Aerospace series - Nuts, hexagonal, self-locking, in heat resisting steel FE-PA2601 (A286), silver plated on thread - Classification: 1 100 MPa (at ambient temperature) / 425 °C

This standard specifies the characteristics of self-locking hexagonal nuts in FE-PA92HT, silver plated on thread, for aerospace applications.
Classification : 1 100 MPa  ) / 425 °C  )

Luft- und Raumfahrt - Sechskantmuttern, selbstsichernd, aus hochwarmfestem Stahl FE-PA2601 (A286), Gewinde versilbert - Klasse: 1 100 MPa (bei Raumtemperatur) / 425 °C

Diese Norm legt die Eigenschaften von selbstsichernden Sechskantmuttern aus FE-PA2601, Gewinde versilbert, für Anwendungen in der Luft- und Raumfahrt fest.
Klasse: 1 100 MPa ) / 425 °C )

Série aérospatiale - Écrous hexagonaux, a freinage interne, en acier résistant a chaud FE-PA2601 (A286), argentés sur filetage - Classification : 1 100 MPa (a température ambiante ) / 425 °C

Aerospace series - Nuts, hexagonal, self-locking, in heat resisting steel FE-PA2601 (A286), silver plated on thread - Classification: 1 100 MPa (at ambient temperature) / 425 °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 4116:2004 - Aerospace series - Nuts, hexagonal, self-locking, in heat resisting steel FE-PA2601 (A286), silver plated on thread - Classification: 1 100 MPa (at ambient temperature) / 425 °C

Relations

Replaces
SIST EN 4116:2004 - Aerospace series - Nuts, hexagonal, self-locking, in heat resisting steel FE-PA92HT (A286), silver plated on thread - Classification: 1 100MPa (at ambient temperature) / 425°C
Effective Date
01-Jun-2005

Overview

SIST EN 4116:2005 is a European standard specifying the requirements for aerospace-grade self-locking hexagonal nuts made from heat-resistant steel FE-PA2601 (also known as A286). These nuts are silver plated on the thread surface and are classified with a tensile strength of 1,100 MPa at ambient temperature, capable of performing reliably up to 425 °C. Developed by the European Association of Aerospace Manufacturers and approved by CEN, this standard ensures uniformity and high performance for aerospace applications where durability under extreme conditions is critical.

Key Topics

  • Material Specification
    The nuts are manufactured from FE-PA2601 (A286) heat-resisting steel, a nickel-chromium alloy known for excellent mechanical strength and corrosion resistance at elevated temperatures. This ensures structural integrity in demanding aerospace environments.

  • Mechanical Properties and Classification
    The nuts meet a tensile strength classification of 1,100 MPa at ambient temperature and maintain performance at temperatures up to 425 °C. This classification guarantees resistance to breakage and cracking when used with bolts of higher strength class.

  • Dimensional and Design Requirements
    Dimensions, tolerances, and mass of the nuts adhere to ISO 7995 standards for aerospace self-locking hexagonal nuts. The standard stipulates detailed measurements to ensure interchangeability and proper fitment, including thread size, pitch diameter, chamfer specifications, and self-locking feature (achieved through slight out-of-round formation).

  • Surface Treatment
    Threads and chamfers receive electrolytic silver plating in compliance with EN 2786. Silver plating thickness is at least 5 µm on thread flanks for thread sizes ≥ MJ6, while smaller threads require complete coverage without a minimum thickness. This plating enhances corrosion resistance and contributes to reliable locking under aerospace service conditions.

  • Marking and Traceability
    Marking of nuts follows EN 2424 for aerospace products, ensuring clear identification, traceability, and compliance for manufacturers and end-users.

