EN 4303:2005

• Abstract:

  This standard specifies the characteristics and technical requirements of tubular sleeves for tension screws with flush head, which may be plain or provided with a series of annular grooves, in corrosion resisting steel, passivated, with a 0,25 mm wall thickness, for maximum operating temperature 650 °C, for aerospace applications.

• Status: Published
• Publication Date: 06-Dec-2005
• Withdrawal Date: 29-Jun-2006
• ICS: 49.030.99 - Other fasteners
• Technical Committee: ASD-STAN - Aerospace
• Drafting Committee: ASD-STAN/D 3 - Mechanical
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 07-Dec-2005
• Completion Date: 07-Dec-2005
• Ref Project: SIST EN 4303:2006 - Aerospace series - Sleeves, tubular, for tension screws with flush head, in corrosion resisting steel, passivated, (0,25 mm wall thickness)

• Refers: ISO 2859-1:1999 - Sampling procedures for inspection by attributes — Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection
• Effective Date: 25-Aug-2026
• Refers: EN 2516:2023 - Aerospace series - Passivation of corrosion resisting steels and decontamination of nickel or cobalt base alloys
• Effective Date: 28-Jan-2026
• Refers: EN 196-1:1994 - Methods of testing cement - Part 1: Determination of strength
• Effective Date: 28-Jan-2026
• Refers: EN 2424:2008 - Aerospace series - Marking of aerospace products
• Effective Date: 28-Jan-2026

Overview

EN 4303:2005 is a European standard developed by CEN for aerospace applications. It specifies the requirements and characteristics of tubular sleeves used with tension screws that feature a flush head, constructed from corrosion-resisting steel and passivated, with a wall thickness of 0.25 mm. These sleeves are designed for high-performance environments and can be either plain or feature annular grooves, supporting aerospace component reliability at maximum operating temperatures up to 650 °C.

This standard is crucial as it establishes unified technical criteria for the design, material, manufacturing, and inspection of sleeves, ensuring quality and interchangeability in critical aerospace assemblies.

Key Topics

• Material and Surface Treatments
  • Corrosion-resisting steel, passivated as required by EN 2516
  • Wall thickness: 0.25 mm
  • Maximum operating temperature: 650 °C
• Forms and Dimensions
  • Available as plain or annular grooved sleeves
  • Dimensions, tolerances, and form codes standardized for consistency
  • Dimensional requirements apply after surface treatment
• Manufacturing Process
  • Sleeves are formed by drawing from sheet or strip stock to create a one-piece tubular section and head
  • The final product must be free from cracks, seams, and laps
• Quality Assurance
  • Inspections and sampling requirements as per ISO 2859-1
  • Acceptance based on a 1% AQL (Acceptance Quality Limit)
  • Marking of aerospace products as per EN 2424
• Designation System
  • Standardized designation for easy identification (includes standard number, form, diameter, and length codes)

Applications

EN 4303:2005 finds primary use in the aerospace industry, where high-strength, corrosion-resistant, and precisely manufactured sleeves are required for tension screws with flush head designs. Typical areas of application include:

• Aircraft structural assemblies: Ensuring reliable fastening in frames, fuselage, or wing structures where flush mounting of fasteners is essential for aerodynamic or spatial requirements.
• Spacecraft hardware: Delivering durability and resistance to both mechanical stress and corrosion in extreme temperature environments.
• Aerospace maintenance and repair: Supporting standardized replacements and qualified repairs to maintain safety and performance.

The use of passivated, corrosion-resisting steel sleeves ensures long-term performance and reduced maintenance, critical for aerospace safety and operational efficiency.

Related Standards

For comprehensive adoption and compliance, EN 4303:2005 references and aligns with several other key standards, including:

• EN 2175: Covers heat-resisting alloy sheet, strip, and plate materials used in aerospace.
• EN 2424: Specifies marking requirements for aerospace products.
• EN 2516: Details passivation and decontamination methods for corrosion-resisting steels and nickel alloys.
• ISO 2859-1: Provides sampling procedures for inspection by attributes, ensuring robust quality control in manufacturing batches.

Organizations and manufacturers aiming for conformity with EN 4303:2005 should be familiar with these related standards to ensure complete regulatory and quality assurance compliance throughout production and application.

---

Keywords: EN 4303:2005, aerospace sleeves, tension screws, flush head, corrosion-resisting steel, passivated, aerospace standards, CEN, technical requirements, inspection, passivation, quality assurance, European standard.

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Aerospace series - Sleeves, tubular, for tension screws with flush head, in corrosion resisting steel, passivated, (0,25 mm wall thickness)Aeronavtika – Puše, cevaste, za vijake z ugrezno glavo za natezno obremenitev, iz korozijsko odpornega jekla, pasivirane (debelina stene 0,25 mm)Série aérospatiale - Douilles tubulaires, pour vis de traction a tete fraisée, en acier résistant a la corrosion, passivées, (épaisseur de paroi 0,25 mm)Luft- und Raumfahrt - Hülsen für Senkschrauben mit Zugbeanspruchung, aus korrosionsbeständigem Stahl, passiviert, (Wanddicke 0,25 mm)Ta slovenski standard je istoveten z:EN 4303:2005SIST EN 4303:2006en49.030.99ICS:SLOVENSKI
STANDARDSIST EN 4303:200601-september-2006

EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 4303December 2005ICS 49.030.99 English VersionAerospace series - Sleeves, tubular, for tension screws withflush head, in corrosion resisting steel, passivated, (0,25 mmwall thickness)Série aérospatiale - Douilles tubulaires, pour vis de tractionà tête fraisée, en acier résistant à la corrosion, passivées,(épaisseur de paroi 0,25 mm)Luft- und Raumfahrt - Hülsen für Senkschrauben mitZugbeanspruchung, aus korrosionsbetändigem Stahl,passiviert, (Wanddicke 0,25 mm)This European Standard was approved by CEN on 26 October 2005.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, 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© 2005 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 4303:2005: E
...