Aerospace series - Nuts, elliptical clinch, self-locking, MJ threads, in heat resisting steel FE-PA2601 (A286), MoS2 coated, Classification: 900 MPa (at ambient temperature)/ 425 °C

This European Standard specifies characteristics of self-locking elliptical clinch nuts with MJ threads in FE-PA2601, MoS2 coated, for aerospace applications.
Classification: 900 MPa  ) / 425 °C  )

Luft- und Raumfahrt - Einnietmutter, blind, elliptischer Kopf, selbstsichernd, MJ-Gewinde, aus hochwarmfestem Stahl FE-PA2601 (A286), MoS2 beschichtet, Klasse: 900 MPa (bei Raumtemperatur)/ 425 °C

Diese Europäische Norm legt die Merkmale von selbstsichernden blinden Einnietmuttern mit elliptischem Kopf und MJ-Gewinde aus FE-PA2601, MoS2-beschichtet, zur Anwendung in der Luft- und Raumfahrt fest.
Klasse: 900 MPa   / 425 °C

Série aérospatiale - Écrous à tête elliptique, à freinage interne, filetage MJ, an acier résistant à chaud FE-PA2601 (A286), revêtus MoS2, Classification: 900 MPa (à température ambiante)/ 425 °C

La présente Norme Européenne spécifie les caractéristiques des écrous à tête elliptique, à freinage interne, filetage MJ, FE-PA2601, revêtus MoS2, pour les applications aérospatiales.
Classification : 900 MPa  ) / 425 °C  )

Aeronavtika - Matice z eliptičnim objemom, samoblokirne, MJ-navoji, iz jekla FE-PA2601 (A286), odpornega proti vročini, prevlečenega z MoS2, klasifikacija: 900 MPa (pri temperaturi okolja)/425 °C

Ta evropski standard določa lastnosti samoblokirnih matic z eliptičnim objemom z MJ-navoji iz jekla FEPA2601, prevlečenega z MoS2 za uporabo v aeronavtiki. Razvrstitev: 900 MPa 1)/425 °C.

General Information

Status
Published
Publication Date
27-Mar-2012
ICS
49.030.30 - Nuts
Technical Committee
I13 - Imaginarni 13
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
23-Mar-2012
Due Date
28-May-2012
Completion Date
28-Mar-2012
Ref Project
EN 4443:2012 - Aerospace series - Nuts, elliptical clinch, self-locking, MJ threads, in heat resisting steel FE-PA2601 (A286), MoS2 coated, Classification: 900 MPa (at ambient temperature)/ 425 °C

Overview

SIST EN 4443:2012 is a European Standard established by CEN that specifies the requirements for self-locking elliptical clinch nuts with MJ threads designed for aerospace applications. These nuts are manufactured from heat-resisting steel FE-PA2601 (also known as A286) and feature a molybdenum disulphide (MoS2) coating to enhance their surface properties. The standard classifies these nuts with a tensile strength of 900 MPa at ambient temperature and suitability for use at temperatures up to 425 °C.

This specification is essential for aerospace manufacturers and engineers who require high-performance, reliable fastening solutions capable of withstanding high mechanical loads and elevated temperatures in demanding environments.

Key Topics

  • Material Specifications:
    The nuts are made of heat-resistant alloy steel FE-PA2601 conforming to EN 2399 and EN 3639 standards. This material ensures high tensile strength, durability, and resistance to heat up to 425 °C.

  • Thread Type and Design:
    The nuts utilize MJ threads per ISO 5855-2, which are specially designed American National Aerospace fastener threads known for high fatigue strength and secure fit. The elliptical clinch design contributes to self-locking properties.

  • Surface Treatment:
    The MoS2 (molybdenum disulphide) dry lubricant coating reduces friction during installation and enhances corrosion and wear resistance, complying with EN 2491 coating methods.

  • Dimensions and Tolerances:
    Detailed dimensional specifications including grip lengths, thread codes, diameters, masses, and tolerances are provided. These precise measurements accommodate the tight tolerances required in aerospace assembly.

  • Classification and Performance:
    Nut classification emphasizes their minimum tensile capacity of 900 MPa and performance integrity up to 425 °C, making these fasteners suitable for heat-intensive aerospace environments.

  • Marking and Traceability:
    Marking requirements ensure traceability in accordance with EN 2424 aerospace series standards, supporting quality control and compliance verification.

