SIST EN 4074:2009

Aerospace series - Screws, pan head, six lobe recess, coarse tolerance normal shank, medium length thread, in titanium alloy, aluminium IVD coated - Classification: 1100 MPa (at ambient temperature)/425 °C

This standard specifies the characteristics of screws, pan head, six lobe recess, coarse tolerance normal shank, medium length thread, in titanium alloy, aluminium IVD coated.
Classification: 1 100 MPa / 425 °C

Luft- und Raumfahrt - Flachkopfschrauben mit Sechs-Bogenzahn, mit mittlerer Gewindelänge, aus Titanlegierung, Aluminium IVD beschichtet - Klasse: 1100 MPa (bei Raumtemperatur)/425 °C

Diese Norm legt die Eigenschaften für Flachkopfschrauben mit Sechs-Bogenzahn, mit mittlerer Gewindelänge,
aus Titanlegierung, aluminium-IVD-beschichtet, fest.
Klasse: 1 100 MPa1) / 425 °C2)

Série aérospatiale - Vis à tête cylindrique, à empreinte six lobes, tige normale à tolérance large, filetage moyen, en alliage de titane, revêtues d'aluminium IVD - Classification: 490 MPa (à température ambiante)/425 °C

Aeronavtika - Vijaki, valjasta glava, šestzoba vdolbina, široka toleranca, srednja navojna dolžina, iz titanove zlitine, prevlečene z aluminijem IVD - Klasifikacija: 1100 MPa (pri temperaturi okolice)/425 °C

General Information

• Status: Published
• Publication Date: 20-Aug-2009
• ICS: 49.025.20 - Aluminium
• ICS: 49.025.30 - Titanium
• ICS: 49.030.20 - Bolts, screws, studs
• Technical Committee: I13 - Imaginarni 13
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 13-Jul-2009
• Due Date: 17-Sep-2009
• Completion Date: 21-Aug-2009
• Ref Project: EN 4074:2009 - Aerospace series - Screws, pan head, six lobe recess, coarse tolerance normal shank, medium length thread, in titanium alloy, aluminium IVD coated - Classification: 1 100 MPa (at ambient temperature) / 425 °C

Overview

SIST EN 4074:2009 is a European standard developed by CEN that specifies the technical requirements for aerospace series screws with pan heads, six lobe recess, coarse tolerance normal shank, and medium length threads. These screws are manufactured from a titanium alloy and feature an aluminium IVD (Ion Vapor Deposition) coating. The standard classifies these screws with a minimum tensile strength of 1100 MPa at ambient temperature and ensures performance up to 425 °C without degradation.

This standard is essential for aerospace applications where strong, lightweight, and corrosion-resistant fasteners are critical, especially when operating under high-temperature conditions. SIST EN 4074:2009 supports consistent quality, interchangeability, and reliability of screws used throughout the aerospace industry.

Key Topics

• Material and Coating:

  • Titanium alloy screws offering high strength and low weight.
  • Aluminium IVD coating enhances corrosion resistance and surface durability.
  • Surface treatment compliant with MIL-DTL-83488D Type II, class 3.

• Mechanical Properties:

  • Classification of screws with tensile strength of 1100 MPa (ambient temperature).
  • Capability to withstand temperatures up to 425 °C without permanent change in properties.

• Design Specifications:

  • Pan head design with six lobe (six-Bogenzahn) recess for secure tooling engagement.
  • Coarse tolerance for normal shank diameter ensuring dimensional precision.
  • Medium length threads following aerospace-specific pitch and dimensions.

• Dimensional Tolerances:

  • Strict measurement guidelines per ISO 3353-1 and ISO 5855-2 for thread and bolt dimensions.
  • Geometrical tolerance adherence as detailed in ISO 7913.

• Marking and Identification:

  • Marking standardized according to EN 2424 for traceability.
  • Clear designation codes including diameter, length, hole type, and lubrication status.

• Quality Assurance:

  • Compliance with aerospace quality management system standards EN 9100 and EN 9133.
  • Manufacturer approval and product qualification standards outlined to ensure reliability.

