EN 3726:2004
(Main)Aerospace series - Nuts, self-locking, clip, in heat resisting steel FE-PA2601 (A286), MoS2 coated - Classification: 1 100 MPa (at ambient temperature) / 425 °C
Aerospace series - Nuts, self-locking, clip, in heat resisting steel FE-PA2601 (A286), MoS2 coated - Classification: 1 100 MPa (at ambient temperature) / 425 °C
This standard specifies the characteristics of self-locking clip nuts in FE-PA2601, MoS2 coated, for aerospace applications.
Classification: 1 100 MPa / 425 °C
Luft- und Raumfahrt - Klemmmuttern, selbstsichernd, aus hochwarmfestem Stahl FE-PA2601 (A286), MoS2-beschichtet - Klasse: 1 100 MPa (bei Raumtemperatur) / 425 °C
Diese Norm legt die Eigenschaften von selbstsichernden Klemmmuttern aus Stahl FE PA2601 (A286), MoS2 beschichtet, für Anwendungen in der Luft- und Raumfahrt fest.
Klasse 1 100 MPa ) / 425 °C )
Série aérospatiale - Écrous à pincer, à freinage interne, en acier résistant à chaud FE-PA2601 (A286), revêtus MoS2 - Classification : 1 100 MPa (à température ambiante ) / 425 °C
Aerospace series - Nuts, self-locking, clip, in heat resisting steel FE-PA2601 (A286), MoS2 coated - Classification: 1 100 MPa (at ambient temperature) / 425 °C
General Information
- Status
- Published
- Publication Date
- 09-Nov-2004
- Withdrawal Date
- 30-May-2005
- 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
- 11-Feb-2026
Relations
- Effective Date
- 22-Dec-2008
- 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
- 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 3726:2004 is a European standard developed by CEN for the aerospace industry, specifying the requirements for self-locking clip nuts manufactured from heat-resisting steel FE-PA2601 (A286) with MoS₂ (molybdenum disulphide) coating. These fasteners are engineered to deliver reliable self-locking performance at high mechanical stress levels (1,100 MPa at ambient temperature) and elevated temperatures (up to 425°C). The standard ensures product consistency and interoperability for critical aerospace applications where safety and durability are paramount.
Key Topics
The main areas addressed in EN 3726:2004 include:
- Material Specification: Defines use of FE-PA2601 (A286), a heat-resisting steel alloy, suitable for high temperature and stress conditions.
- Coating Requirements: Mandates MoS₂ coating, providing reduced friction and enhancing resistance to wear and corrosion.
- Mechanical Classification: Specifies classification at 1,100 MPa at ambient temperature and service up to 425°C.
- Design and Dimensions: Establishes permitted forms and maximum dimensions to ensure interchangeability, while allowing minor manufacturer variations.
- Marking and Identification: Requires product marking per EN 2424 to track compliance and support traceability.
- Reference to Additional Standards: Integrates with other aerospace standards for threads, lubricants, and technical specifications, ensuring holistic performance and compatibility.
Applications
EN 3726:2004 self-locking clip nuts are primarily used in the following aerospace applications:
- Aircraft Structures: Suitable for securing panels, brackets, and components in high-vibration areas, where self-locking resistance is critical.
- Jet Engines and Powerplants: The combination of A286 alloy and MoS₂ coating withstands thermal cycling and mechanical loads typical in engine bays and hot zones.
- Satellite and Spacecraft Assemblies: Reliable fastening and self-locking features support demanding requirements for structural integrity in extreme operational conditions.
- Maintenance and MRO (Maintenance, Repair, Overhaul): Provides standardization for part replacement, facilitating supply chain consistency and reducing the risk of mismatched components.
The use of EN 3726:2004 nuts ensures reliable fastening solutions in environments demanding high mechanical strength, temperature resistance, and secure self-locking capability.
Related Standards
EN 3726:2004 references and aligns with several key international aerospace fastener standards, including:
- ISO 5855-2: Limit dimensions for MJ threads (bolts and nuts), critical for thread compatibility.
- EN 2424: Aerospace marking requirements, ensuring conformity and traceability of products.
