EN 4399:2008

Aerospace series - Rings, threaded, self-locking, in heat resisting steel FE-PA92HT (A286), silver plated

This standard specifies the characteristics of threaded, self-locking rings, in FE-PA2601, silver plated, metric, chiefly used for axial location of bearing outer rings.
Maximum test temperature of the parts: 450 °C.
NOTE   These parts are designed to be used with 4H6H internal threads.

Luft- und Raumfahrt - Gewinderinge, selbstsichernd, aus hochwarmfestem Stahl FE-PA92HT (A286), versilbert

Diese Norm legt die Eigenschaften von selbstsichernden, metrischen Gewinderingen aus FE PA2601, versilbert, fest, die hauptsächlich zur axialen Sicherung von Lageraußenringen verwendet werden.
Maximale Prüftemperatur der Teile: 450 °C.
ANMERKUNG   Diese Teile sind zur Verwendung für Innengewinde mit 4H6H ausgelegt.

Série aérospatiale - Bagues filetées, à freinage interne, en acier résistant à chaud FE-PA92HT (A286), argentées

Aeronavtika - Obročki, navojni, samozapiralni, iz toplotnoodpornega jekla FE-PA92HT (A286), posrebreni

General Information

• Status: Published
• Publication Date: 01-Apr-2008
• Withdrawal Date: 30-Oct-2008
• ICS: 49.030.50 - Washers and other locking elements
• Technical Committee: ASD-STAN - Aerospace
• Drafting Committee: ASD-STAN/D 3 - Mechanical
• Current Stage: 9093 - Decision to confirm - Review Enquiry
• Start Date: 21-Jan-2024
• Completion Date: 14-May-2025
• Ref Project: SIST EN 4399:2008 - Aerospace series - Rings, threaded, self-locking, in heat resisting steel FE-PA92HT (A286), silver plated

Overview

EN 4399:2008 is a CEN aerospace standard that defines the characteristics of threaded, self‑locking rings used primarily for axial location of bearing outer rings. The published title refers to heat‑resisting steel FE‑PA92HT (A286), silver plated, while the Scope and normative references in the document also refer to FE‑PA2601 alloys and related material standards. Key limits and conditions in the standard include a maximum test temperature of 450 °C and compatibility with 4H6H internal threads. Dimensions and tolerances apply after silver plating.

Key topics

• Product scope: Metric, threaded, self‑locking rings intended for aerospace use (axial bearing location).
• Materials: Referenced heat‑resisting steels (title: FE‑PA92HT (A286); document references FE‑PA2601 and related EN material standards).
• Threading: MJ thread forms in accordance with MJ thread requirements (see ISO 5855‑1 referenced) and designed to be used with 4H6H internal threads.
• Surface treatment: Electrolytic silver plating per EN 2786. Minimum 5 μm measured at the thread pitch diameter; 5–15 μm on other surfaces.
• Dimensional data: Configuration, dimensions, tolerances and masses are specified (see Figure 1 and Table 1 in EN 4399); dimensions are given in millimetres and apply after plating.
• Form and locking feature: Details of form not stated and the self‑locking mechanism are largely left to the manufacturer's discretion, though overall geometry and marking requirements are standardized.
• Edge and finish: Notes such as removal of sharp edges (0.1–0.4 mm) are included.
• Designation and marking: Example designation format (e.g., EN4399–040) and marking style A per EN 2424.

Applications

• Aerospace OEMs and suppliers using threaded, self‑locking rings for axial location of bearing outer rings in landing gear, engine accessories and high‑temperature assemblies.
• Components exposed to elevated operating or test temperatures (up to 450 °C).
• Use cases that require silver‑plated, corrosion‑resistant fasteners with high strength heat‑resisting steels.

Who uses this standard

• Fastener and aerospace component manufacturers (design and production).
• Aerospace design engineers specifying bearing retention hardware.
• Quality, procurement and maintenance teams verifying conformity and traceability.
• Certification and regulatory bodies reviewing material/finish and marking compliance.

Related standards

• ISO 5855‑1 (MJ threads)
• EN 2171 (FE‑PA92‑HT material)
• EN 2786 (electrolytic silver plating of fasteners)
• EN 3299 (technical specification for related shaft‑nuts and rings)
• EN 2424 (marking of aerospace products)

Keywords: EN 4399:2008, aerospace standard, threaded self‑locking rings, FE‑PA92HT, A286, FE‑PA2601, silver plated, 450 °C, 4H6H threads, MJ thread.

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Aerospace series - Rings, threaded, self-locking, in heat resisting steel FE-PA92HT (A286), silver platedSérie aérospatiale - Bagues filetées, à freinage interne, en acier résistant à chaud FE-PA92HT (A286), argentéesLuft- und Raumfahrt - Gewinderinge, selbstsichernd, aus hochwarmfestem Stahl FE-PA92HT (A286), versilbert49.030.50Podložke in drugi blokirni elementiWashers and other locking elementsICS:SIST EN 4399:2008enTa slovenski standard je istoveten z:EN 4399:200801-julij-2008SIST EN 4399:2008SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 4399April 2008ICS 49.030.50 English VersionAerospace series - Rings, threaded, self-locking, in heatresisting steel FE-PA92HT (A286), silver platedSérie aérospatiale - Bagues filetées, à freinage interne, enacier résistant à chaud FE-PA92HT (A286), argentéesLuft- und Raumfahrt - Gewinderinge, selbstsichernd, aushochwarmfestem Stahl FE-PA92HT (A286), versilbertThis European Standard was approved by CEN on 26 August 2006.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN 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 translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, 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 and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2008 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 4399:2008: E
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