Aerospace series - Nuts, bihexagonal, self-locking, in heat resisting steel FE-PA2601 (A286), silver plated on thread - Classification: 1 100 MPa (at ambient temperature) / 650 °C

This standard specifies the characteristics of self-locking bihexagonal nuts in FE-PA2601, silver plated on thread, for aerospace applications.
Classification: 1 100 MPa  ) / 650 °C  )

Luft- und Raumfahrt - Zwölfkantmuttern, selbstsichernd, aus hochwarmfestem Stahl FE-PA2601 (A286), Gewinde versilbert - Klasse: 1 100 MPa (bei Raumtemperatur) / 650 °C

Diese Norm legt die Eigenschaften von selbstsichernden Zwölfkantmuttern aus FE-PA2601, Gewinde versilbert, für Anwendungen in der Luft- und Raumfahrt fest.
Klasse: 1 100 MPa ) / 650 °C )

Série aérospatiale - Écrous bihexagonaux, a freinage interne, en acier résistant a chaud FE-PA2601 (A286), argentés sur filetage - Classification : 1 100 MPa (a température ambiante ) / 650 °C

Aerospace series - Nuts, bihexagonal, self-locking, in heat resisting steel FE-PA2601 (A286), silver plated on thread - Classification: 1 100 MPa (at ambient temperature) / 650 °C

General Information

Status
Published
Publication Date
31-May-2005
ICS
49.030.30 - Nuts
Technical Committee
SS SPL - Technical Board for the general field
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
01-Jun-2005
Due Date
01-Jun-2005
Completion Date
01-Jun-2005
Ref Project
EN 4118:2004 - Aerospace series - Nuts, bihexagonal, self-locking, in heat resisting steel FE-PA2601 (A286), silver plated on thread - Classification: 1 100 MPa (at ambient temperature) / 650 °C

Relations

Replaces
SIST EN 4118:2004 - Aerospace series - Nuts, bihexagonal, self-locking, in heat resisting steel FE-PA92HT (A286), silver plated on thread - Classification: 1 100 MPa (at ambient temperature) / 650°C
Effective Date
01-Jun-2005

Overview

EN 4118:2004 is a CEN/AECMA aerospace standard that defines the characteristics of self‑locking bihexagonal nuts made from heat‑resisting steel FE‑PA2601 (A286) with silver plating on the threads. It applies to aerospace fasteners requiring high tensile capacity and elevated temperature performance: classification 1 100 MPa (ambient) and maximum test temperature 650 °C. The standard specifies geometry, materials, surface treatment, marking and designation for these nuts used in critical aerospace applications.

Key topics and requirements

  • Material: Heat‑resisting steel FE‑PA2601 (A286) as referenced to EN 2399 or EN 3639 for bar/wire and mechanical properties.
  • Locking type: Bihexagonal, self‑locking (formed out‑of‑round zone to achieve locking).
  • Threads: MJ series threads per ISO 5855‑2; wrenching configuration per ISO 4095. Dimensions and tolerances are given in Table 1 and apply after silver plating.
  • Surface treatment: Electrolytic silver plating on threads and chamfers per EN 2786. Thickness requirements:
    • For thread sizes ≥ MJ6: ≥ 5 µm on thread flanks.
    • For MJ5 and chamfers: complete coverage required (no minimum thickness specified).
  • Mechanical classification: Identified as Class 1 100 MPa - the minimum tensile stress the nut must withstand in a specified test with a higher‑strength bolt. Maximum test temperature for parts is 650 °C.
  • Marking & designation: Marking per EN 2424 (style A). Designation format example: NUT EN4118‑050 (standard number + thread code).
  • Documentation: Technical specification references EN 3004 and normative list includes ISO 4095, ISO 5855‑2, EN 2399, EN 2424, EN 2786, EN 3004, EN 3639.

Applications

EN 4118 nuts are intended for aerospace structural and engine applications where:

  • High temperature resistance and creep performance are required (up to 650 °C testing).
  • Self‑locking retention is necessary to resist vibration and dynamic loads.
  • Silver‑plated threads are used for corrosion resistance and compatibility in aerospace environments.

