EN 4499:2009

Aerospace series - Screws, 100° countersunk reduced head, offset cruciform recess, close tolerance normal shank, short thread, in titanium alloy, anodized, with aluminium pigmented coating - Classification: 1 100 MPa (at ambient temperature) / 315 °C

This standard specifies the characteristics of screws, 100° countersunk reduced head, offset cruciform recess, close tolerance normal shank, short thread, in titanium alloy, anodized, with aluminium pigmented coating.
Classification: 1 100 MPa  ) / 315 °C  ).

Luft- und Raumfahrt - 100° Senk-Paßschrauben, mit kleinem Kopf, mit Flügelkreuzschlitz, kurzes Gewinde, aus Titanlegierung, anodisiert, mit aluminiumpigmentierter Beschichtung - Klasse: 1 100 MPa (bei Raumtemperatur)/315 °C

Série aérospatiale - Vis à tête fraisée 100° réduite, à empreinte cruciforme déportée, fût normal à tolérance serrée, filetage court, en alliage de titane, anodisées, avec revêtement alumino-organique - Classification: 1 100 MPa (à température ambiante) / 315 °C

Aeronavtika - Vijaki, 100° ugrezna glava, križna zareza, polno steblo, ozka toleranca, kratek navoj, iz titanove zlitine, anodizirani, z aluminijem pigmentiranim premazom - Klasifikacija: 1100 MPa (pri temperaturi okolice)/315 °C

General Information

• Status: Published
• Publication Date: 10-Feb-2009
• Withdrawal Date: 30-Aug-2009
• ICS: 49.030.20 - Bolts, screws, studs
• Technical Committee: ASD-STAN - Aerospace
• Drafting Committee: ASD-STAN/D 3 - Mechanical
• Current Stage: 9093 - Decision to confirm - Review Enquiry
• Start Date: 21-Jan-2025
• Completion Date: 14-May-2025
• Ref Project: SIST EN 4499:2009 - Aerospace series - Screws, 100° countersunk reduced head, offset cruciform recess, close tolerance normal shank, short thread, in titanium alloy, anodized, with aluminium pigmented coating - Classification: 1 100 MPa (at ambient temperature) / 315 °C

Overview

EN 4499:2009 is a European standard developed by CEN that specifies detailed requirements for aerospace-grade screws. These screws feature a 100° countersunk reduced head with an offset cruciform recess, designed for high precision applications. Manufactured from titanium alloy, the screws are anodized and coated with an aluminium pigmented finish, enhancing corrosion resistance and durability. The screws classified under this standard possess a tensile strength of 1100 MPa at ambient temperature and maintain integrity up to 315 °C, making them suitable for critical aerospace environments.

This standard ensures uniformity in the manufacture, testing, marking, and classification of such fasteners, reinforcing reliability and safety in aerospace systems.

Key Topics

• Screw Configuration
  Screws covered by EN 4499 have:

  • A 100° countersunk reduced head for flush mounting
  • Offset cruciform recess (Torq-Set) for secure drive engagement
  • Close tolerance normal shank for precision fit
  • Short threaded length to meet structural requirements
  • Titanium alloy base material for lightweight and high strength

• Material and Surface Treatment

  • Titanium alloy certified to a strength class of 1100 MPa as per aerospace material specifications
  • Anodized surface treatment combined with aluminium pigmented coating to enhance corrosion resistance and maintain coating integrity at elevated temperatures (up to 315 °C)
  • Lubrication with cetyl alcohol (chlorine free), following SAE AS87132, to reduce friction during installation

• Tolerance and Dimensions

  • Conformance with ISO 13921 and ISO 7913 for precise thread and form tolerances
  • Dimensions standardized in millimetres, with tolerances applying after coating
  • Both customary size codes and length increments provided for easy selection of screw sizes from diameter 4 mm to 20 mm and lengths up to 200 mm

• Marking and Designation

  • Clear identification marking embossed on the head following EN 2424 for traceability
  • Designation code includes standard number, hole code, diameter, length, and drive type for unambiguous ordering and inspection

• Manufacturing and Quality Assurance

  • Manufacturer approval according to EN 9100 aerospace quality management system standards
  • Qualification and testing of bolts using EN 9133 guidelines
  • Oversized bolts accommodated under EN 4016 where applicable

Applications

EN 4499:2009 titanium screws are primarily intended for aerospace and defense industries where high strength-to-weight ratios, corrosion resistance, and reliability under thermal stress are critical. Typical applications include:

• Aircraft structural assemblies requiring lightweight, durable fasteners
• Spacecraft components exposed to temperature extremes up to 315 °C
• Precision mechanical systems within avionics and engine parts
• Maintenance and repair operations needing standardized, certified fasteners
• Aerospace manufacturing lines ensuring conformity to strict quality and safety standards

