EN 4084:2009
(Main)Aerospace series - Nuts, anchor, self-locking, fixed, two lug, with counterbore, in alloy steel, cadmium plated, MoS2 lubricated - Classification: 1 100 MPA (at ambient temperature) / 235 °C
Aerospace series - Nuts, anchor, self-locking, fixed, two lug, with counterbore, in alloy steel, cadmium plated, MoS2 lubricated - Classification: 1 100 MPA (at ambient temperature) / 235 °C
This European Standard specifies the characteristics of two lug fixed anchor nuts, with counterbore and a self-locking feature achieved by forming the upper portion out-of-round, in alloy steel, cadmium plated, MoS2 lubricated.
Classification: 1 100 MPa / 235 °C.
Luft- und Raumfahrt - Annietmuttern, selbstsichernd, beiderseitiger Flansch mit zylindrischer Aussenkung aus legiertem Stahl, verkadmet, MoS2-geschmiert - Klasse: 1 100 MPa (bei Raumtemperatur) / 235 °C
Diese Norm legt die Eigenschaften von unbeweglichen Annietmuttern mit beiderseitigem Flansch mit zylindrischer Aussenkung und einer durch Verformung des oberen Teils erzielten Selbstsicherung, aus legiertem Stahl, verkadmet, MoS2 geschmiert fest.
Klasse: 1 100 MPa/235 °C
Série aérospatiale - Écrous à river, à freinage interne, fixes, double patte, avec chambrage, en acier, cadmiés, lubrifiés MoS2 - Classification: 1 100 MPa (à température ambiente)/235 °C
Aeronavtika - Zakovne matice, samovarovalne, fiksne, dvostranske, z izvrtino za valjaste vijake, iz legiranega jekla, kadmirane, mazane z MoS2 - Klasifikacija: 1100 MPa (pri temperaturi okolice)/235 °C
Ta evropski standard določa značilnosti dvostranskih fiksnih zakovnih matic, z izvrtino za vijake in s samozapiralno funkcijo, ki je dosežena tako, da je zgornji del oblikovan rahlo ovalno, iz legiranega jekla, kadmiranih, in mazanih z MoS2. Klasifikacija: 1.100 MPa 1) / 235°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 4084:2009 is a CEN aerospace standard that specifies the characteristics of anchor nuts (two-lug, fixed, self-locking) made from alloy steel, cadmium plated and MoS2 (molybdenum disulfide) lubricated. The standard covers dimensional, material and surface-treatment requirements and gives a classification of 1100 MPa (at ambient temperature) with a maximum service temperature of 235 °C (surface-treatment dependent). EN 4084 is intended for aerospace applications where reliable prevailing-torque locking and durability are required.
Key topics
- Component type: Two-lug (two lug) fixed anchor nut with counterbore and an out-of-round upper portion to provide the self‑locking feature.
- Materials: Alloy steels referenced via EN 2542 / EN 2543 or ASD-STAN TR 3791 as applicable.
- Surface treatment: Cadmium plating per EN 2133 with a minimum deposit of 5 µm on threads and contactable surfaces; MoS2 lubrication applied per EN 2491 (thickness not specified).
- Dimensions & tolerances: Conform to ISO 3223 (dimensions) and ISO 8788 (form and position tolerances); specific sizes and mass data are given in the standard tables.
- Classification meaning: 1100 MPa corresponds to the strength class of the mating bolt the nut can withstand at ambient temperature; 235 °C is the maximum temperature above which the nut may change characteristics (limited by surface treatment).
- Identification & marking: Designation format examples (e.g., EN4084-060) and marking requirements follow EN 2424 (style N).
- Quality & approval: Manufacturer approval and product qualification reference EN 9100 and EN 9133 respectively.
Applications
- Structural and non-structural aerospace bolted joints requiring prevailing‑torque self‑locking nuts, such as access panels, secondary structure, and attachment points.
- Situations where high-strength fasteners with controlled surface treatment (cadmium/MoS2) are specified for corrosion protection and consistent installation torque behavior.