Applications

SIST EN 4443:2012 elliptical clinch nuts are primarily applied in the aerospace industry where high strength, self-locking fasteners are critical. Typical uses include:

  • Aircraft Assembly:
    Secure attachment of components that demand reliable fastening under high mechanical stress and elevated temperatures-such as engine parts, airframe structures, and control surfaces.

  • Defense and Spacecraft:
    Fastening solutions for defense equipment and spacecraft where weight, thermal resistance, and mechanical integrity are vital.

  • High-Temperature Environments:
    Situations where standard nuts cannot maintain performance due to temperature exposure, EN 4443 nuts provide enhanced durability and safety.

Their combination of heat resistance, mechanical strength, self-locking elliptical design, and MoS2 surface treatment make them ideal components in critical aerospace fastener applications.

Related Standards

  • EN 2399: Heat resisting steel FE-PA2601 bars for forged bolts with a minimum tensile strength of 900 MPa.
  • EN 3639: Specifications for soft and cold worked FE-PA2601 alloy used in forged fasteners.
  • EN 2491: Methods for MoS2 dry lubricant coatings applicable to aerospace fasteners.
  • EN 4444: Technical specifications complementing EN 4443 for elliptical clinch nuts in the same material and coating class.
  • EN 2424: Aerospace marking standard governing product identification and traceability.
  • ISO 5855-2: Defines the limits and dimensions for MJ threads used in aerospace bolts and nuts.

These interconnected standards ensure consistent quality, performance, and compatibility across aerospace fastening systems.

Keywords: EN 4443, aerospace nuts, elliptical clinch nuts, self-locking nuts, MJ threads, heat resisting steel, FE-PA2601, A286 steel, MoS2 coating, aerospace fasteners, 900 MPa nuts, high temperature nuts, aerospace standards, CEN aerospace standards

Frequently Asked Questions

SIST EN 4443:2012 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Aerospace series - Nuts, elliptical clinch, self-locking, MJ threads, in heat resisting steel FE-PA2601 (A286), MoS2 coated, Classification: 900 MPa (at ambient temperature)/ 425 °C". This standard covers: This European Standard specifies characteristics of self-locking elliptical clinch nuts with MJ threads in FE-PA2601, MoS2 coated, for aerospace applications. Classification: 900 MPa ) / 425 °C )

This European Standard specifies characteristics of self-locking elliptical clinch nuts with MJ threads in FE-PA2601, MoS2 coated, for aerospace applications. Classification: 900 MPa ) / 425 °C )

SIST EN 4443:2012 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 4443:2012 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)


2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Luft- und Raumfahrt - Einnietmutter, blind, elliptischer Kopf, selbstsichernd, MJ-Gewinde, aus hochwarmfestem Stahl FE-PA2601 (A286), MoS2 beschichtet, Klasse: 900 MPa (bei Raumtemperatur)/ 425 °CSérie aérospatiale - Écrous à tête elliptique, à freinage interne, filetage MJ, an acier résistant à chaud FE-PA2601 (A286), revêtus MoS2, Classification: 900 MPa (à température ambiante)/ 425 °CAerospace series - Nuts, elliptical clinch, self-locking, MJ threads, in heat resisting steel FE-PA2601 (A286), MoS2 coated, Classification: 900 MPa (at ambient temperature)/ 425 °C49.030.30MaticeNutsICS:Ta slovenski standard je istoveten z:EN 4443:2012SIST EN 4443:2012en01-maj-2012SIST EN 4443:2012SLOVENSKI
STANDARD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 4443
March 2012 ICS 49.030.30 English Version
Aerospace series - Nuts, elliptical clinch, self-locking, MJ threads, in heat resisting steel FE-PA2601 (A286), MoS2 coated, Classification: 900 MPa (at ambient temperature)/ 425 °C
Série aérospatiale - Écrous à tête elliptique, à freinage interne, filetage MJ, an acier résistant à chaud FE-PA2601 (A286), revêtus MoS2, Classification: 900 MPa (à température ambiante)/ 425 °C
Luft- und Raumfahrt - Einnietmutter, blind, elliptischer Kopf, selbstsichernd, MJ-Gewinde, aus hochwarmfestem Stahl FE-PA2601 (A286), MoS2 beschichtet, Klasse: 900 MPa (bei Raumtemperatur)/ 425 °C This European Standard was approved by CEN on 24 September 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 worldwide for CEN national Members. Ref. No. EN 4443:2012: ESIST EN 4443:2012
...

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