SIST EN 4509:2026

• Abstract:

  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 .

• Status: Published
• Public Enquiry End Date: 24-Dec-2024
• Publication Date: 29-Sep-2026
• 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: 29-Sep-2026
• Due Date: 04-Dec-2026
• Completion Date: 30-Sep-2026
• Ref Project: EN 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

• Refers: SIST EN 2424:2008 - Aerospace series - Marking of aerospace products
• Effective Date: 30-Sep-2026
• Refers: SIST EN 4473:2025 - Aerospace series - Aluminium pigmented organic coatings for fasteners - Technical specification
• Effective Date: 30-Sep-2026
• 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

SIST EN 4509:2026 is an aerospace standard for a specific type of fastener used in demanding aircraft and aerospace assemblies. It specifies the characteristics of a 100° countersunk normal head screw with an offset cruciform recess, threaded to head, made in titanium alloy, anodized, and finished with an aluminium pigmented coating for the metric series.

This standard is aligned with the classification 1 100 MPa / 315 °C, indicating suitability for high-strength aerospace applications under elevated temperature conditions. For manufacturers, engineers, and procurement teams, SIST EN 4509 supports consistent design, interchangeability, and compliance in aerospace fastening systems.

Key Topics

The standard covers the practical requirements needed to define and verify the screw type, including:

• Configuration, dimensions, and masses
• Tolerances of form and position
• Material requirements for titanium alloy fasteners
• Surface treatment requirements, including anodizing and aluminium pigmented coating
• Drive codes for offset cruciform recess variants
• Marking and designation rules for identification and traceability
• Technical specification expectations for aerospace production and qualification

A notable feature of the document is that dimensions and tolerances are expressed in millimetres and apply after coating, which is important for production control and inspection. The standard also references supporting requirements for aerospace marking, coating methods, MJ threads, and quality-related qualification practices.

For organizations involved in aerospace fastener supply, the document helps ensure that screws meet the required performance and documentation expectations without ambiguity.

Applications

SIST EN 4509 is relevant wherever reliable, lightweight, and high-strength fastening is required in aerospace engineering. Typical use cases include:

• Aircraft structures and assemblies
• Aerospace maintenance and replacement parts
• High-performance fastening systems
• Metric-series titanium fasteners in controlled environments
• Components requiring surface protection and traceable marking

Because the screws are specified with aerospace-grade material and coating requirements, the standard is especially valuable in applications where consistency, durability, and controlled manufacturing processes are essential.

The document also supports procurement and quality assurance by providing a common reference for product definition, supplier communication, and conformance checking.

Related Standards

SIST EN 4509 refers to several important aerospace standards and specifications, including:

• EN 2424 - Marking of aerospace products
• EN 4474 - Aluminium pigmented coatings - Coating methods
• ISO 5855-2 - MJ threads - Limit dimensions for bolts and nuts
• ISO 7913 - Tolerances of form and position
• ISO 9152 - Procurement specification for titanium alloy aerospace bolts and screws
• ISO 14275 and ISO 14276 - Internal offset cruciform drive systems
• EN 9100 - Quality management systems for aviation, space and defence
• EN 9133 - Qualification procedure for aerospace standard products

These related standards help support a complete aerospace compliance framework for design, manufacture, marking, coating, and qualification of fastening products.

SLOVENSKI STANDARD
01-november-2026
Aeronavtika - Vijak, s 100° ugrezno glavo, križno zarezo, z navojem do glave, iz
titanove zlitine, anodiziran, z aluminijevim pigmentiranim premazom, metrična
serija - Klasifikacija: 1100 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: EN 4509:2026
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.

EN 4509
EUROPEAN STANDARD
NORME EUROPÉENNE
September 2026
EUROPÄISCHE NORM
ICS 49.030.20
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, filetée jusqu'à Flügelkreuzschlitz, Gewinde annähernd bis Kopf, aus
proximité de la tête, en alliage de titane, anodisée, avec Titanlegierung, anodisiert, mit Aluminium
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 European Standard was approved by CEN on 3 August 2026.

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-CENELEC 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-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.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2026 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 4509:2026 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Required characteristics . 5
4.1 Configuration — Dimensions Mass . 5
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
7.1 General. 8
7.2 Approval of manufacturers . 8
7.3 Qualification of screws . 9
Bibliography . 10

European foreword
This document (EN 4509:2026) has been prepared by 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 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 March 2027, and conflicting national standards shall
be withdrawn at the latest by March 2027.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can
...