SIST EN 4359:2009

Aerospace series - Six lobe recess - Drivers - Technical specification

This standard specifies the characteristics, qualification and acceptance requirements for drivers for installing and removing screws and bolts having six lobe recess internal drive.

Luft- und Raumfahrt - Sechs-Bogenzahn-Innenantrieb - Schraubendrehereinsätze - Technische Lieferbedingungen

Diese Norm legt die Eigenschaften und die Anforderungen an die Qualifikation und Abnahme von Schrauben¬drehern mit einem Sechs-Bogenzahn-Innenantrieb zum Einsetzen und Entfernen von Schrauben fest.

Série aérospatiale - Empreinte six lobes - Embouts de tournevis - Spécification technique

Aeronavtika - Šestzoba vdolbina, notranji pogon - Nastavki za izvijače - Tehnična specifikacija

General Information

• Status: Published
• Publication Date: 31-Mar-2009
• ICS: 49.030.99 - Other fasteners
• Technical Committee: I13 - Imaginarni 13
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 20-Mar-2009
• Due Date: 25-May-2009
• Completion Date: 01-Apr-2009
• Ref Project: EN 4359:2006 - Aerospace series - Six lobe recess - Drivers - Technical specification

Overview

SIST EN 4359:2009 (CEN) is an aerospace series technical specification that defines the characteristics, qualification and acceptance requirements for drivers used to install and remove screws and bolts with a six-lobe internal drive. The standard addresses material, hardness, surface condition, coatings, dimensional tolerances and test procedures to ensure consistent performance and safety in aerospace assembly and maintenance.

Key Topics

• Scope and purpose: Applies to drivers for six-lobe recess (internal drive) fasteners used in aerospace environments and specifies acceptance and qualification methods.
• Material and hardness: Drivers shall be manufactured from rolled, drawn or forged steel with adequate strength and impact characteristics. Hardness is specified as Rockwell C56 to C64 and hardness testing follows ISO 6508-1.
• Dimensions and inspection: Recess geometry and dimensions are referenced to EN 3911. Dimensional checks use GO and NO-GO gauges; surface finishes must be free from defects that impair endurance or operator safety.
• Surface coating: A rust-preventative coating suitable for interim storage is required.
• Performance tests:
  • Proof load torque test: Drivers must withstand repeated torque applications at 60% of the minimum endurance torque (see Table 1) applied alternately clockwise and counter-clockwise for 50 cycles using a fixture representing the correct six-lobe recess. The fixture shall be heat treated to a minimum of Rockwell C65.
  • Toughness test: After endurance cycling, drivers are torqued to failure to confirm material toughness and that a permanent set occurs prior to fracture. Brittle failures without prior permanent set are cause for rejection.
• Sampling and acceptance: Visual, dimensional and torque tests use batch-based sampling plans (see Tables 4 and 5) to determine production acceptance. Quality assurance responsibilities align with EN 9133.

Applications

SIST EN 4359:2009 is intended for manufacturers, suppliers and procurement teams in the aerospace and defence industries who specify or produce drivers for six-lobe internal drive fasteners. Practical uses include:

• Specification of supplier acceptance criteria for production batches.
• Design and validation of tool sets used in aircraft assembly and maintenance.
• Defining test programs for torque endurance, toughness and hardness verification during qualification and routine inspection.

Benefits: consistent tool performance, reduced risk of fastener or tool failure, improved maintenance reliability and traceable quality assurance records.

Related Standards

• EN 3911 - Geometrical definition of six-lobe recess
• EN 4358 - Double-ended drivers, 90°
• EN 9133 - Quality management & qualification procedures for aerospace standard parts
• ISO 6508-1 - Rockwell hardness test method

For implementation, reference the product standard for identity marking, GO/NO-GO gauge dimensions and the endurance torque table. Compliance with SIST EN 4359:2009 supports robust procurement and testing practices for aerospace six-lobe drivers.

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.VSHFLILNDFLMDLuft- und Raumfahrt - Sechs-Bogenzahn-Innenantrieb - Schraubendrehereinsätze - Technische LieferbedingungenSérie aérospatiale - Empreinte six lobes - Embouts de tournevis - Spécification techniqueAerospace series - Six lobe recess - Drivers - Technical specification49.030.99Drugi vezni elementiOther fastenersICS:Ta slovenski standard je istoveten z:EN 4359:2006SIST EN 4359:2009en,de01-maj-2009SIST EN 4359:2009SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 4359December 2006ICS 49.030.99 English VersionAerospace series - Six lobe recess - Drivers - TechnicalspecificationSérie aérospatiale - Empreinte six lobes - Embouts detournevis - Spécification techniqueLuft- und Raumfahrt - Sechs-Bogenzahn, Innenantrieb -Schraubendrehereinsätze - Technische LieferbedingungenThis European Standard was approved by CEN on 28 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 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 4359:2006: ESIST EN 4359:2009

1) Published as ASD Prestandard at t
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