SIST EN 3427:2009

Aerospace series - Groove dimensions for radial mounting retaining rings

This standard defines the definitions of groove for radial mounting retaining rings.

Luft-und Raumfahrt - Nuten für axial auf Wellen montierbare Sicherungsringe Maße

Diese Norm legt die Maße von Nuten für axial in Bohrungen montierbare Sicherungsringe fest.

Série aérospatiale - Dimensions des gorges pour anneaux d'arrêt à montage radial

Aeronavtika - Mere zarez za varovalne obroče z radialno namestitvijo

General Information

• Status: Published
• Publication Date: 25-Jun-2009
• ICS: 49.030.99 - Other fasteners
• Technical Committee: I13 - Imaginarni 13
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 29-May-2009
• Due Date: 03-Aug-2009
• Completion Date: 26-Jun-2009
• Ref Project: EN 3427:2006 - Aerospace series - Groove dimensions for radial mounting retaining rings

Overview

The SIST EN 3427:2009 standard, issued by the European Committee for Standardization (CEN), specifies the groove dimensions for radial mounting retaining rings used in aerospace applications. Developed by the European Association of Aerospace Manufacturers (AECMA-STAN), this standard provides precise definitions and requirements for groove geometries critical to the secure fitting and reliable performance of retaining rings on shafts or housings.

Radial mounting retaining rings are essential fastening components that prevent axial movement in mechanical assemblies. SIST EN 3427:2009 ensures compatibility, interchangeability, and safety by standardizing groove dimensions, including configurations, tolerances, and nominal sizes.

Key Topics

• Scope and Application
  SIST EN 3427:2009 strictly defines the groove features required for the proper seating of radial mounting retaining rings. This includes groove depth, width, and edge characteristics critical for maintaining secure retention in aerospace hardware.

• Groove Configuration and Characteristics
  The standard mandates a square and sharp edge on the bearing side of the groove to ensure secure ring engagement. Detailed dimensions and tolerances are provided for a range of nominal groove sizes coded from 008 to 300.

• Dimensional Specifications
  A comprehensive table lists dimensions in millimeters for each groove size, specifying:

  • Groove width (D1)
  • Groove diameter limits (D2a)
  • Radial clearance (N)
  • Radius of groove edges (R)
    Manufacturers have some flexibility in tolerances but must adhere to minimum and maximum limits to guarantee fit and function.

• Designation System
  Part numbers and references to complying grooves utilize a clear code system, for example:

  • EN3427-023 refers to the retention groove dimension standard number followed by the diameter code per Table 1.

Applications

SIST EN 3427:2009 plays a crucial role in the aerospace sector, governing the design and manufacture of retaining rings used in:

• Aircraft engine assemblies
• Landing gear mechanisms
• Control system shafts and linkages
• Aerospace fastener subcomponents requiring radial retention

By standardizing groove dimensions, the EN 3427 standard contributes to:

• Enhanced reliability and safety of aircraft components under dynamic loads
• Interchangeability between suppliers and manufacturers within European aerospace markets
• Simplification of quality assurance and inspection processes for groove and ring assemblies

Additionally, the standard is relevant to aerospace engineers, designers, and quality managers who specify or verify radial retaining ring fitment in sophisticated mechanical systems.

Related Standards

SIST EN 3427:2009 complements other aerospace fastener and retaining ring standards, including:

• EN 4180 - Aerospace series retaining rings - Axial mounting dimensions
• EN 29000 series - Aerospace fasteners - General requirements
• ISO 464 - Retaining rings - Axial types for shafts and bores
• Various AECMA standards relating to mechanical fasteners and locking devices within aerospace systems

Compliance with EN 3427 ensures compatibility with these related standards, contributing to harmonized fastener solutions across the aerospace industry.

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Keywords: SIST EN 3427:2009, aerospace retaining rings, groove dimensions, radial mounting retaining rings, aerospace fasteners, CEN standard, engineering groove tolerance, retaining ring design, aerospace component standards.

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.LMRLuft-und Raumfahrt - Nuten für axial auf Wellen montierbare Sicherungsringe MaßeSérie aérospatiale - Dimensions des gorges pour anneaux d'arrêt à montage radialAerospace series - Groove dimensions for radial mounting retaining rings49.030.99Drugi vezni elementiOther fastenersICS:Ta slovenski standard je istoveten z:EN 3427:2006SIST EN 3427:2009en,de01-september-2009SIST EN 3427:2009SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 3427June 2006ICS 49.030.99 English VersionAerospace series - Groove dimensions for radial mountingretaining ringsSérie aérospatiale - Dimensions des gorges pour anneauxd'arrêt à montage radialLuf-und Raumfahrt - Nuten für radial montierbareSicherungsringe MaßeThis European Standard was approved by CEN on 20 April 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 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 translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.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, 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© 2006 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 3427:2006: ESIST EN 3427:2009
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