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
• Publication Date: 01-Sep-2026
• ICS: 49.030.20 - Bolts, screws, studs
• Technical Committee: ASD-STAN - Aerospace
• Drafting Committee: ASD-STAN/D 3/S 2 - Fasteners
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 02-Sep-2026
• Completion Date: 02-Sep-2026
• Ref Project: SIST 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: ISO 3353-1:2020 - Aerospace — Lead and runout threads — Part 1: Rolled external threads
• Effective Date: 30-Sep-2026
• Refers: ISO 14276:2002 - Aerospace — Drives, internal, offset cruciform — Metric series
• Effective Date: 30-Sep-2026
• Refers: ISO 14275:2002 - Aerospace — Drives, internal, offset cruciform, ribbed — Metric series
• Effective Date: 30-Sep-2026
• Refers: ISO 5855-2:1999 - Aerospace — MJ threads — Part 2: Limit dimensions for bolts and nuts
• Effective Date: 30-Sep-2026
• Refers: EN 4473:2024 - Aerospace series - Aluminium pigmented organic coatings for fasteners - Technical specification
• Effective Date: 30-Sep-2026
• Refers: EN 2424:2008 - Aerospace series - Marking of aerospace products
• Effective Date: 30-Sep-2026
• Refers: ISO 7913:1994 - Aerospace — Bolts and screws, metric — Tolerances of form and position
• Effective Date: 30-Sep-2026
• Refers: ISO 9152:1998 - Aerospace — Bolts, with MJ threads, in titanium alloys, strength class 1 100 MPa — Procurement specification
• Effective Date: 30-Sep-2026
• Revises: EN 4509:2006 - 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

EN 4509:2026 is a CEN European Standard for aerospace screws with a 100° countersunk normal head, offset cruciform recess, threaded to head, made in titanium alloy and finished with anodizing and an aluminium pigmented coating. It specifies the product characteristics, designation, marking and technical specification for the metric series, in strength class 1 100 MPa (at ambient temperature)/315 °C.

What does EN 4509:2026 specify?

EN 4509:2026 specifies the characteristics of one specific aerospace screw type and the rules used to identify, mark and qualify it. In practice, it is the document a purchaser, manufacturer or quality team uses when they need this exact fastener form, material and surface treatment.

The document is organized into clauses on scope, normative references, terms and definitions, required characteristics, designation, marking and technical specification, followed by a bibliography. That structure helps readers move from product definition to ordering data, then to approval and qualification.

What are the key requirements of EN 4509:2026?

EN 4509:2026 ties the screw to a defined geometry, a titanium-alloy material, a specified surface system and a controlled qualification route. The main point is that the screw is not described only by size - it is also controlled by thread form, drive type, coating and aerospace approval practice.

Geometry, dimensions and mass

Clause 4.1 requires configuration, dimensions and mass to follow Figure 1 and Table 1. Dimensions are in millimetres and apply after coating, so inspection has to consider the finished part, not just the raw machined screw. Unstated form details are left to the manufacturer, which gives some design freedom while keeping the critical interfaces fixed.

Tolerances and thread form

Clause 4.2 applies ISO 7913 for tolerances of form and position. Table 1 identifies MJ threads, with the thread limits taken from ISO 5855-2 and the lead and runout thread detail linked to ISO 3353-1. For users, this means the screw must fit the mating aerospace thread system and stay within defined positional accuracy.

Material and strength class

Clause 4.3 requires materials in accordance with TR 3775 for titanium alloy, strength class 1 100 MPa. The classification also links the screw to 315 °C, with the maximum temperature determined by the coating. In practice, buyers and engineers need to match this to the service temperature and load level of the assembly.

Surface treatment and lubrication

Clause 4.4 requires surface treatment in accordance with EN 4473. It also allows cetyl alcohol lubrication in accordance with EN 6117 or SAE AS87132, and states that anodizing may be omitted if parts are blasted before surface treatment. That matters for procurement because the final finish and lubrication route affect friction, corrosion protection and assembly behavior.

Designation and ordering data

Clause 5 defines the designation using the diameter code, length code and drive code, with drive codes linked to ISO 14275 and ISO 14276. This is the order language for drawings, purchase orders and stock control, so the code must be copied correctly to avoid mixing sizes or drive variants.

Marking and product identification

Clause 6 requires marking in accordance with EN 2424 and Figure 1, with the style varying by diameter range. Marking supports traceability on the finished screw and helps avoid mix-ups during incoming inspection, storage and assembly.

Technical specification, approval and qualification

Clause 7 points to ISO 9152 for the technical specification and adds approval and qualification expectations. The manufacturer must be an approved production organization for aerospace products and maintain a quality management system such as EN 9100 or an equivalent accepted system. Qualification uses a procedure for aerospace standard products such as EN 9133, with tests documented unless otherwise agreed.

What terms does EN 4509:2026 define?

• Strength class 1 100 MPa - the minimum tensile strength of the material at ambient temperature.
• 315 °C - the maximum temperature the screw can withstand without continuous change in its original characteristics after return to ambient temperature.
• Offset cruciform recess - the internal drive form specified for the screw, with drive variants identified in Table 2.
• MJ threads - the aerospace metric thread form used for the screw and controlled by ISO 5855-2.
• Anodized - the surface condition applied to the titanium alloy screw as part of the required finish.
• Aluminium pigmented coating - the coating system required by EN 4473 for this fastener type.
• Approved production organization - a manufacturer recognized for aerospace production and able to maintain a suitable quality management system.

Who uses EN 4509:2026?

EN 4509:2026 is used by aerospace fastener manufacturers, procurement teams, design engineers, quality managers, inspection personnel and qualification laboratories. They use it to select the correct screw type, define the purchase description, verify dimensions and finish, and document manufacturer approval and product qualification. It is also relevant to organizations handling titanium fasteners, coating processes and aerospace assembly control.

Which standards are used with EN 4509:2026?

• EN 2424 - gives the marking rule for aerospace products.
• EN 4473 - specifies the aluminium pigmented organic coating used on the fastener.
• EN 6117 - specifies lubrication of fasteners with cetyl alcohol.
• ISO 3353-1 - covers lead and runout threads for rolled external threads.
• ISO 5855-2 - gives limit dimensions for MJ bolts and nuts.
• ISO 7913 - gives tolerances of form and position for metric aerospace bolts and screws.
• ISO 9152 - provides the procurement specification for strength class 1 100 MPa titanium-alloy MJ bolts and screws.
• ISO 14275 - covers ribbed offset cruciform internal drives.
• ISO 14276 - covers unribbed offset cruciform internal drives.
• TR 3775 - provides material information for aerospace bolts and pins.
• SAE AS87132 - gives an alternative cetyl alcohol lubricant specification.
• EN 9100 - is cited as an example of an acceptable aerospace quality management system.
• EN 9133 - is cited as an example of an aerospace standard-product qualification procedure.

What does the EN 4509:2026 document contain?

EN 4509:2026 contains Figure 1 for the screw configuration and Table 1 for dimensions, tolerances, thread codes, length coding and approximate mass. It also contains Table 2 for drive codes and Table 3 for marking.

Clause 5 gives a designation example that shows how the diameter code, length code and drive code are combined. Clause 7 sets out the technical specification route, including manufacturer approval and qualification expectations.

For design and procurement, the document provides the information needed to identify the correct screw variant. For testing and approval, it points to the referenced aerospace standards that control thread form, coating, lubrication, marking and quality system practice.

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
...