SIST EN 3729:2008

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

This standard specifies the characteristics of threaded, self-locking rings, with left-hand threads, in FE PA92HT, silver plated, 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, Linksgewinde, aus hochwarmfestem Stahl FE-PA92HT (A286), versilbert

Diese Norm legt die Eigenschaften von selbstsichernden Gewinderingen mit Linksgewinde, aus FE PA92HT, 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, filetage à gauche, en acier résistant à chaud FE-PA92HT (A286), argentées

Aeronavtika - Obročki z navojem, samozapiralni, levi navoj, iz jekla, odpornega proti toploti, FE-PA92HT (A286), posrebreni

General Information

• Status: Published
• Publication Date: 26-May-2008
• ICS: 49.030.99 - Other fasteners
• Technical Committee: I13 - Imaginarni 13
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 09-May-2008
• Due Date: 14-Jul-2008
• Completion Date: 27-May-2008
• Ref Project: EN 3729:2008 - Aerospace series - Rings, threaded, self-locking, left-hand thread, in heat resisting steel FE-PA92HT (A286), silver plated

Overview

EN 3729:2008 (CEN, ASD-STAN) defines the characteristics and technical requirements for aerospace series threaded, self-locking rings with left-hand threads manufactured from heat-resisting steel FE-PA92HT (A286) and silver-plated. These components are chiefly intended for the axial location of bearing outer rings and are specified for use with 4H6H internal threads. The standard includes configuration, dimensional tolerances, material reference, surface treatment and marking rules.

Key facts:

• Designation example: EN3729-040 (see standard for description and identity block).
• Maximum test temperature of parts: 450 °C.
• Threads: left-hand, MJ thread series conformity; intended mating with 4H6H internal threads.
• Surface finish: electrolytic silver plating per EN 2786 (thickness requirements given in the standard).

Key Topics

• Configuration & Dimensions: Dimensions, tolerances and masses are given in the standard (millimetres) and apply after silver plating. Specific sizes and thread codes are listed in Table 1 of EN 3729:2008.
• Material: Reference to heat-resisting steel FE-PA92HT (A286) with material specification indicated by EN 2171 (see normative references and successor documents).
• Surface treatment: Silver plating performed according to EN 2786 with minimum and range thickness values (e.g., minimum 5 µm at the thread pitch diameter; 5–15 µm on other surfaces as specified).
• Manufacturing details: Removal of sharp edges 0.1–0.4 mm; form and self‑locking feature details are left to the manufacturer’s discretion within the standard’s requirements.
• Marking & Identification: Marking follows EN 2424, style A; technical specifications reference EN 3299 for related fastener details.

Applications

EN 3729:2008 parts are tailored for aerospace and defence applications where secure axial location of bearing outer rings is required under elevated temperatures. Typical practical advantages and use-cases include:

• Axial retention of bearing assemblies in engines, gearboxes and high-temperature subsystems.
• Use where left-hand thread orientation is required to match system design or counteract rotational loosening.
• Replacement and maintenance parts compliant with CEN/ASD-STAN avionics and mechanical fastener families.

Related Standards

Key normative and related documents referenced in EN 3729:2008:

• EN 2171 - Heat resisting steel FE-PA92HT (A286) (material reference).
• EN 2786 - Electrolytic silver plating of fasteners (plating process and thickness requirements).
• EN 3299 - Technical specification for related shaft-nuts and threaded rings series.
• EN 2424 - Marking of aerospace products (marking style A).
• ISO 5855-1 - MJ threads general requirements (threading system conformity).

For procurement, design integration and compliance checks, consult the full EN 3729:2008 text and the referenced standards for dimensional tables, thread codes and detailed manufacturing and inspection requirements.

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Aerospace series - Rings, threaded, self-locking, left-hand thread, in heat resisting steel FE-PA92HT (A286), silver platedSérie aérospatiale - Bagues filetées, à freinage interne, filetage à gauche, en acier résistant à chaud FE-PA92HT (A286), argentéesLuft- und Raumfahrt - Gewinderinge, selbstsichernd, Linksgewinde, aus hochwarmfestem Stahl FE-PA92HT (A286), versilbert49.030.99Drugi vezni elementiOther fastenersICS:SIST EN 3729:2008enTa slovenski standard je istoveten z:EN 3729:200801-julij-2008SIST EN 3729:2008SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 3729April 2008ICS 49.030.99 English VersionAerospace series - Rings, threaded, self-locking, left-handthread, in heat resisting steel FE-PA92HT (A286), silver platedSérie aérospatiale - Bagues filetées, à freinage interne,filetage à gauche, en acier résistant à chaud FE-PA92HT(A286), argentéesLuft- und Raumfahrt - Gewinderinge, selbstsichernd,Linksgewinde, aus hochwarmfestem Stahl FE-PA92HT(A286), versilbertThis European Standard was approved by CEN on 29 February 2008.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 3729:2008: E
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