Applications

SIST EN 4074:2009 screws are specifically tailored for the aerospace industry, meeting the rigorous demands of aircraft manufacturing and maintenance. Key uses include:

• Aircraft Structural Assemblies: Fastening critical components where strength-to-weight ratio is paramount.
• Engine Components: Screws capable of withstanding high thermal and mechanical stress.
• Spacecraft Systems: Corrosion-resistant fasteners suitable for varied environmental extremes.
• Defense Equipment: Reliable screws ensuring operational integrity under high performance conditions.

These titanium alloy screws with aluminium IVD coating are ideal where long-term durability, resistance to corrosion, and high tensile strength are necessary for safety-critical applications.

Related Standards

To fully implement SIST EN 4074:2009, awareness of complementary standards is important:

• EN 2424: Aerospace series - Marking of aerospace products ensures uniform identification and traceability.
• EN 3911: Aerospace series - Six lobe recess - Geometrical definition for screw drive compatibility.
• EN 9100: Aerospace series - Quality management systems - Requirements based on ISO 9001 for industry quality assurance.
• EN 9133: Aerospace series - Quality management systems - Qualification procedure for aerospace standard parts.
• ISO 3353-1: Aerospace - Rolled external threads for bolts and screws.
• ISO 5855-2: Aerospace - Metric threads diameter and tolerance limits.
• ISO 7913: Aerospace - Tolerances of form and position.
• ISO 9152: Aerospace - Procurement specification for bolts with MJ threads in titanium alloys.

Complying with these related standards ensures complete conformity, quality control, and operational reliability for aerospace fasteners manufactured under SIST EN 4074:2009.

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Keywords: SIST EN 4074:2009, aerospace screws, titanium alloy screws, aluminium IVD coated screws, six lobe recess screws, aerospace fasteners, high tensile strength screws, aerospace standards, aerospace bolts, corrosion resistant screws, aviation hardware, aerospace manufacturing standards.

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Luft- und Raumfahrt - Flachkopfschrauben mit Sechs-Bogenzahn, mit mittlerer Gewindelänge, aus Titanlegierung, Aluminium IVD beschichtet - Klasse: 1100 MPa (bei Raumtemperatur)/425 °CSérie aérospatiale - Vis à tête cylindrique, à empreinte six lobes, tige normale à tolérance large, filetage moyen, en alliage de titane, revêtues d'aluminium IVD - Classification: 490 MPa (à température ambiante)/425 °CAerospace series - Screws, pan head, six lobe recess, coarse tolerance normal shank, medium length thread, in titanium alloy, aluminium IVD coated - Classification: 1100 MPa (at ambient temperature)/425 °C49.030.20Sorniki, vijaki, stebelni vijakiBolts, screws, studs49.025.30TitanTitanium49.025.20AluminijAluminiumICS:Ta slovenski standard je istoveten z:EN 4074:2009SIST EN 4074:2009en,de01-oktober-2009SIST EN 4074:2009SLOVENSKI
STANDARD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 4074
July 2009 ICS 49.030.20 English Version
Aerospace series - Screws, pan head, six lobe recess, coarse tolerance normal shank, medium length thread, in titanium alloy, aluminium IVD coated - Classification: 1 100 MPa (at ambient temperature) / 425 °C
Série aérospatiale - Vis à tête cylindrique, à empreinte six lobes, tige normale à tolérance large, filetage moyen, en alliage de titane, revêtues d'aluminium IVD - Classification: 490 MPa (à température ambiante) / 425 °C
Luft- und Raumfahrt - Flachkopfschrauben mit Sechs-Bogenzahn, mit mittlerer Gewindelänge, aus Titanlegierung, Aluminium IVD beschichtet - Klasse: 1 100 MPa (bei Raumtemperatur) / 425 °C This European Standard was approved by CEN on 6 June 2009.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards 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 translation under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the official 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 STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre:
Avenue Marnix 17,
B-1000 Brussels © 2009 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 4074:2009: ESIST EN 4074:2009
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