EN 2939:2024

Aerospace series - Screw, 100° countersunk head, offset cruciform recess, threaded to head, in heat resisting steel FE-PA92HT (A286) - Classification: 900 MPa (at ambient temperature)/650 °C

This document specifies the characteristics of screws with 100° countersunk head, offset cruciform recess, threaded to head, in FE-PA92HT, for aerospace applications.
Classification: 900 MPa /650 °C .

Luft- und Raumfahrt - 100° Senkschraube, Flügelkreuzschlitz, Gewinde bis Kopf, aus hochwarmfestem Stahl FE-PA92HT (A286) - Klasse: 900 MPa (bei Raumtemperatur)/650 °C

Dieses Dokument legt die Eigenschaften von 100° Senkschrauben mit Flügelkreuzschlitz und Gewinde bis Kopf, aus FE PA92HT, zur Verwendung in der Luft- und Raumfahrt fest.
Klasse: 900 MPa /650 °C .

Série aérospatiale - Vis à tête fraisée 100°, empreinte cruciforme déportée, filetée jusqu'à proximité de la tête, en acier résistant à chaud FE-PA92HT (A286) - Classification : 900 MPa (à température ambiante)/650 °C

Le présent document spécifie les caractéristiques des vis à tête fraisée 100°, à empreinte cruciforme déportée, filetées jusqu'à proximité de la tête, en FE-PA92HT, pour les applications aérospatiales.
Classification : 900 MPa /650 °C.

Aeronavtika - Vijak, 100° ugrezna glava, križna zareza, z navojem do glave, iz toplotno odpornega jekla FE-PA92HT (A286) - Klasifikacija: 900 MPa (pri okoljski temperaturi)/650 °C

Ta dokument določa značilnosti vijakov z ugrezno glavo 100°, križno zarezo, za navojem do glave iz toplotno odpornega jekla FE-PA92HT za uporabo v aeronavtiki.
Klasifikacija: 900 MPa/650 °C.

General Information

• Status: Published
• Publication Date: 12-Mar-2024
• 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: 13-Mar-2024
• Completion Date: 13-Mar-2024
• Ref Project: SIST EN 2939:2024 - Aerospace series - Screw, 100° countersunk head, offset cruciform recess, threaded to head, in heat resisting steel FE-PA92HT (A286) - Classification: 900 MPa (at ambient temperature)/650 °C

Relations

• Replaces: EN 2939:1994 - Aerospace series - Screws, 100° countersunk head, offset cruciform recess, threaded to head, in heat resisting steel FE-PA92HT (A286) - Classification: 900 MPa (at ambient temperature) / 650 °C
• Effective Date: 04-Feb-2015

Overview

EN 2939:2024 is a CEN (ASD‑STAN) aerospace standard that specifies the characteristics of a high‑temperature screw: 100° countersunk head, offset cruciform recess, threaded to head, manufactured in heat‑resisting steel FE‑PA92HT (A286). The screw is classified 900 MPa (minimum tensile strength at ambient temperature) / 650 °C (maximum test temperature). This edition (2024) supersedes EN 2939:1994 and updates normative references, adds terms and definitions, and introduces a drive code in the designation rules.

Key topics and technical requirements

• Material: Screws must be made from FE‑PA92HT per EN 2398 or EN 2399 (A286 type heat‑resisting steel).
• Mechanical classification: Minimum tensile strength 900 MPa at ambient temperature; parts are suitable for use up to 650 °C test temperature.
• Geometry & dimensions: Configuration, dimensions, tolerances and masses are defined (see Figure 1 and Tables 1–2). Thread codes / sizes include MJ3, MJ4, MJ5 series (per ISO 5855‑2 and ISO 3353‑1).
• Drive and recess: Offset cruciform recess per ISO 14275 (and ISO 14276 where applicable). Drive codes are specified for designation.
• Threading: Threads conform to aerospace lead/runout and MJ thread standards (ISO 3353‑1, ISO 5855‑2).
• Marking & identification: Marking style follows EN 2424 (specific styles by diameter code). Designation rules allow optional insertion of code I9005.
• Surface/finish: Sharp edges removal (0.1 to 0.4 mm) and other production details are required; technical specification references EN 3043 for manufacturing and inspection details.
• Normative references: The document cites EN 2398/2399 (materials), EN 2424 (marking), EN 3043 (technical specification) and relevant ISO drive/thread standards.

