EN 4355:2008

Aerospace series - Six lobe recess - Drivers, socket

This standard specifies the characteristics of drivers, socket, six lobe recess, for aerospace applications.

Luft- und Raumfahrt - Sechs-Bogenzahn, Innenantrieb - Schraubendrehereinsätze, mit Innenvierkant für Schrauben

Diese Norm legt die Eigenschaften von Schraubendrehereinsätzen mit Innenvierkant für Sechs-Bogenzahn-Innenantrieb für Anwendungen in der Luft- und Raumfahrt fest.

Série aérospatiale - Empreinte six lobes - Embouts de tournevis - Carré d'entraînement

Aeronavtika - Šestzoba vdolbina, notranji pogon - Nastavki za izvijače, notranji četverorobnik za vijake

General Information

• Status: Published
• Publication Date: 25-Mar-2008
• Withdrawal Date: 29-Sep-2008
• ICS: 49.030.99 - Other fasteners
• 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 4355:2008 - Aerospace series - Six lobe recess - Drivers, socket

Overview

EN 4355:2008 is a European standard established by CEN that defines the specifications for drivers and sockets with a six lobe recess, specifically designed for aerospace applications. This standard ensures uniformity in the dimensions, configuration, and marking of six lobe recess tools, which are vital in high-precision aerospace fastening systems.

Six lobe recess tools, commonly known as Torx or star drivers, offer enhanced torque transfer and reduced cam-out compared to traditional screwdrivers. This makes them particularly suitable for demanding aerospace environments where reliability and safety are paramount.

Key Topics

• Scope: Focuses exclusively on drivers and sockets with six lobe recess profiles used in aerospace systems.
• Dimensions and Tolerances: Specifies detailed measurements in millimetres for driver and socket configurations, including tip dimensions and driving square sizes. Tolerances ensure interchangeability and precision.
• Material Requirements: Leaves material quality to manufacturers but requires compliance with the EN 4359 standard, which governs technical specifications of six lobe recess drivers.
• Designation and Marking: Provides a standardized method for tool identification, including recess code and compliance marking according to EN 2424 for aerospace products.
• Normative References: References key standards such as ISO 1174-1 and ISO 1174-2 for driving squares, EN 2424 for marking, and EN 4359 for technical specifications, ensuring alignment with broader industry norms.

Applications

EN 4355:2008 applies broadly within:

• Aerospace Manufacturing: Ensures precision in assembly tools used for aircraft maintenance, production, and repair.
• Defense Industries: Provides standardized tool specifications for military aerospace equipment, ensuring reliability under stringent conditions.
• Aerospace Component Assembly: Facilitates consistent fastening and torque application in critical aerospace mechanical joints.
• Maintenance and Repair Operations (MRO): Enhances tool compatibility and safety during routine and corrective maintenance on aircraft.
• Quality Assurance Processes: Helps organizations meet regulatory and safety requirements by using standardized tools with controlled parameters.

Using six lobe recess drivers and sockets adhering to the EN 4355:2008 standard not only improves the durability of fastened joints but also mitigates risks related to tool slipping or fastener damage, which is critical in aerospace engineering.

Related Standards

To fully implement the requirements of EN 4355:2008, familiarity with these associated standards is essential:

• EN 4359: Aerospace series covering technical specifications of six lobe recess drivers, supporting material and design criteria.
• ISO 1174-1 and ISO 1174-2: Governs the dimensions and requirements for driving squares used in hand and power socket tools, which interface with the six lobe recess tools.
• EN 2424: Specifies marking protocols for aerospace products, including tools, ensuring traceability and compliance.
• ASD-STAN Standards: Developed by the Aerospace and Defence Industries Association of Europe, encompassing broader aerospace tooling and fastener specifications that align with EN 4355:2008.

Summary

EN 4355:2008 establishes a critical framework for six lobe recess drivers and sockets used in aerospace applications, emphasizing standardized dimensions, tool design, and marking. This promotes safety, reliability, and interoperability within aerospace manufacturing and maintenance environments. By adhering to this standard, aerospace organizations ensure precise fastening operations, reduce tool-related failures, and comply with stringent aerospace industry requirements.

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Aerospace series - Six lobe recess - Drivers, socketSérie aérospatiale - Empreinte six lobes - Embouts de tournevis - Carré d'entraînementLuft- und Raumfahrt - Sechs-Bogenzahn, Innenantrieb - Schraubendrehereinsätze, mit Innenvierkant für Schrauben49.030.99Drugi vezni elementiOther fastenersICS:SIST EN 4355:2008enTa slovenski standard je istoveten z:EN 4355:200801-junij-2008SIST EN 4355:2008SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 4355March 2008ICS 49.030.99 English VersionAerospace series - Six lobe recess - Drivers, socketSérie aérospatiale - Empreinte six lobes - Embouts detournevis - Carré d'entraînementLuft- und Raumfahrt - Sechs-Bogenzahn, Innenantrieb -Schraubendrehereinsätze, mit Innenvierkant für SchraubenThis 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 4355:2008: E
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