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
- 09-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 aerospace standard that specifies the characteristics and requirements for self-locking, one lug, fixed anchor nuts used in high-strength steel applications. These nuts belong to the reduced series with a counterbore design, and they feature cadmium plating with MoS2 (molybdenum disulphide) lubrication to ensure optimal performance and corrosion resistance. The standard classifies these nuts for use at 1100 MPa tensile strength at ambient temperature and up to 235 °C, making them suitable for demanding aerospace environments where both strength and temperature resistance are critical.
Developed by the Aerospace and Defence Industries Association of Europe (ASD-STAN) and approved by the European Committee for Standardization (CEN), EN 3712:2007 establishes dimensions, materials, surface treatments, and marking requirements to ensure consistent quality and interchangeability across the aerospace industry.
Key Topics
Nut Configuration and Dimensions
EN 3712 outlines detailed dimensional specifications for one lug, reduced series anchor nuts with a counterbore, ensuring compatibility with matched bolts and aerospace assemblies. Dimensions adhere to ISO 3191 and tolerances conform to ISO 8788.Material Requirements
The nuts are manufactured from steel conforming to EN 2542 or EN 2543, providing the necessary mechanical strength to withstand up to 1100 MPa load classifications.Surface Treatment and Lubrication
Cadmium plating per EN 2133 is applied with a minimum thickness of 5 µm on threads and contact surfaces for corrosion protection. MoS2 dry lubrication per EN 2491 reduces friction and prevents galling during installation and operation.Self-Locking Feature
Achieved by deforming the upper portion of the nut out-of-round, the self-locking property ensures the nut maintains its position under vibration and thermal cycling, a crucial factor in aerospace fasteners.Temperature Classification
The nuts retain their mechanical properties up to 235 °C without permanent alteration, limited by the cadmium plating’s stability.Marking and Identification
Marking guidelines follow EN 2424 (style N), allowing for traceability and verification of nut compliance with this standard.
Applications
EN 3712:2007 nuts are essential components in aerospace constructions, including:
- Aircraft airframe assemblies where reliable, vibration-resistant fastening is necessary.
- Engine mountings and structures exposed to elevated temperatures (up to 235 °C).
- Defense aerospace systems requiring standardized, interchangeable nuts with high mechanical strength.
- High-performance fastening systems where self-locking functionality reduces maintenance and improves safety.
The standardized dimensions and materials allow manufacturing and engineering teams to select fasteners that meet both design and operational requirements, ensuring safe and durable aerospace structures.
Related Standards
EN 3712:2007 references and aligns with several key standards to ensure full compliance and interoperability in aerospace fastener management:
- ISO 3191 - Dimensions for aerospace self-locking, one lug anchor nuts with MJ threads.
- ISO 5855-2 - Defines limit dimensions for bolts and nuts with MJ threads.
- ISO 8788 - Tolerances of form and position for metric aerospace nuts.
- EN 2133 - Requirements for cadmium plating of steels used in aerospace applications.
- EN 2491 - Specifications for molybdenum disulphide dry lubricants, including coating methods.
- EN 2424 - Marking of aerospace products for traceability.
- EN 9100 - Quality management systems requirements for aerospace products manufacturing.
- EN 9133 - Procedure for qualification of aerospace standard parts, ensuring product reliability.
By adhering to these interconnected standards, EN 3712:2007 ensures that aerospace nuts meet rigorous quality, safety, and performance criteria critical for high-stress aerospace environments.
Keywords: EN 3712:2007, aerospace nuts, self-locking anchor nuts, cadmium plated nuts, MoS2 lubricated nuts, aerospace fasteners, high strength nuts, aerospace standards, ISO 3191, EN 2133, aviation nuts, fixed anchor nuts, temperature resistant nuts
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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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