EN 3712:2007
(Main)Aerospace series - Nuts, anchor, self-locking, one lug, fixed, reduced series, with counterbore, in steel, cadmium plated, MoS2 lubricated - Classification: 1 100 MPa (at ambient temperature) / 235 °C
Aerospace series - Nuts, anchor, self-locking, one lug, fixed, reduced series, with counterbore, in steel, cadmium plated, MoS2 lubricated - Classification: 1 100 MPa (at ambient temperature) / 235 °C
This standard specifies characteristics for one lug, reduced series, counterbored, fixed anchor nuts, with a self-locking feature achieved by forming the upper portion out-of-round, in steel, cadmium plated, MoS2 lubricated, classification 1 100 MPa ) / 235 °C. )
Luft-und Raumfahrt - Annietmuttern, selbstsichernd, einseitiger verkürzter Flansch, mit zylindrischer Aussenkung, aus Stahl, verkadmet, MoS2-geschmiert - Klasse: 1 100 MPa (bei Raumtemperatur) / 235 °C
Diese Norm legt Eigenschaften für MoS2-geschmierte Annietmuttern aus verkadmetem Stahl mit verkürztem einseitigem Flansch, zylindrischer Aussenkung und einer selbstsichernden Eigenschaft, erzielt durch unrunde Verformung des Oberteils in der Klasse: 1 100 MPa )/235 °C ), fest.
Série aérospatiale - Écrous à river, à freinage interne, fixes, simple patte, série reduite, avec chambrage, en acier, cadmiés, lubrifiés MoS2 - Classification : 1 100 MPa (à température ambiante) / 235 °C
Aeronavtika - Zakovne matice, samovarovalne, enostranske, iz jekla, prevlečene s kadmijem, namazane z MoS2 - Klasifikacija: 1100 MPa (pri temperaturi okolice)/235 °C
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
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
Overview
EN 3712:2007 is a European standard developed by CEN for aerospace self-locking anchor nuts with a single lug, reduced series, fixed design, and counterbore. These anchor nuts are manufactured in steel, cadmium plated, and lubricated with molybdenum disulphide (MoS₂). The standard specifies the mechanical and dimensional requirements for nuts with a classification of 1 100 MPa (at ambient temperature) and a maximum service temperature of 235 °C, making them suitable for demanding aerospace applications.
Self-locking is achieved by forming the upper portion of the nut out-of-round, providing reliable vibration resistance without separate locking inserts. The standard ensures high-quality, consistent, and safe mechanical performance of anchor nuts used in critical aerospace assemblies.
Key Topics
- Product Scope: Focuses specifically on self-locking, one-lug, fixed anchor nuts in reduced series with counterbore, manufactured from cadmium-plated steel and lubricated with MoS₂.
- Classification: Nuts are classified by ultimate tensile strength (1 100 MPa) and maximum service temperature (235 °C).
- Self-Locking Feature: Achieved by out-of-round forming in the nut's upper section, enhancing vibration resistance.
- Materials and Surface Treatments:
- Steel according to EN 2542 or EN 2543.
- Cadmium plating (minimum 5 µm on threads) specified by EN 2133, for corrosion resistance.
- MoS₂ lubrication as detailed in EN 2491, for optimal installation and service life.
- Dimensional and Tolerance Requirements: Defined in compliance with ISO 3191 and ISO 5855-2, ensuring compatibility and interchangeability in aerospace assemblies.
- Marking and Identification: Marking requirements are outlined in EN 2424 to assure traceability in production and use.
Applications
EN 3712:2007 anchor nuts are widely employed in the aerospace industry, where safety, reliability, and resistance to vibration are paramount. Practical applications include:
- Aircraft and Spacecraft Structure Assembly: Used for fastening panels, hatches, or access points that require secure, vibration-resistant fasteners.
- Engine, Landing Gear, and Fuselage Connections: Applied in critical areas exposed to high loads and fluctuating temperatures.
- Maintenance and Repair Operations (MRO): Supports easy, secure mounting and replacement of components in accordance with rigorous aerospace standards.
- Other High-Performance Uses: While designed for aerospace, such anchor nuts may be used in defense, transportation, and industrial sectors demanding similar performance characteristics.