- Use in assemblies where compatibility with mating bolts of 1100 MPa class is required and where service temperatures do not exceed 235 °C.
Who should use EN 4084:2009
- Aerospace fastener manufacturers and suppliers
- Design and stress engineers specifying fasteners for aircraft and spacecraft
- Procurement teams writing purchase specifications for standard parts
- Quality, inspection and certification personnel verifying conformity to aerospace standards
Related standards
- ISO 3223 (dimensions for comparable anchor nuts)
- EN 2133 (cadmium plating)
- EN 2491 (MoS2 dry lubricants)
- EN 2542 / EN 2543, TR 3791 (material guidance)
- EN 2424 (marking), EN 9100 and EN 9133 (quality/qualification)
Using EN 4084 helps ensure interoperable, high‑strength, self‑locking anchor nuts meet consistent aerospace requirements for performance, marking and traceability.
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Frequently Asked Questions
EN 4084:2009 is a standard published by the European Committee for Standardization (CEN). Its full title is "Aerospace series - Nuts, anchor, self-locking, fixed, two lug, with counterbore, in alloy steel, cadmium plated, MoS2 lubricated - Classification: 1 100 MPA (at ambient temperature) / 235 °C". This standard covers: This European Standard specifies the characteristics of two lug fixed anchor nuts, with counterbore and a self-locking feature achieved by forming the upper portion out-of-round, in alloy steel, cadmium plated, MoS2 lubricated. Classification: 1 100 MPa / 235 °C.
This European Standard specifies the characteristics of two lug fixed anchor nuts, with counterbore and a self-locking feature achieved by forming the upper portion out-of-round, in alloy steel, cadmium plated, MoS2 lubricated. Classification: 1 100 MPa / 235 °C.
EN 4084:2009 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 4084:2009 has the following relationships with other standards: It is inter standard links to EN 12203:2003/AC:2006, EN 9133:2018, EN 2491:2011. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
EN 4084:2009 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)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Aeronavtika - Zakovne matice, samovarovalne, fiksne, dvostranske, z izvrtino za valjaste vijake, iz legiranega jekla, kadmirane, mazane z MoS2 - Klasifikacija: 1100 MPa (pri temperaturi okolice)/235 °CLuft- und Raumfahrt - Annietmuttern, selbstsichernd, beiderseitiger Flansch mit zylindrischer Aussenkung aus legiertem Stahl, verkadmet, MoS2-geschmiert - Klasse: 1100 MPa (bei Raumtemperatur) / 235 °CSérie aérospatiale - Écrous à river, à freinage interne, fixes, double patte, avec chambrage, en acier allié, cadmiés, lubrifiés MoS2 - Classification: 1100 MPa (à température ambiente)/235 °CAerospace series - Nuts, anchor, self-locking, fixed, two lug, with counterbore, in alloy steel, cadmium plated, MoS2 lubricated - Classification: 1100 MPA (at ambient temperature)/235 °C49.030.30MaticeNutsICS:Ta slovenski standard je istoveten z:EN 4084:2009SIST EN 4084:2010en01-januar-2010SIST EN 4084:2010SLOVENSKI
STANDARD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 4084
November 2009 ICS 49.030.30 English Version
Aerospace series - Nuts, anchor, self-locking, fixed, two lug, with counterbore, in alloy steel, cadmium plated, MoS2 lubricated - Classification: 1 100 MPA (at ambient temperature) / 235 °C
Série aérospatiale - Écrous à river, à freinage interne, fixes, double patte, avec chambrage, en acier, cadmiés, lubrifiés MoS2 - Classification: 1 100 MPa (à température ambiente)/235 °C
Luft- und Raumfahrt - Annietmuttern, selbstsichernd, beiderseitiger Flansch mit zylindrischer Aussenkung aus legiertem Stahl, verkadmet, MoS2-geschmiert - Klasse: 1 100 MPa (bei Raumtemperatur) / 235 °C This European Standard was approved by CEN on 15 September 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 worldwide for CEN national Members. Ref. No. EN 4084:2009: ESIST EN 4084:2010
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