Related Standards

EN 4499:2009 aligns closely with several international and European aerospace standards, ensuring comprehensive coverage of requirements:

• EN 2424 – Marking of aerospace products for identification and traceability
• EN 4016 – Specifications for oversized aerospace bolts
• EN 4473 & EN 4474 – Technical specifications and coating methods for aluminium pigmented coatings
• ISO 13921 – Dimension standards for screws with reduced countersunk heads
• ISO 7994 & ISO 14275 – Standards for internal drive offset cruciform recesses (Torq-Set)
• EN 9100 & EN 9133 – Aerospace quality management and qualification procedures
• ISO 9152 – Requirements for titanium alloy bolts with strength class of 1100 MPa

These complementary standards ensure that EN 4499 screws integrate seamlessly into aerospace component supply chains and quality systems.

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Keywords: EN 4499:2009, aerospace screws, titanium alloy screws, 100° countersunk head, offset cruciform recess, anodized titanium screws, aluminium pigmented coating, aerospace fasteners, high strength screws, aerospace standards, aerospace bolts and screws, precision aerospace fasteners, aerospace quality standard.

Standards Content (Sample)

SLOVENSKI STANDARD
01-maj-2009
Aeronavtika - Vijaki, 100° ugrezna glava, križna zareza, polno steblo, ozka
toleranca, kratek navoj, iz titanove zlitine, anodizirani, z aluminijem pigmentiranim
premazom - Klasifikacija: 1100 MPa (pri temperaturi okolice)/315 °C
Aerospace series - Screws, 100° countersunk reduced head, offset cruciform recess,
close tolerance normal shank, short thread, in titanium alloy, anodized, with aluminium
pigmented coating - Classification: 1 100 MPa (at ambient temperature) / 315 °C
Luft- und Raumfahrt - 100° Senk-Paßschrauben, mit kleinem Kopf, mit
Flügelkreuzschlitz, kurzes Gewinde, aus Titanlegierung, anodisiert, mit
aluminiumpigmentierter Beschichtung - Klasse: 1 100 MPa (bei Raumtemperatur)/315 °C
Série aérospatiale - Vis à tête fraisée 100° réduite, à empreinte cruciforme déportée, fût
normal à tolérance serrée, filetage court, en alliage de titane, anodisées, avec
revêtement alumino-organique - Classification: 1 100 MPa (à température ambiante) /
315 °C
Ta slovenski standard je istoveten z: EN 4499:2009
ICS:
49.025.20 Aluminij Aluminium
49.025.30 Titan Titanium
49.030.20 Sorniki, vijaki, stebelni vijaki Bolts, screws, studs
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 4499
NORME EUROPÉENNE
EUROPÄISCHE NORM
February 2009
ICS 49.030.20
English Version
Aerospace series - Screws, 100° countersunk reduced head,
offset cruciform recess, close tolerance normal shank, short
thread, in titanium alloy, anodized, with aluminium pigmented
coating - Classification: 1 100 MPa (at ambient temperature) /
315° C
Série aérospatiale - Vis à tête fraisée 100° réduite, à Luft- und Raumfahrt – 100° Senk-Paßschrauben, mit
empreinte cruciforme déportée, fût normal à tolérance kleinem Kopf, mit Flügelkreuzschlitz, kurzes Gewinde, aus
serrée, filetage court, en alliage de titane, anodisées, avec Titanlegierung, anodisiert,mit Aluminium pigmenttete
revêtement alumino-organique - Classification: 1 100 MPa Beschichtung - Klasse: 1 100 MPa (bei Raumtemperatur) /
(à température ambiante) / 315° C 315° C
This European Standard was approved by CEN on 21 June 2008.

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 Ref. No. EN 4499:2009: E
worldwide for CEN national Members.

Contents Page
Foreword .3
1 Scope .4
2 Normative references .4
3 Required characteristics .5
3.1 Configuration - Dimensions - Masses .5
3.2 Tolerances of form and position .5
3.3 Materials .5
3.4 Surface treatments .5
4 Designation .8
5 Marking .8
6 Technical specification .9
6.1 General .9
6.2 Approval of manufacturers .9
6.3 Qualification of bolts .9
6.4 Requirement deleted .9
7 Oversized bolts .9

Foreword
This document (EN 4499:2009) has been prepared by the Aerospace and Defence Industries Association of
Europe - Standardization (ASD-STAN).
After enquiries and votes carried out in accordance with the rules of this Association, this Standard has
received the approval of the National Associations and the Official Services of the member countries of ASD,
prior to its presentation to CEN.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by August 2009, and conflicting national standards shall be withdrawn at
the latest by August 2009.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxe
...