kSIST FprEN 4509:2026

Aerospace series - Screw, 100° countersunk normal head, offset cruciform recess, threaded to head, in titanium alloy, anodized, with aluminium pigmented coating, metric series - Classification: 1 100 MPa (at ambient temperature)/315 °C

This document specifies the characteristics of screws, 100° countersunk normal head, offset cruciform recess, threaded to head, in titanium alloy, anodized, with aluminium pigmented coating, metric series.
Classification: 1 100 MPa /315 °C .

Luft- und Raumfahrt - 100° Senkschraube, mit Flügelkreuzschlitz, Gewinde annähernd bis Kopf, aus Titanlegierung, anodisiert, mit Aluminium pigmentierter Beschichtung, metrische Reihe - Klasse: 1 100 MPa (bei Raumtemperatur)/315 °C

Dieses Dokument legt die Eigenschaften von 100°-Senkschrauben mit Flügelkreuzschlitz, Gewinde annähernd bis Kopf, aus Titanlegierung, anodisiert, mit Aluminium pigmentierter Beschichtung der metrischen Reihe fest.
Klasse: 1 100 MPa1/315 °C2.

Série aérospatiale - Vis à tête fraisée 100° normale, à empreinte cruciforme déportée, filetées jusqu'à proximité de la tête, en alliage de titane, anodisées, avec revêtement alumino-organique, série métrique - Classification : 1 100 MPa (à température ambiante)/315 °C

Le présent document spécifie les caractéristiques des vis à tête fraisée 100° normale, à empreinte cruciforme déportée, filetées jusqu'à proximité de la tête, en alliage de titane, anodisées, avec revêtement alumino-organique, série métrique.
Classification : 1 100 MPa /315 °C.

Aeronavtika - Vijak, s 100° ugrezno glavo, križno zarezo, z navojem do glave, iz titanove zlitine, anodiziran, z aluminijevim pigmentiranim premazom, metrična serija - Klasifikacija: 1 100 MPa (pri temperaturi okolice)/315 °C

General Information

• Status: Not Published
• Public Enquiry End Date: 24-Dec-2024
• ICS: 49.025.20 - Aluminium
• ICS: 49.025.30 - Titanium
• ICS: 49.030.20 - Bolts, screws, studs
• Technical Committee: I13 - Imaginarni 13
• Current Stage: 5020 - Formal vote (FV) (Adopted Project)
• Start Date: 18-May-2026
• Due Date: 06-Jul-2026
• Completion Date: 19-May-2026
• Ref Project: FprEN 4509 - Aerospace series - Screw, 100° countersunk normal head, offset cruciform recess, threaded to head, in titanium alloy, anodized, with aluminium pigmented coating, metric series - Classification: 1 100 MPa (at ambient temperature)/315 °C

Relations

• Revises: SIST EN 4509:2009 - Aerospace series - Screws, 100 countersunk normal head, offset cruciform recess, threaded to head, in titanium alloy, anodized, with aluminium pigmented coating, metric series - Classification: 1 100 MPa (at ambient temperature) / 315 °C
• Effective Date: 23-Apr-2024

Overview

kSIST FprEN 4509:2026 is a European standard within the aerospace series, established by the Slovenski inštitut za standardizacijo (SIST). It specifies the characteristics of aerospace screws featuring a 100° countersunk normal head, offset cruciform recess, and full thread to the head. These screws are manufactured from titanium alloy, undergo anodization, and are finished with an aluminium pigmented coating. The standard applies to metric series screws, classified at 1 100 MPa minimum tensile strength at ambient temperature and rated for use up to 315 °C.

The document provides comprehensive specifications to ensure that these titanium alloy screws meet the stringent performance, durability, and marking requirements essential for aerospace and aviation applications.

Key Topics

• Material and Strength Classification:

  • Titanium alloy as defined in TR 3775
  • Strength class: 1 100 MPa (minimum tensile strength)
  • Maximum operating temperature: 315 °C as conditioned by the aluminium pigmented coating

• Head and Recess Design:

  • 100° countersunk head for flush mounting
  • Offset cruciform recess, compatible with ISO 14275 (ribbed) and ISO 14276 (unribbed) drive interfaces

• Thread Specifications:

  • Metric threads to ISO 5855-2
  • Full thread to the head for maximum grip and strength

• Surface Treatment:

  • Anodized titanium for corrosion resistance
  • Aluminium pigmented coating (EN 4474)
  • Lubrication by cetylic alcohol (chlorine free) per MIL-L-87132B

• Marking and Quality:

  • Product marking as per EN 2424
  • Manufacturers must maintain a quality management system, ideally in accordance with EN 9100

Applications

Screws conforming to kSIST FprEN 4509:2026 are primarily used in the aerospace and aviation sectors where high-strength, lightweight, and corrosion-resistant fastening solutions are required. Common application areas include:

• Aircraft structures:
  Used for assembly of fuselage, wings, and control surfaces

• Aviation maintenance:
  Suitable for repair and retrofit operations demanding strict compliance with material and process standards

• Aerospace systems:
  Integration into systems exposed to high stresses and elevated temperatures, benefiting from the screw’s strength rating and heat resistance

• Certification and OEM compliance:
  Adoption in qualification processes where traceability and standardized performance are required by aviation authorities and manufacturers

These screws are selected for environments requiring reliable mechanical performance, electrical neutrality, and minimized weight, making them ideal for both structural and system-level aerospace fastenings.