- EN 2491: Defines methods for applying molybdenum disulphide dry lubricant coatings.
- EN 3638 & EN 3639: Specification for FE-PA2601 alloy in various product forms and treatments.
- EN 3752: Related technical specifications for self-locking nuts in the same material and coating classification.
Adhering to EN 3726:2004 helps manufacturers, suppliers, and aerospace operators achieve international quality benchmarks, streamline maintenance, and assure end-user safety.
Keywords: EN 3726:2004, self-locking clip nuts, aerospace fasteners, heat resisting steel, FE-PA2601, A286, MoS₂ coating, high-temperature resistance, aerospace standard, CEN, mechanical strength, aircraft components, traceability, maintenance, MJ threads.
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Frequently Asked Questions
EN 3726:2004 is a standard published by the European Committee for Standardization (CEN). Its full title is "Aerospace series - Nuts, self-locking, clip, in heat resisting steel FE-PA2601 (A286), MoS2 coated - Classification: 1 100 MPa (at ambient temperature) / 425 °C". This standard covers: This standard specifies the characteristics of self-locking clip nuts in FE-PA2601, MoS2 coated, for aerospace applications. Classification: 1 100 MPa / 425 °C
This standard specifies the characteristics of self-locking clip nuts in FE-PA2601, MoS2 coated, for aerospace applications. Classification: 1 100 MPa / 425 °C
EN 3726:2004 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 3726:2004 has the following relationships with other standards: It is inter standard links to EN 3726:2003, EN 3752:2004, EN 2424:2008, EN 2491:2011, EN 3638:2025, EN 840-6:2004+A1:2008, EN ISO 1680:1999, EN ISO 9612:2025, EN ISO 8528-10:2022, EN ISO 16283-2:2020, EN ISO 3382-3:2022, EN ISO 2922:2020, EN ISO 3381:2021, EN ISO 7235:2009, EN ISO 11957:2009. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
EN 3726:2004 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)
SLOVENSKI STANDARD
01-junij-2005
1DGRPHãþD
SIST EN 3726:2004
Aerospace series - Nuts, self-locking, clip, in heat resisting steel FE-PA2601
(A286), MoS2 coated - Classification: 1 100 MPa (at ambient temperature) / 425 °C
Aerospace series - Nuts, self-locking, clip, in heat resisting steel FE-PA2601 (A286),
MoS2 coated - Classification: 1 100 MPa (at ambient temperature) / 425 °C
Luft- und Raumfahrt - Klemmmuttern, selbstsichernd, aus hochwarmfestem Stahl FE-
PA2601 (A286), MoS2-beschichtet - Klasse: 1 100 MPa (bei Raumtemperatur) / 425 °C
Série aérospatiale - Écrous a pincer, a freinage interne, en acier résistant a chaud FE-
PA2601 (A286), revetus MoS2 - Classification : 1 100 MPa (a température ambiante ) /
425 °C
Ta slovenski standard je istoveten z: EN 3726:2004
ICS:
49.030.30 Matice Nuts
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD
EN 3726
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2004
ICS 49.030.30 Supersedes EN 3726:2003
English version
Aerospace series - Nuts, self-locking, clip, in heat resisting steel
FE-PA2601 (A286), MoS2 coated - Classification: 1 100 MPa (at
ambient temperature) / 425° C
Série aérospatiale - Écrous à pincer, à freinage interne, en Luft- und Raumfahrt - Klemmuttern, selbstsichernd, aus
acier résistant à chaud FE-PA2601 (A286), revêtus MoS2 - hochwarmfestem Stahl FE-PA2601 (A286), MoS2-
Classification : 1 100 MPa (à température ambiante ) / 425° beschichtet - Klasse: 1 100 MPa (bei Raumtemperatur) /
C 425° C
This European Standard was approved by CEN on 11 September 2003.
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 Central Secretariat 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 Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
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© 2004 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 3726:2004: E
worldwide for CEN national Members.
Contents Page
Foreword.3
1 Scope .4
2 Normative references .4
3 Required characteristics.4
4 Designation .6
5 Marking .6
6 Technical specification .6
SIST EN
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