EN 3710:2008

Aerospace series - Sockets, bi-hexagonal - Technical Specification

This standard specifies the properties of double-hex sockets for aerospace use.

Luft- und Raumfahrt - Steckschlüsseleinsätze, Doppelsechskant - Technische Lieferbedingungen

Diese Norm legt die Eigenschaften von Steckschlüsseleinsätzen mit Doppelsechskant für die Anwendung in der Luft- und Raumfahrt fest.

Série aérospatiale - Douille bihexagonale - Spécification technique

Aeronavtika - Obojke, biheksagonalne - Tehnična specifikacija

General Information

• Status: Published
• Publication Date: 08-Apr-2008
• Withdrawal Date: 30-Oct-2008
• ICS: 25.140.30 - Hand-operated tools
• Technical Committee: ASD-STAN - Aerospace
• Drafting Committee: ASD-STAN/D 3 - Mechanical
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 09-Apr-2008
• Completion Date: 09-Apr-2008
• Ref Project: SIST EN 3710:2008 - Aerospace series - Sockets, bi-hexagonal - Technical Specification

Overview

EN 3710:2008 is a European standard developed by the Aerospace and Defence Industries Association of Europe (ASD-STAN) under CEN. It specifies the technical requirements for double-hex (bi-hexagonal) sockets designed specifically for aerospace applications. These sockets are critical components in aerospace maintenance and assembly, requiring precise manufacturing tolerances, material properties, hardness levels, and surface treatments to ensure safety, durability, and reliability in demanding environments.

This standard provides detailed criteria covering the configuration, dimensions, tolerances, materials, hardness, surface treatment, designation, and marking relevant to aerospace-grade double-hex sockets.

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Key Topics

• Scope and Application
  EN 3710:2008 defines the properties of double-hex sockets used mainly in aerospace, emphasizing compliance with mechanical and quality standards essential for aerospace fasteners.

• Dimensions and Configuration
  The standard mandates specific dimensional guidelines and tolerances for socket openings aligned with ISO 691, as well as driving square specifications conforming to ISO 1174-1 and ISO 1174-2. A detailed table (Table 1) and figure illustrate lengths, widths, and critical dimensions for various socket sizes.

• Material and Hardness
  While the choice of material is left to the manufacturer’s discretion, hardness requirements are stringent to ensure performance under mechanical stress. The hardness of the square drive sockets must be between 42 and 54 HRC, complying with hardness testing procedures set forth in EN 3709.

• Surface Treatment
  The standard requires nickel-chromium plating with minimum layer thicknesses (5 μm nickel and 0.25 μm chromium), providing corrosion resistance and durability, crucial for aerospace environmental conditions.

• Designation and Marking
  EN 3710:2008 prescribes a clear socket designation format for identification, including the EN standard number, socket length code, square drive size, and width across flats. Marking must follow EN 2424 Style C, including a knurling zone and tagging for traceability.

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Applications

• Aerospace Assembly and Maintenance
  Double-hex sockets adhering to EN 3710:2008 are essential for the precise assembly and maintenance of aircraft, spacecraft, and related aerospace structures. Their compliance ensures compatibility with standardized fasteners and tools used across the aerospace industry.

• High-Performance Fastening Systems
  These sockets are used wherever high torque applications require reliable, wear-resistant fastening tools with strict dimensional tolerances, especially in critical aerospace joints to maintain structural integrity and safety.

• Tool Manufacturing for Aerospace Industry
  Tool manufacturers utilize this standard as a benchmark to produce double-hex sockets tailored for aerospace applications, thus ensuring product quality and industry acceptance.

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Related Standards

• EN 3709 – Defines hardness testing and specifications for bi-hexagonal wrenches and sockets.
• ISO 691 – Outlines tolerances for wrench and socket openings used in assembly tools.
• ISO 1174-1 & ISO 1174-2 – Set standards for driving squares used in hand and power socket tools.
• EN 2424 – Specifies marking requirements for aerospace components ensuring traceability.
• AECMA Standards – Aerospace committee standards referenced for product conformity within the aerospace sector.

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By adhering to EN 3710:2008, aerospace manufacturers and tool producers ensure that double-hexagonal sockets meet stringent mechanical and quality demands, contributing to enhanced safety, performance, and interoperability in aerospace hardware assembly and maintenance. This standard is key for professionals involved in aerospace fasteners, tooling design, and aerospace quality assurance.

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Luft- und Raumfahrt - Steckschlüsseleinsätze, Doppelsechskant - Technische LieferbedingungenSérie aérospatiale - Douille bihexagonale - Spécification techniqueAerospace series - Sockets, bi-hexagonal - Technical Specification49.030.99Drugi vezni elementiOther fastenersICS:Ta slovenski standard je istoveten z:EN 3710:2008SIST EN 3710:2008en01-julij-2008SIST EN 3710:2008SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 3710April 2008ICS 25.140.30 English VersionAerospace series - Sockets, bi-hexagonal - TechnicalSpecificationSérie aérospatiale - Douille bihexagonale - SpécificationtechniqueLuft- und Raumfahrt - Steckschlüsseleinsätze,Doppelsechskant - Technische LieferbedingungenThis European Standard was approved by CEN on 21 December 2007.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 3710:2008: ESIST EN 3710:2008

Figures Figure 1.5
Tables Table 1.5
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