SIST EN 4269:2023

Aerospace series - Nuts, anchor, self-locking, floating, two lug, reduced series, with counterbore, in steel, cadmium plated, MoS2 lubricated - Classification: 1 110 MPa (at ambient temperature)/235 °C

This document specifies the characteristics of self-locking, floating, two lug anchor nuts, reduced series,
with counterbore, in steel, cadmium plated, MoS 2 lubricated.
Classification: 1 100 MPa1/235 °C2

Luft- und Raumfahrt - Annietmuttern, selbstsichernd, beweglich, beiderseitiger Flansch, mit zylindrischer Aussenkung, aus Stahl, verkadmet, MoS2-geschmiert - Klasse: 1 100 MPa (bei Raumtemperatur)/235 °C

Dieses Dokument legt die Merkmale von selbstsichernden, beweglichen Annietmuttern mit beiderseitigem verkürztem Flansch, mit zylindrischer Aussenkung, aus Stahl, verkadmet, MoS2-geschmiert, fest.
Klasse: 1 100 MPa /235 °C .

Série aérospatiale - Écrous à river, à freinage interne, flottants, double patte, série réduite, avec chambrage, en acier, cadmiés, lubrifiés au MoS2 - Classification : 1 100 MPa (à température ambiante)/235 °C

Le présent document spécifie les caractéristiques des écrous à river, à freinage interne, flottants, double patte, série réduite, avec chambrage, en acier, cadmiés, lubrifiés au MoS2.
Classification : 1 100 MPa /235 °C.

Aeronavtika - Zakovne matice, samovarovalne, premične, dvostranske, skrajšana serija, z izvrtino za valjaste vijake, iz jekla, prevlečene s kadmijem, namazane z MoS2 - Klasifikacija: 1 110 MPa (pri temperaturi okolice)/235 °C

Ta dokument določa lastnosti samozapornih, premičnih, dvostranskih zakovnih matic iz skrajšane serije z izvrtino za valjaste vijake, iz jekla, kadmiranih, mazanih z MoS 2.
Klasifikacija: 1100 Mpa1/235 °C2

General Information

• Status: Published
• Publication Date: 16-Aug-2023
• ICS: 49.030.30 - Nuts
• Technical Committee: I13 - Imaginarni 13
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 19-Jul-2023
• Due Date: 23-Sep-2023
• Completion Date: 17-Aug-2023
• Ref Project: EN 4269:2023 - Aerospace series - Nuts, anchor, self-locking, floating, two lug, reduced series, with counterbore, in steel, cadmium plated, MoS2 lubricated - Classification: 1 100 MPa (at ambient temperature)/235 °C

Overview

EN 4269:2023 defines the required characteristics for aerospace series anchor nuts that are self-locking, floating, two-lug and of a reduced series with a counterbore. The standard covers nuts manufactured in steel, cadmium plated and MoS2 (molybdenum disulphide) lubricated, with a classification of 1 100 MPa (at ambient temperature) / 235 °C. It was prepared under ASD STAN and approved by CEN and is applicable as a harmonised European aerospace product specification.

Key Topics

• Configuration, dimensions and masses: Dimensions and tolerances are referenced to ISO 5855-2 and ISO 7323; values apply after cadmium plating and before MoS2 lubrication. Detailed geometry is provided in the standard figures and Table 1.
• Form and position tolerances: Specified in accordance with ISO 8788.
• Materials and treatments:
  • Materials guidance referenced to TR 3791.
  • Cadmium plating: minimum 5 µm on threads and all surfaces contactable by a 20 mm diameter ball; continuous deposit required on other surfaces (EN 2133).
  • MoS2 dry lubricant: applied per EN 2491 (thickness not specified by EN 4269).
  • Sharp edges to be removed to between 0,1 and 0,4 mm.
• Operational requirements: The nut cap shall remain joined to the nut at maximum operating temperature (test conditions per ISO 5858).
• Marking and designation: Marking requirements follow EN 2424, style N; designation format and optional identity codes are described in the standard.
• Quality and qualification: Manufacturer approval and product qualification follow aerospace quality expectations (e.g., EN 9100 for production approval and EN 9133 for qualification procedures), with production by approved aerospace organisations.

