SIST EN 4119:2005

Aerospace series - Nuts, bihexagonal, self-locking, deep counterbore, 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 with deep counterbore in FE-PA92HT, silver plated on thread, for aerospace applications.
Classification: 1 100 MPa  ) I 650 °C  )

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

Diese Norm legt die Eigenschaften von selbstsichernden Zwölfkantmuttern mit zylindrischer Aussenkung 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, a chambrage profond, 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, deep counterbore, 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 4119:2004 - Aerospace series - Nuts, bihexagonal, self-locking, deep counterbore, in heat resisting steel FE-PA2601 (A286), silver plated on thread - Classification: 1 100 MPa (at ambient temperature) / 650 °C

Relations

• Replaces: SIST EN 4119:2004 - Aerospace series - Nuts, bihexagonal, self-locking, deep counterbored, 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 4119:2004 is a CEN (AECMA) aerospace standard that defines the characteristics of bihexagonal, self‑locking nuts with deep counterbore manufactured from heat‑resisting steel FE‑PA2601 (A286) and silver plated on the thread. It is intended for use in aerospace assemblies where high tensile strength and elevated temperature performance are required. The standard classifies these nuts as 1 100 MPa (ambient) / 650 °C (maximum test temperature).

Key topics and requirements

• Configuration, dimensions and tolerances
  • Dimensions and tolerances are given in millimetres (see Figure/Table in the standard) and apply after silver plating of the thread. Wrenching configuration follows ISO 4095 and MJ thread limits follow ISO 5855‑2.
• Material specification
  • Material is heat‑resisting steel FE‑PA2601 (A286); material sources referenced are EN 2399 or EN 3639 (wires/bars for forged fasteners).
• Surface treatment
  • Electrolytic silver plating on threads and coverage for counterbore/chamfers per EN 2786. Minimum silver thickness requirements are specified for certain thread sizes (e.g., ≥5 µm for thread ≥ MJ6).
• Mechanical classification
  • Classification 1 100 MPa denotes the minimum tensile stress the nut must withstand at ambient temperature. 650 °C is the maximum test temperature for parts.
• Self‑locking form and marking
  • The self‑locking requirement is achieved by controlled out‑of‑round forming in the locking zone; marking follows EN 2424 (style A). Designation format: e.g., NUT EN4119‑050 (with thread code).

Applications and who uses this standard

• Typical applications: high‑temperature aerospace fastenings in engines, hot structures, exhaust systems and other assemblies where corrosion resistance, high strength and elevated temperature stability are required.
• Primary users:
  • Aerospace fastener manufacturers and heat‑treat/platers
  • Design and stress engineers specifying fasteners for high‑temperature environments
  • Quality assurance and procurement teams verifying conformity to material, plating and dimensional requirements
  • Maintenance and repair organizations replacing or inspecting critical fasteners

Related standards

• ISO 4095 - Bihexagonal drives (wrenching configuration)
• ISO 5855‑2 - MJ thread limit dimensions
• EN 2399 / EN 3639 - Heat‑resisting steel (FE‑PA92‑HT / FE‑PA2601) raw material specifications
• EN 2786 - Electrolytic silver plating of fasteners
• EN 2424 - Marking of aerospace products
• EN 3004 - Technical specification for similar self‑locking nuts in FE‑PA2601

EN 4119:2004 is essential when specifying self‑locking bihexagonal nuts, ensuring consistent material, plating and mechanical performance for critical high‑temperature aerospace applications.

Standards Content (Sample)

SLOVENSKI STANDARD
01-junij-2005
1DGRPHãþD
SIST EN 4119:2004
Aerospace series - Nuts, bihexagonal, self-locking, deep counterbore, 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, deep counterbore, 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, mit zylindrischer Aussenkung,
aus hochwarmfestem Stahl FE-PA2601 (A286), Gewinde versilbert - Klasse: 1 100 MPa
(bei Raumtemperatur) / 650 °C
Série aérospatiale - Écrous bihexagonaux, a freinage interne, a chambrage profond, 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 4119:2004
ICS:
49.030.30 Matice Nuts
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 4119
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2004
ICS 49.030.30 Supersedes EN 4119:2003
English version
Aerospace series - Nuts, bihexagonal, self-locking, deep
counterbore, 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, mit
interne, à chambrage profond, en acier résistant à chaud zylindrischer Aussenkung, aus hochwarmfestem Stahl FE-
FE-PA2601 (A286), argentés sur filetage - Classification : 1 PA2601 (A286), Gewinde versilbert - Klasse: 1 100 MPa
100 MPa (à température ambiante ) / 650° C (bei Raumtemperatur) / 650° C
This European Standard was approved by CEN on 11 September 2003.

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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 4119:2004) has been prepared by the European Association of Aerospace
Manufacturers - Standardization (AEC
...