SIST EN 3768:2012
(Main)Aerospace series - Nuts, anchor, self-locking, one lug, fixed, reduced series, with counterbore, in heat resisting steel, MoS2 lubricated - Classification: 1 100 MPa (at ambient temperature)/315 °C
Aerospace series - Nuts, anchor, self-locking, one lug, fixed, reduced series, with counterbore, in heat resisting steel, MoS2 lubricated - Classification: 1 100 MPa (at ambient temperature)/315 °C
This European Standard specifies the characteristics of one lug, reduced series, counterbored fixed anchor nuts, with a self locking feature achieved by forming the upper portion out of round, in heat resisting steel, MoS2 lubricated.
Classification: 1100 MPa )/315 °C
Luft- und Raumfahrt - Annietmuttern, selbstsichernd, einseitiger verkürzter Flansch, mit zylindrischer Aussenkung, aus hochwarmfestem Stahl, MoS2-geschmiert - Klasse: 1 100 MPa (bei Raumtemperatur)/315 °C
Diese Europäische Norm legt die Merkmale von Annietmuttern mit zylindrischer Aussenkung und einseitigem verkürztem Flansch fest, selbstsichernd durch ovale Formgebung des oberen Teils, aus hochwarmfestem Stahl, MoS2-geschmiert.
Klasse: 1 100 MPa /315 °C
Série aérospatiale - Écrous à river, à freinage interne, fixes, simple patte, série réduite, avec chambrage, en acier résistant à chaud, lubrifiés MoS2 - Classification: 1 100 MPa (à température ambiante)/315 °C
Aeronavtika - Zakovne matice, samovarovalne, enostranske, iz jekla, kadmirane, mazane z MoS2 - Klasifikacija: 1100 MPa (pri temperaturi okolice)/315 °C
Ta evropski standard določa značilnosti enostranskih fiksnih zakovnih matic iz skrajšane serije z izvrtino za valjaste vijake in samovarovalno funkcijo, ki jo zagotavlja ovalna oblika zgornjega dela, iz toplotnoodpornega jekla, mazane z MoS2. Razvrstitev: 1 100 MPa1)/315 °C2).
General Information
- Status
- Published
- Publication Date
- 05-Jul-2012
- Technical Committee
- I13 - Imaginarni 13
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 18-Jun-2012
- Due Date
- 23-Aug-2012
- Completion Date
- 06-Jul-2012
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
SIST EN 3768:2012 is a European standard focused on aerospace fasteners, specifically anchor nuts with a self-locking feature. These nuts are designed for high-performance environments and are manufactured from heat resisting steel with MoS₂ (molybdenum disulphide) lubrication. They are characterized by one lug, a reduced series profile, and a counterbore, enabling secure and reliable fastening in demanding aerospace applications. The classification for these nuts is 1100 MPa at ambient temperature and up to 315 °C, making them suitable for high-load, high-temperature aerospace assemblies.
Key Topics
- Self-Locking Mechanism
- Achieved by out-of-round forming on the upper portion of the nut
- Increases vibration resistance and prevents loosening during operation
- High-Performance Materials
- Constructed from heat resisting steel for durability and stability under temperature fluctuations
- Lubricated with MoS₂ to reduce friction and facilitate installation
- Design Features
- One lug (single tab) configuration for fixed, anchor installations
- Counterbored for specific mounting requirements in aerospace structures
- Reduced series dimensions for space-constrained assemblies
- Mechanical Classification
- Rated for a minimum strength of 1100 MPa at ambient temperature
- Can withstand operational temperatures up to 315 °C
Applications
These self-locking, fixed anchor nuts are engineered for use in aerospace manufacturing and maintenance, where secure, durable, and temperature-resistant fasteners are essential. Typical applications include:
- Aircraft Structure Assembly
- Used in mounting critical panels, skins, and subassemblies where vibration and thermal stress are expected
- Engine and Powerplant Installations
- Suitable for components exposed to elevated temperatures and dynamic loads
- Military and Defense Aerospace Projects
- Utilized in harsh operational environments requiring high reliability
- Other High-Performance Engineering
- Any engineering field that requires fixed, self-locking, high-strength fasteners in compact spaces
Related Standards
Adhering to SIST EN 3768:2012 ensures compatibility with other aerospace and fastener standards, streamlining procurement and quality control processes. Key related standards include:
- EN 2398, EN 2399, EN 3638, EN 3639, TR 3791
- Material specifications for heat resisting steel used in aerospace fasteners
- EN 2491
- Methods for applying molybdenum disulphide lubricant coatings
- ISO 3191
- Aerospace nuts with various classifications and dimensional standards
- ISO 5855-2
- Limit dimensions for bolts and nuts with MJ threads
- ISO 5858
- Procurement specification for self-locking nuts with operating temperatures ≤ 425°C
