EN 3757:2009
(Main)Aerospace series - Nuts, anchor, self-locking, floating, self-aligning, two lugs, in heat resisting steel, MoS2 lubricated - Classification: 900 MPa (at ambient temperature) / 315 °C
Aerospace series - Nuts, anchor, self-locking, floating, self-aligning, two lugs, in heat resisting steel, MoS2 lubricated - Classification: 900 MPa (at ambient temperature) / 315 °C
This European Standard specifies the characteristics of self-locking, floating, self-aligning, two lugs anchor nuts, in heat resisting steel, MoS2-lubricated.
Classification: 900 MPa / 315 °C.
Luft- und Raumfahrt - Annietmuttern, selbstsichernd, schwenkbar, beiderseitiger Flansch, aus hochwarmfestem Stahl, MoS2-geschmiert - Klasse: 900 MPa (bei Raumtemperatur) / 315 °C
Diese Norm legt die Eigenschaften von selbstsichernden, schwenkbaren Annietmuttern mit beiderseitigem Flansch aus hochwarmfestem Stahl, MoS2 geschmiert, fest.
Klasse: 900 MPa/315°C
Série aérospatiale - Écrous à river, à freinage interne, flottants, orientables, double patte, acier résistant à chaud, lubrifiés MoS2 - Classification : 900 MPa (à température ambiante) / 315 °C
Aeronavtika - Zakovne matice, samozapiralne, premične, samovarovalne, dvostranske, iz toplotnoodpornega jekla, mazane z MoS2 - Klasifikacija: 900 MPa (pri temperaturi okolice)/315 °C
Ta evropski standard opredeljuje značilnosti samozapiralnih, premičnih, samovarovalnih, dvostranskih zakovnih matic iz toplotnoodpornega jekla, mazanih z MoS2. Klasifikacija: 900 MPa 1) / 315°C.
General Information
- Status
- Published
- Publication Date
- 10-Nov-2009
- Withdrawal Date
- 30-May-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
- 21-Jan-2026
Relations
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
Overview
EN 3757:2009 is a CEN aerospace standard that specifies the characteristics of anchor nuts: self-locking, floating, self-aligning, two-lug nuts manufactured in heat-resisting steel and MoS2 (molybdenum disulphide) lubricated. The parts are classified 900 MPa (ambient tensile strength) / 315 °C (maximum service temperature). This standard is intended for aerospace applications where high strength, thermal resistance and reliable self-locking performance are required.
Key Topics and Requirements
- Scope and classification: Defines the nut type (anchor, two-lug, self-locking, floating, self-aligning) and performance class 900 MPa / 315 °C.
- Dimensions and tolerances: Dimensions conform to ISO 12273 and tolerances of form/position to ISO 8788; values apply before MoS2 lubrication.
- Materials: Material selection guidance references TR 3791 (materials for self-locking nuts and inserts for temperature classes ≤ 425 °C).
- Surface treatment and lubrication: Threads must be surface-treated per EN 2491; MoS2 dry lubricant coating methods referenced. Surface treatment influences the maximum usable temperature.
- Forming and manufacturing: Allows specific out-of-round forming in the self-locking zone to achieve required locking torque; removes sharp edges to specified radii.
- Marking and designation: Marking style follows EN 2424; designation format and identity blocks are defined for procurement and traceability.
- Quality and approval: Manufacturer approval and product qualification align with aerospace quality system standards (EN 9100, EN 9133) and procurement requirements (ISO 5858/5855 series).
Applications
- Aerospace structural and assembly hardware where high-temperature resistance and secure locking are critical (airframe panels, engine mounts, high-temperature zones).
- Situations requiring floating/self-aligning nuts to accommodate misalignment during assembly while maintaining locking torque.
- Replacement parts and specification-controlled procurement for aerospace suppliers and OEMs specifying EN 3757 anchor nuts.
Who should use this standard
- Aerospace OEMs, suppliers, and fastener manufacturers specifying or producing self-locking anchor nuts.