Related Standards

When implementing or specifying screws to kSIST FprEN 4509:2026, reference to the following related international and European standards ensures full compliance and optimal performance:

• EN 2424: Aerospace series - Marking of aerospace products
• EN 4474: Aerospace series - Aluminium pigmented coatings - Coating methods
• ISO 5855-2: Aerospace - MJ threads - Limit dimensions for bolts and nuts
• ISO 7913: Aerospace - Bolts and screws, metric - Tolerances of form and position
• ISO 9152: Aerospace - Bolts, with MJ threads, in titanium alloys, strength class 1 100 MPa
• ISO 14275 / ISO 14276: Aerospace - Drives, internal, offset cruciform, ribbed and unribbed
• EN 9100: Quality management systems for aviation, space, and defence organizations
• EN 9133: Qualification procedure for aerospace standard products

Adopting these referenced standards alongside kSIST FprEN 4509:2026 ensures holistic compliance with aerospace fastener requirements, supporting safe, high-performance, and certified applications.

Standards Content (Sample)

SLOVENSKI STANDARD
oSIST prEN 4509:2024
01-december-2024
Aeronavtika - Vijak, s 100° ugrezno glavo, križno zarezo, z navojem do glave, iz
titanove zlitine, anodiziran, z aluminijevim pigmentiranim premazom, metrična
serija - Klasifikacija: 1 100 MPa (pri temperaturi okolice)/315 °C
Aerospace series - Screw, 100° countersunk normal head, offset cruciform recess,
threaded to head, in titanium alloy, anodized, with aluminium pigmented coating, metric
series - Classification: 1 100 MPa (at ambient temperature)/315 °C
Luft- und Raumfahrt - 100° Senkschraube, mit Flügelkreuzschlitz, Gewinde annähernd
bis Kopf, aus Titanlegierung, anodisiert, mit Aluminium pigmentierter Beschichtung,
metrische Reihe - Klasse: 1 100 MPa (bei Raumtemperatur)/315 °C
Série aérospatiale - Vis à tête fraisée 100° normale, à empreinte cruciforme déportée,
filetées jusqu'à proximité de la tête, en alliage de titane, anodisées, avec revêtement
alumino-organique, série métrique - Classification : 1 100 MPa (à température
ambiante)/315 °C
Ta slovenski standard je istoveten z: prEN 4509
ICS:
49.025.20 Aluminij Aluminium
49.025.30 Titan Titanium
49.030.20 Sorniki, vijaki, stebelni vijaki Bolts, screws, studs
oSIST prEN 4509:2024 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST prEN 4509:2024
oSIST prEN 4509:2024
DRAFT
EUROPEAN STANDARD
prEN 4509
NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2024
ICS 49.030.20 Will supersede EN 4509:2006
English Version
Aerospace series - Screw, 100° countersunk normal head,
offset cruciform recess, threaded to head, in titanium alloy,
anodized, with aluminium pigmented coating, metric
series - Classification: 1 100 MPa (at ambient
temperature)/315 °C
Série aérospatiale - Vis à tête fraisée 100° normale, à Luft- und Raumfahrt - 100° Senkschraube, mit
empreinte cruciforme déportée, filetées jusqu'à Flügelkreuzschlitz, Gewinde annähernd bis Kopf, aus
proximité de la tête, en alliage de titane, anodisées, Titanlegierung, anodisiert, mit Aluminium
avec revêtement alumino-organique, série métrique - pigmentierter Beschichtung, metrische Reihe - Klasse:
Classification : 1 100 MPa (à température 1 100 MPa (bei Raumtemperatur)/315 °C
ambiante)/315 °C
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee ASD-
STAN.
If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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-CENELEC
Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 4509:2024 E
worldwide for CEN national Members.

oSIST prEN 4509:2024
prEN 4509:2024 (E)
Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Required characteristics . 4
4.1 Configuration – Dimensions – Masses . 4
4.2 Tolerances of form and position . 5
4.3 Materials . 5
4.4 Surface treatments . 5
5 Designation . 8
6 Marking . 8
7 Technical specification . 8

oSIST prEN 4509:2024
prEN 4509:2024 (E)
European foreword
This document (prEN 4509:2024) 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 document has
received the approval of the National Associations and the Official Services of the member countries of
ASD-STAN, prior to its presentation to CEN.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 4509:2006.
prEN 4509:2024 includes the following significant technical changes with respect to EN 4509:200
...