- EN 9100, EN 9133
- Quality management and qualification procedures for aerospace standard parts
- EN 2424
- Marking specifications for aerospace products
Practical Value
Complying with SIST EN 3768:2012 guarantees the mechanical reliability and operational safety of aerospace assemblies. By following this standard, manufacturers, suppliers, and maintenance organizations can:
- Ensure high resistance to loosening from vibration and thermal cycling
- Maintain compatibility with existing systems and global aerospace supply chains
- Facilitate quality control and regulatory compliance
- Support long-term performance and safety in mission-critical aerospace applications
Keywords: aerospace anchor nuts, self-locking nuts, heat resisting steel, MoS2 lubrication, high temperature fasteners, EN 3768, aerospace fastener standards
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Frequently Asked Questions
SIST EN 3768:2012 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Aerospace series - Nuts, anchor, self-locking, one lug, fixed, reduced series, with counterbore, in heat resisting steel, MoS2 lubricated - Classification: 1 100 MPa (at ambient temperature)/315 °C". This standard covers: This European Standard specifies the characteristics of one lug, reduced series, counterbored fixed anchor nuts, with a self locking feature achieved by forming the upper portion out of round, in heat resisting steel, MoS2 lubricated. Classification: 1100 MPa )/315 °C
This European Standard specifies the characteristics of one lug, reduced series, counterbored fixed anchor nuts, with a self locking feature achieved by forming the upper portion out of round, in heat resisting steel, MoS2 lubricated. Classification: 1100 MPa )/315 °C
SIST EN 3768:2012 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.
SIST EN 3768:2012 has the following relationships with other standards: It is inter standard links to SIST EN ISO 14589:2002, SIST EN 9100:2018, SIST EN 9133:2018, SIST EN ISO 15792-1:2008, SIST EN 2398:2008, SIST EN 2491:2011, SIST EN 2399:2008, SIST EN 840-6:2004+A1:2008, SIST EN 2424:2008, SIST EN 3638:2026. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
SIST EN 3768:2012 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-september-2012
Aeronavtika - Zakovne matice, samovarovalne, enostranske, iz jekla, kadmirane,
mazane z MoS2 - Klasifikacija: 1100 MPa (pri temperaturi okolice)/315 °C
Aerospace series - Nuts, anchor, self-locking, one lug, fixed, reduced series, with
counterbore, in heat resisting steel, MoS2 lubricated - Classification: 1 100 MPa (at
ambient temperature)/315 °C
Luft- und Raumfahrt - Annietmuttern, selbstsichernd, einseitiger verkürzter Flansch, mit
zylindrischer Aussenkung, aus hochwarmfestem Stahl, MoS2-geschmiert - Klasse: 1 100
MPa (bei Raumtemperatur)/315 °C
Série aérospatiale - Écrous à river, à freinage interne, fixes, simple patte, série réduite,
avec chambrage, en acier résistant à chaud, lubrifiés MoS2 - Classification: 1 100 MPa
(à température ambiante)/315 °C
Ta slovenski standard je istoveten z: EN 3768:2012
ICS:
49.030.30 Matice Nuts
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD
EN 3768
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2012
ICS 49.030.30
English Version
Aerospace series - Nuts, anchor, self-locking, one lug, fixed,
reduced series, with counterbore, in heat resisting steel, MoS2
lubricated - Classification: 1 100 MPa (at ambient
temperature)/315 °C
Série aérospatiale - Écrous à river, à freinage interne, fixes, Luft- und Raumfahrt - Annietmuttern, selbstsichernd,
simple patte, série réduite, avec chambrage, en acier einseitiger verkürzter Flansch, mit zylindrischer
résistant à chaud, lubrifiés MoS2 - Classification: 1 100 Aussenkung, aus hochwarmfestem Stahl, MoS2-
MPa (à température ambiante)/315 °C geschmiert - Klasse: 1 100 MPa (bei Raumtemperatur)/315
°C
This European Standard was approved by CEN on 23 December 2011.
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, 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
Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2012 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 3768:2012: E
worldwide for CEN national Members.
Contents Page
Foreword .3
1 Scope .4
2 Normative references .4
3 Required characteristics .5
3.1 Configuration — Dimensions — Masses .5
3.2 Materials .5
3.3 Surface treatment .5
4 Designation .7
5 Marking .7
6 Technical specification .7
Foreword
This document (EN 3768:2012) 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 September 2012, and conflicting national standards shall be
withdrawn at the latest by September 2012.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. C
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