- Design, procurement, and quality engineers responsible for mechanical fastening systems in aviation, space, and defense.
- Maintenance and repair organizations selecting certified parts to meet traceability and temperature-class requirements.
Related Standards
Relevant referenced standards include:
- EN 2424 (marking of aerospace products)
- EN 2491 (MoS2 dry lubricants - coating methods)
- EN 9100, EN 9133 (quality systems / product qualification)
- ISO 5855-2, ISO 5858, ISO 8788, ISO 12273
- TR 3791 (materials for self-locking nuts)
Keywords: EN 3757:2009, anchor nuts, self-locking, floating, self-aligning, MoS2 lubricated, heat resisting steel, 900 MPa, 315 °C, aerospace nuts.
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Frequently Asked Questions
EN 3757:2009 is a standard published by the European Committee for Standardization (CEN). Its full title is "Aerospace series - Nuts, anchor, self-locking, floating, self-aligning, two lugs, in heat resisting steel, MoS2 lubricated - Classification: 900 MPa (at ambient temperature) / 315 °C". This standard covers: This European Standard specifies the characteristics of self-locking, floating, self-aligning, two lugs anchor nuts, in heat resisting steel, MoS2-lubricated. Classification: 900 MPa / 315 °C.
This European Standard specifies the characteristics of self-locking, floating, self-aligning, two lugs anchor nuts, in heat resisting steel, MoS2-lubricated. Classification: 900 MPa / 315 °C.
EN 3757:2009 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 3757:2009 has the following relationships with other standards: It is inter standard links to EN 9133:2018, EN 2491:2011, EN 54-20:2006. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
EN 3757:2009 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)
SLOVENSKI STANDARD
01-januar-2010
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Aerospace series - Nuts, anchor, self-locking, floating, self-aligning, two lug, in heat
resisting steel, MoS2 lubricated - Classification: 900 MPa (at ambient temperature)/315 °
C
Luft- und Raumfahrt - Annietmuttern, selbstsichernd, schwenkbar, beiderseitiger
Flansch, aus hochwarmfestem Stahl, MoS2-geschmiert - Klasse: 900 MPa (bei
Raumtemperatur)/315 °C
Série aérospatiale - Écrous à river, à freinage interne, flottants, orientables, double patte,
acier résistant à chaud, lubrifiés MoS2 - Classification: 900 MPa (à température
ambiante)/315 °C
Ta slovenski standard je istoveten z: EN 3757:2009
ICS:
49.030.30 Matice Nuts
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD
EN 3757
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2009
ICS 49.030.30
English Version
Aerospace series - Nuts, anchor, self-locking, floating, self-
aligning, two lugs, in heat resisting steel, MoS2 lubricated -
Classification: 900 MPa (at ambient temperature) / 315 °C
Série aérospatiale - Écrous à river, à freinage interne, Luft- und Raumfahrt - Annietmuttern, selbstsichernd,
flottants, orientables, double patte, acier résistant à chaud, schwenkbar, beiderseitiger Flansch, aus hochwarmfestem
lubrifiés MoS2 - Classification : 900 MPa (à température Stahl, MoS2-geschmiert - Klasse: 900 MPa (bei
ambiante) / 315 °C Raumtemperatur) / 315 °C
This European Standard was approved by CEN on 17 October 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 Ref. No. EN 3757:2009: E
worldwide for CEN national Members.
Contents Page
Foreword .3
1 Scope .4
2 Normative references .4
3 Required characteristics .5
4 Designation .7
5 Marking .7
6 Technical specification .7
Foreword
This document (EN 3757:2009) has been prepared by the Aerospace and Defence Industries Association of
Europe - Standardization (ASD-STAN).
After enquiries and votes carried out in accordance with the rules of this Association, this Standard has
received the approval of the National Associations and the Official Services of the member countries of ASD,
prior to its presentation to CEN.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by May 2010, and conflicting national standards shall be withdrawn at the
latest by May 2010.
Attention is drawn to the possibility
...
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