- Suitable for manufacturers of aerospace fasteners, OEM component designers, procurement specialists specifying hardware for high‑temperature environments, and maintenance/repair organizations requiring certified parts.
Who will use EN 4121:2015
- Fastener manufacturers and heat‑treatment/finishing shops producing FE‑PA2601 (A286) nuts.
- Aerospace design and mechanical engineers specifying high‑temperature self‑locking shank nuts.
- Quality, procurement and certification teams ensuring compliance with European aerospace fastener standards.
- MRO and installation teams following the prescribed installation procedures and hole designs.
Related standards
- EN 2399, EN 2786, EN 3004, EN 3064, EN 3065, EN 3639, ISO 5855-2
Keywords: EN 4121:2015, shank nuts, serrated self‑locking, FE‑PA2601, A286, silver plated thread, aerospace fasteners, MJ threads, high temperature 650 °C, 1100 MPa.
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Frequently Asked Questions
EN 4121:2015 is a standard published by the European Committee for Standardization (CEN). Its full title is "Aerospace series - Shank nuts, serrated, self-locking, in heat resisting steel FE-PA2601 (A286), silver plated on thread - Classification: 1 100 MPa (at ambient temperature) / 650 °C". This standard covers: This standard specifies the characteristics of self-locking serrated shank nuts in FE-PA2601, silver plated on thread, for aerospace applications. Classification: 1 100 MPa ) / 650 °C ).
This standard specifies the characteristics of self-locking serrated shank nuts in FE-PA2601, silver plated on thread, for aerospace applications. Classification: 1 100 MPa ) / 650 °C ).
EN 4121:2015 is classified under the following ICS (International Classification for Standards) categories: 49.030.30 - Nuts. The ICS classification helps identify the subject area and facilitates finding related standards.
EN 4121:2015 has the following relationships with other standards: It is inter standard links to EN 4121:2004. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
EN 4121:2015 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 - Einnietmuttern, verzahnt, selbstsichernd, aus hochwarmfestem Stahl steel FE-PA2601 (A286), Gewinde versilbert - Klasse: 1 100 MPa (bei Raumtemperatur) / 650 °CSérie aérospatiale - Écrous dentelés à sertir, à freinage interne, en acier résistant à chaud FE-PA2601 (A286), argentés sur filetage - Classification: 1 100 MPa (à température ambiante) / 650 °CAerospace series - Shank nuts, serrated, self-locking, in heat resisting steel FE-PA2601 (A286), silver plated on thread - Classification: 1 100 MPa (at ambient temperature) / 650 °C49.030.30MaticeNutsICS:Ta slovenski standard je istoveten z:EN 4121:2015SIST EN 4121:2015en,fr,de01-oktober-2015SIST EN 4121:2015SLOVENSKI
STANDARDSIST EN 4121:20051DGRPHãþD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 4121
July 2015 ICS 49.030.30 Supersedes EN 4121:2004English Version
Aerospace series - Shank nuts, serrated, self-locking, in heat resisting steel FE-PA2601 (A286), silver plated on thread - Classification: 1 100 MPa (at ambient temperature) / 650 °C
Série aérospatiale - Écrous dentelés à sertir, à freinage interne, en acier résistant à chaud FE-PA2601 (A286), argentés sur filetage - Classification: 1 100 MPa (à température ambiante) / 650 °C
Luft- und Raumfahrt - Einnietmuttern, verzahnt, selbstsichernd, aus hochwarmfestem Stahl steel FE-PA2601 (A286), Gewinde versilbert - Klasse: 1 100 MPa (bei Raumtemperatur) / 650 °C This European Standard was approved by CEN on 8 November 2014.
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-CENELEC 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-CENELEC 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre:
Avenue Marnix 17,
B-1000 Brussels © 2015 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 4121:2015 ESIST EN 4121:2015
Page European foreword .3 1 Scope .4 2 Normative references .4 3 Requirements characteristics .4 4 Designation .6 5 Marking .6 6 Technical specification .6 7 Installation .6 Annex A (informative) Standard evolution form .7
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