Typical users:

  • Aerospace fastener manufacturers and suppliers
  • Design and mechanical engineers specifying high‑temperature fasteners
  • Procurement teams and quality assurance for aerospace OEMs and MROs
  • Certification and testing laboratories

Related standards

Relevant referenced standards (normative):

  • ISO 4095, ISO 5855‑2
  • EN 2399, EN 3639 (material specs)
  • EN 2786 (electrolytic silver plating)
  • EN 2424 (marking)
  • EN 3004 (technical specification for similar nuts)

Keywords: EN 4118:2004, bihexagonal nuts, self‑locking nuts, FE‑PA2601, A286, silver plated thread, aerospace fasteners, heat resisting steel, MJ threads, 1100 MPa, 650 °C.

Frequently Asked Questions

SIST EN 4118:2005 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Aerospace series - Nuts, bihexagonal, self-locking, in heat resisting steel FE-PA2601 (A286), silver plated on thread - Classification: 1 100 MPa (at ambient temperature) / 650 °C". This standard covers: This standard specifies the characteristics of self-locking bihexagonal nuts in FE-PA2601, silver plated on thread, for aerospace applications. Classification: 1 100 MPa ) / 650 °C )

This standard specifies the characteristics of self-locking bihexagonal nuts in FE-PA2601, silver plated on thread, for aerospace applications. Classification: 1 100 MPa ) / 650 °C )

SIST EN 4118:2005 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 4118:2005 has the following relationships with other standards: It is inter standard links to SIST EN 4118:2004. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.

You can purchase SIST EN 4118:2005 directly from iTeh Standards. The document is available in PDF format and is delivered instantly after payment. Add the standard to your cart and complete the secure checkout process. iTeh Standards is an authorized distributor of SIST standards.

Standards Content (Sample)


SLOVENSKI STANDARD
01-junij-2005
1DGRPHãþD
SIST EN 4118:2004
Aerospace series - Nuts, bihexagonal, self-locking, in heat resisting steel FE-
PA2601 (A286), silver plated on thread - Classification: 1 100 MPa (at ambient
temperature) / 650 °C
Aerospace series - Nuts, bihexagonal, self-locking, in heat resisting steel FE-PA2601
(A286), silver plated on thread - Classification: 1 100 MPa (at ambient temperature) / 650
°C
Luft- und Raumfahrt - Zwölfkantmuttern, selbstsichernd, aus hochwarmfestem Stahl FE-
PA2601 (A286), Gewinde versilbert - Klasse: 1 100 MPa (bei Raumtemperatur) / 650 °C
Série aérospatiale - Écrous bihexagonaux, a freinage interne, en acier résistant a chaud
FE-PA2601 (A286), argentés sur filetage - Classification : 1 100 MPa (a température
ambiante ) / 650 °C
Ta slovenski standard je istoveten z: EN 4118:2004
ICS:
49.030.30 Matice Nuts
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 4118
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2004
ICS 49.030.30 Supersedes EN 4118:2003
English version
Aerospace series - Nuts, bihexagonal, self-locking, in heat
resisting steel FE-PA2601 (A286), silver plated on thread -
Classification: 1 100 MPa (at ambient temperature) / 650° C
Série aérospatiale - Écrous bihexagonaux, à freinage Luft- und Raumfahrt - Zwölfkantmuttern, selbstsichernd,
interne, en acier résistant à chaud FE-PA2601 (A286), aus hochwarmfestem Stahl FE-PA2601 (A286), Gewinde
argentés sur filetage - Classification : 1 100 MPa (à versilbert - Klasse: 1 100 MPa (bei Raumtemperatur) / 650°
température ambiante ) / 650° C C
This European Standard was approved by CEN on 11 September 2003.

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 Central Secretariat 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 Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,
Slovenia, Spain, Sweden, Switzerland and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2004 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 4118:2004: E
worldwide for CEN national Members.

Contents                                                                         Page

Foreword.3
1 Scope .4
2 Normative references .4
3 Required characteristics.4
4 Designation .6
5 Marking .6
6 Technical specification .6
Foreword
This document (EN 4118:2004) has been prepared by the European Association of Aerospace
Manufacturers - Standardization (AECMA-STAN).
After enquiries and votes carried out in accordance with the rules of this Association, t
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.

Loading comments...