The specification for cadmium plating and MoS₂ lubrication ensures extended corrosion protection and consistent torque characteristics, even in harsh environments.
Related Standards
EN 3712:2007 references and interfaces with several other key aerospace standards that enhance its utility and ensure comprehensive compliance:
- ISO 3191: Defines dimensions for similar MJ-threaded anchor nuts in aerospace.
- ISO 5855-2: Specifies limit dimensions for bolts and nuts with MJ threads.
- ISO 8788: Prescribes tolerances of form and position for metric aerospace nuts.
- EN 2133: Regulates cadmium plating of steels used in aerospace components.
- EN 2491: Outlines MoS₂ coating methods for aerospace products.
- EN 2424: Establishes marking requirements for aerospace products.
- EN 9100 & EN 9133: Focus on quality management systems and qualification procedures for aerospace standard parts.
These related standards together provide a robust framework for the manufacture, qualification, and use of aerospace anchor nuts, ensuring safety, interoperability, and international recognition.
By following EN 3712:2007, aerospace manufacturers and suppliers ensure compliance with industry best practices, supporting reliable performance and global market access for their fastening solutions.
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Frequently Asked Questions
EN 3712:2007 is a standard published by the European Committee for Standardization (CEN). Its full title is "Aerospace series - Nuts, anchor, self-locking, one lug, fixed, reduced series, with counterbore, in steel, cadmium plated, MoS2 lubricated - Classification: 1 100 MPa (at ambient temperature) / 235 °C". This standard covers: This standard specifies characteristics for one lug, reduced series, counterbored, fixed anchor nuts, with a self-locking feature achieved by forming the upper portion out-of-round, in steel, cadmium plated, MoS2 lubricated, classification 1 100 MPa ) / 235 °C. )
This standard specifies characteristics for one lug, reduced series, counterbored, fixed anchor nuts, with a self-locking feature achieved by forming the upper portion out-of-round, in steel, cadmium plated, MoS2 lubricated, classification 1 100 MPa ) / 235 °C. )
EN 3712:2007 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 3712:2007 has the following relationships with other standards: It is inter standard links to EN 2133:2020, EN 9100:2018, EN 840-6:2004+A1:2008, EN 2491:2011, EN 2424:2008, EN ISO 14589:2000, EN 2543:2009, EN 9133:2018, EN ISO 15792-1:2008, EN 2542:2008. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
EN 3712:2007 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.ƒ&Luft-und Raumfahrt - Annietmuttern, selbstsichernd, einseitiger verkürzter Flansch, mit zylindrischer Aussenkung, aus Stahl, verkadmet, MoS2-geschmiert - Klasse: 1 100 MPa (bei Raumtemperatur) / 235 °CSérie aérospatiale - Écrous à river, à freinage interne, fixes, simple patte, série reduite, avec chambrage, en acier, cadmiés, lubrifiés MoS2 - Classification : 1 100 MPa (à température ambiante) / 235 °CAerospace series - Nuts, anchor, self-locking, one lug, fixed, reduced series, with counterbore, in steel, cadmium plated, MoS2 lubricated - Classification: 1 100 MPa (at ambient temperature) / 235 °C49.030.30MaticeNutsICS:Ta slovenski standard je istoveten z:EN 3712:2007SIST EN 3712:2009en,de01-julij-2009SIST EN 3712:2009SLOVENSKI
STANDARD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 3712
June 2007 ICS 49.030.30 English Version
Aerospace series - Nuts, anchor, self-locking, one lug, fixed, reduced series, with counterbore, in steel, cadmium plated, MoS2 lubricated - Classification: 1 100 MPa (at ambient temperature) / 235 °C
Série aérospatiale - Écrous à river, à freinage interne, fixes, simple patte, série reduite, avec chambrage, en acier, cadmiés, lubrifiés MoS2 - Classification : 1 100 MPa (à température ambiante) / 235 °C
Luft-und Raumfahrt - Annietmuttern, selbstsichernd, einseitiger verkürzter Flansch, mit zylindrischer Aussenkung, aus Stahl, verkadmet, MoS2 geschmiert - Klasse: 1 100 MPa (bei Raumtemperatur) / 235 °C This European Standard was approved by CEN on 20 April 2006.
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 © 2006 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 3712:2007: ESIST EN 3712:2009
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