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

This standard specifies the characteristics of self-locking shaft-nuts, with left-hand threads, in FE PA92HT, silver plated, chiefly used for axial location of bearing inner rings on shafts.
Maximum test temperature of the parts: 450 °C.
NOTE   These parts are designed to be used with 4g6g external threads.

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

Diese Norm legt die Eigenschaften von selbstsichernden Wellenmuttern mit Linksgewinde, aus FE PA92HT, versilbert, fest, die hauptsächlich zur axialen Sicherung von Lagerinnenringen auf Wellen verwendet werden.
Maximale Prüftemperatur der Teile: 450 °C.
ANMERKUNG   Diese Teile sind zur Verwendung für Außengewinde mit 4g6g ausgelegt.

Série aérospatiale - Écrous d'arbre, à freinage interne, filetage à gauche, en acier résistant à chaud FE-PA92HT (A286), argentés

Aeronavtika - Gredne matice, samozapiralne, levi navoj, iz jekla, odpornega proti toploti, FE-PA92HT (A286), posrebrene

General Information

Status
Published
Publication Date
26-May-2008
ICS
49.030.30 - Nuts
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 3728:2008 - Aerospace series - Shaft-nuts, self-locking, left-hand thread, in heat resisting steel FE-PA92HT (A286), silver plated

Overview

EN 3728:2008 is a CEN (Aerospace series) standard that specifies the characteristics of self‑locking shaft‑nuts with left‑hand MJ threads manufactured from heat‑resisting steel FE‑PA92HT (A286) and silver‑plated. These shaft‑nuts are principally intended for the axial location of bearing inner rings on shafts in aerospace applications. The standard defines materials, surface treatment, dimensional requirements (after plating) and marking; parts are qualified for testing up to 450 °C and are designed for use with 4g6g external threads.

Key Topics

  • Material: Heat‑resisting steel FE‑PA92HT (A286) as referenced to EN 2171/EN 4317 family.
  • Thread form: Left‑hand MJ threads in sizes covering the MJ12…MJ40 range (see Table 1 for thread codes and basic dimensions). Conforms to MJ thread general requirements (ISO 5855‑1).
  • Self‑locking feature: Required, but the exact form and implementation are left to the manufacturer’s discretion; the internal envelope diameter after self‑locking is specified.
  • Surface treatment: Electrolytic silver plating per EN 2786. Thickness:
    • External surfaces: 5 µm to 15 µm
    • Thread: minimum 5 µm (measured at pitch diameter)
  • Dimensions & tolerances: Specified in the standard (applies after plating). Threads intended to mate with 4g6g external threads.
  • Maximum test temperature: 450 °C (parts are designed and tested to maintain properties to this temperature).
  • Marking & designation: Marking per EN 2424 (style A); example designation format and identity block given in the standard.

Applications

  • Axial retention of bearing inner rings on rotating shafts in aerospace assemblies.
  • High‑temperature and high‑strength fastener requirements such as turbine housings, engine accessories, and other propulsion or airframe components where left‑hand locking is needed.
  • Replacement and repair parts in maintenance, repair and overhaul (MRO) activities where standardization and traceability are required.

Who uses this standard

  • Aerospace design and mechanical engineers specifying shaft retention hardware.
  • Fastener manufacturers and plating subcontractors producing FE‑PA92HT (A286) shaft‑nuts.
  • Procurement and quality assurance teams validating parts against standard characteristics and marking.
  • MRO organizations, regulatory bodies and certification teams verifying component conformity for aircraft and defense platforms.

Related standards

  • EN 2171 / EN 4317 / EN 4318 - material specifications for FE‑PA92HT / FE‑PA2601 alloys
  • EN 2786 - electrolytic silver plating of fasteners
  • EN 2424 - marking of aerospace products
  • EN 3299 - related shaft‑nut technical specifications
  • ISO 5855‑1 - MJ thread general requirements

EN 3728:2008 ensures consistent, high‑temperature capable, silver‑plated, left‑hand self‑locking shaft‑nuts for aerospace shaft retention applications, facilitating interchangeability, traceability and safety across the supply chain.

Frequently Asked Questions

SIST EN 3728:2008 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Aerospace series - Shaft-nuts, self-locking, left-hand thread, in heat resisting steel FE-PA92HT (A286), silver plated". This standard covers: This standard specifies the characteristics of self-locking shaft-nuts, with left-hand threads, in FE PA92HT, silver plated, chiefly used for axial location of bearing inner rings on shafts. Maximum test temperature of the parts: 450 °C. NOTE These parts are designed to be used with 4g6g external threads.

This standard specifies the characteristics of self-locking shaft-nuts, with left-hand threads, in FE PA92HT, silver plated, chiefly used for axial location of bearing inner rings on shafts. Maximum test temperature of the parts: 450 °C. NOTE These parts are designed to be used with 4g6g external threads.

SIST EN 3728:2008 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 3728:2008 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.

Standards Content (Sample)


2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Aerospace series - Shaft-nuts, self-locking, left-hand thread, in heat resisting steel FE-PA92HT (A286), silver platedAeronavtika - Gredne matice, samozapiralne, levi navoj, iz jekla, odpornega proti toploti, FE-PA92HT (A286), posrebreneSérie aérospatiale - Écrous d'arbre, à freinage interne, filetage à gauche, en acier résistant à chaud FE-PA92HT (A286), argentésLuft- und Raumfahrt - Wellenmuttern, selbstsichernd, Linksgewinde, aus hochwarmfestem Stahl FE-PA92HT (A286), versilbert49.030.30MaticeNutsICS:SIST EN 3728:2008enTa slovenski standard je istoveten z:EN 3728:200801-julij-2008SIST EN 3728:2008SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 3728April 2008ICS 49.030.30 English VersionAerospace series - Shaft-nuts, self-locking, left-hand thread, inheat resisting steel FE-PA92HT (A286), silver platedSérie aérospatiale - Écrous d'arbre, à freinage interne,filetage à gauche, en acier résistant à chaud FE-PA92HT(A286), argentésLuft- und Raumfahrt - Wellenmuttern, 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 3728:2008: E
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