Applications

EN 4269 nuts are specified for aerospace fastening assemblies where floating, self-locking anchor nuts are required for secure attachment under vibration and thermal exposure. Typical practical values and benefits include:

• Secure locking performance with controlled self-locking torque
• Corrosion-resistant surface protection via cadmium plating
• Reduced friction and consistent assembly torque from MoS2 lubrication
• Compatibility with MJ thread systems and aerospace procurement specifications

Use cases include airframe joinery, secondary structure attachment and other assemblies where controlled float and reliable locking are required within the specified temperature class.

Related Standards

• EN 2133 - Cadmium plating of steels
• EN 2491 - MoS2 dry lubricants (coating methods)
• ISO 5855-2 - MJ threads limit dimensions
• ISO 5858 - Self-locking nuts procurement specification
• ISO 8788 - Tolerances of form and position
• TR 3791 - Materials for metal self-locking nuts
• EN 2424, EN 9100, EN 9133 - Marking, quality management and qualification procedures

For implementation, consult EN 4269:2023 for figures, tables and the full list of normative references. The standard provides the technical and procurement framework to ensure consistent, aerospace-grade performance for cadmium-plated, MoS2-lubricated anchor nuts.

Standards Content (Sample)

SLOVENSKI STANDARD
01-september-2023
Aeronavtika - Zakovne matice, samovarovalne, premične, dvostranske, skrajšana
serija, z izvrtino za valjaste vijake, iz jekla, prevlečene s kadmijem, namazane z
MoS2 - Klasifikacija: 1 110 MPa (pri temperaturi okolice)/235 °C
Aerospace series - Nuts, anchor, self-locking, floating, two lug, reduced series, with
counterbore, in steel, cadmium plated, MoS2 lubricated - Classification: 1 110 MPa (at
ambient temperature)/235 °C
Luft- und Raumfahrt - Annietmuttern, selbstsichernd, beweglich, beiderseitiger Flansch,
mit zylindrischer Aussenkung, aus Stahl, verkadmet, MoS2-geschmiert - Klasse: 1 100
MPa (bei Raumtemperatur)/235 °C
Série aérospatiale - Écrous à river, à freinage interne, flottants, double patte, série
réduite, avec chambrage, en acier, cadmiés, lubrifiés au MoS2 - Classification : 1 100
MPa (à température ambiante)/235 °C
Ta slovenski standard je istoveten z: EN 4269:2023
ICS:
49.030.30 Matice Nuts
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 4269
EUROPEAN STANDARD
NORME EUROPÉENNE
July 2023
EUROPÄISCHE NORM
ICS 49.030.30
English Version
Aerospace series - Nuts, anchor, self-locking, floating, two
lug, reduced series, with counterbore, in steel, cadmium
plated, MoS2 lubricated - Classification: 1 110 MPa (at
ambient temperature)/235 °C
Série aérospatiale - Écrous à river, à freinage interne, Luft- und Raumfahrt - Annietmuttern, selbstsichernd,
flottants, double patte, série réduite, avec chambrage, beweglich, beiderseitiger Flansch, mit zylindrischer
en acier, cadmiés, lubrifiés au MoS2 - Classification: 1 Aussenkung, aus Stahl, verkadmet, MoS2-geschmiert -
100 MPa (à température ambiante)/235 °C Klasse: 1 100 MPa (bei Raumtemperatur)/235 °C
This European Standard was approved by CEN on 17 April 2023.

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, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 4269:2023 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Required characteristics . 5
4.1 Configuration — Dimensions — Masses . 5
4.2 Tolerances of form and position . 5
4.3 Materials . 5
4.4 Surface treatments . 5
5 Designation. 8
6 Marking . 8
7 Technical specification . 8
Bibliography . 9

European foreword
This document (EN 4269:2023) 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 document has
received the approval of the National Associations and the Official Services of the member countries of
ASD STAN, 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 January 2024, and conflicting national standards shall
be withdrawn at the latest by January 2024.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyp
...