Practical applications and users

EN 2939:2024 is intended for aerospace design, manufacturing and procurement where high‑temperature, high‑strength countersunk fasteners are required. Typical users:

• Aerospace fastener manufacturers and heat‑treatment shops
• Aircraft structural designers and OEMs specifying fastener requirements
• Procurement and quality assurance teams responsible for parts acceptance
• Maintenance, repair and overhaul (MRO) organizations handling replacement hardware
• Certification bodies and test laboratories validating compliance with aerospace material and performance requirements

Using EN 2939:2024 ensures interoperability, traceability and consistent performance for FE‑PA92HT (A286) countersunk screws in high‑temperature aerospace environments.

Related standards

• EN 2398 / EN 2399 - FE‑PA material specifications
• EN 3043 - Technical specification for FE‑PA92HT fasteners
• EN 2424 - Marking of aerospace products
• ISO 3353‑1, ISO 5855‑2 - Thread and MJ thread dimensions
• ISO 14275 / ISO 14276 - Offset cruciform drives

Keywords: EN 2939:2024, aerospace screw, 100° countersunk head, FE‑PA92HT, A286, 900 MPa, 650 °C, offset cruciform recess, threaded to head, fastener standard.

Standards Content (Sample)

SLOVENSKI STANDARD
01-maj-2024
Nadomešča:
SIST EN 2939:2001
Aeronavtika - Vijak, 100° ugrezna glava, križna zareza, z navojem do glave, iz
toplotno odpornega jekla FE-PA92HT (A286) - Klasifikacija: 900 MPa (pri okoljski
temperaturi)/650 °C
Aerospace series - Screw, 100° countersunk head, offset cruciform recess, threaded to
head, in heat resisting steel FE-PA92HT (A286) - Classification: 900 MPa (at ambient
temperature)/650 °C
Luft- und Raumfahrt - 100° Senkschraube, Flügelkreuzschlitz, Gewinde bis Kopf, aus
hochwarmfestem Stahl FE-PA92HT (A286) - Klasse: 900 MPa (bei
Raumtemperatur)/650 °C
Série aérospatiale - Vis à tête fraisée 100°, empreinte cruciforme déportée, filetée
jusqu'à proximité de la tête, en acier résistant à chaud FE-PA92HT (A286) -
Classification : 900 MPa (à température ambiante)/650 °C
Ta slovenski standard je istoveten z: EN 2939:2024
ICS:
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 2939
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2024
EUROPÄISCHE NORM
ICS 49.030.20 Supersedes EN 2939:1994
English Version
Aerospace series - Screw, 100° countersunk head, offset
cruciform recess, threaded to head, in heat resisting steel
FE-PA92HT (A286) - Classification: 900 MPa (at ambient
temperature)/650 °C
Série aérospatiale - Vis à tête fraisée 100°, empreinte Luft- und Raumfahrt - 100° Senkschraube,
cruciforme déportée, filetée jusqu'à proximité de la Flügelkreuzschlitz, Gewinde bis Kopf, aus
tête, en acier résistant à chaud FE-PA92HT (A286) - hochwarmfestem Stahl FE-PA92HT (A286) - Klasse:
Classification : 900 MPa (à température ambiante)/650 900 MPa (bei Raumtemperatur)/650 °C
°C
This European Standard was approved by CEN on 29 January 2024.

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
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 2939:2024 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 . 4
4.1 Configuration — Dimensions — Tolerances — Masses . 4
4.2 Materials . 5
5 Designation . 7
6 Marking . 8
7 Technical specification . 8

European foreword
This document (EN 2939:2024) 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 September 2024, and conflicting national standards
shall be withdrawn at the latest by September 2024.
Attention is drawn to the possibil
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