Applications

SIST EN 4116:2005 nuts are primarily designed for aerospace fasteners where the combination of high strength, high temperature resistance, and secure locking is essential. Typical applications include:

  • Aircraft structural assemblies
  • Engine components subjected to high heat
  • Aerospace mechanical systems requiring vibration-resistant fasteners
  • High-performance aerospace threaded joints demanding longevity and reliability

These nuts provide engineers and manufacturers with confidence for critical aerospace fastening needs, supporting safety, performance, and maintenance efficiency.

Related Standards

  • ISO 7995 – Dimensions and classifications for aerospace hexagonal self-locking nuts with MJ threads
  • EN 2786 – Electrolytic silver plating specifications for aerospace fasteners
  • EN 3152 – Technical specification for self-locking nuts in FE-PA2601 steel with MJ threads
  • EN 2424 – Marking of aerospace products for identification and traceability
  • EN 2399 – Specifications for heat-resisting steel FE-PA92-HT bars used in forged bolts
  • EN 3638 / EN 3639 – Processing and material condition standards for FE-PA2601 alloy used in fasteners

By complying with SIST EN 4116:2005, aerospace manufacturers ensure the production of reliable, heat resistant, self-locking nuts characterized by precise dimensions, robust material choice, and high-quality surface treatment. This standard facilitates safety and quality assurance essential for modern aerospace engineering and manufacturing.

Frequently Asked Questions

SIST EN 4116:2005 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Aerospace series - Nuts, hexagonal, self-locking, in heat resisting steel FE-PA2601 (A286), silver plated on thread - Classification: 1 100 MPa (at ambient temperature) / 425 °C". This standard covers: This standard specifies the characteristics of self-locking hexagonal nuts in FE-PA92HT, silver plated on thread, for aerospace applications. Classification : 1 100 MPa ) / 425 °C )

This standard specifies the characteristics of self-locking hexagonal nuts in FE-PA92HT, silver plated on thread, for aerospace applications. Classification : 1 100 MPa ) / 425 °C )

SIST EN 4116:2005 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 4116:2005 has the following relationships with other standards: It is inter standard links to SIST EN 4116:2004. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.

You can purchase SIST EN 4116:2005 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 4116:2004
Aerospace series - Nuts, hexagonal, self-locking, in heat resisting steel FE-PA2601
(A286), silver plated on thread - Classification: 1 100 MPa (at ambient
temperature) / 425 °C
Aerospace series - Nuts, hexagonal, self-locking, in heat resisting steel FE-PA2601
(A286), silver plated on thread - Classification: 1 100 MPa (at ambient temperature) / 425
°C
Luft- und Raumfahrt - Sechskantmuttern, selbstsichernd, aus hochwarmfestem Stahl FE-
PA2601 (A286), Gewinde versilbert - Klasse: 1 100 MPa (bei Raumtemperatur) / 425 °C
Série aérospatiale - Écrous hexagonaux, a freinage interne, en acier résistant a chaud
FE-PA2601 (A286), argentés sur filetage - Classification : 1 100 MPa (a température
ambiante ) / 425 °C
Ta slovenski standard je istoveten z: EN 4116:2004
ICS:
49.030.30 Matice Nuts
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 4116
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2004
ICS 49.030.30 Supersedes EN 4116:2003
English version
Aerospace series - Nuts, hexagonal, self-locking, in heat
resisting steel FE-PA2601 (A286), silver plated on thread -
Classification: 1 100 MPa (at ambient temperature) / 425° C
Série aérospatiale - Écrous hexagonaux, à freinage interne, Luft- und Raumfahrt - Sechskantmuttern, selbstsichernd,
en acier résistant à chaud FE-PA2601 (A286), argentés sur aus hochwarmfestem Stahl FE-PA2601 (A286), Gewinde
filetage - Classification : 1 100 MPa (à température versilbert - Klasse: 1 100 MPa (bei Raumtemperatur) / 425°
ambiante ) / 425° 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 4116:2004: 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 4116:2004) 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, this Standard has
received the approval of the National Associations and the Official Services of the member countries of
AECMA, 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 May 2005, and conflicting national standards sha
...

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