SIST EN 4844:2022
(Main)Aerospace series - Screws, 100° countersunk normal head, Spiral Drive Recess, threaded to head, in heat and corrosion resisting steel, passivated - Classification : 1 100 MPa (at ambient temperature) / 425 °C
Aerospace series - Screws, 100° countersunk normal head, Spiral Drive Recess, threaded to head, in heat and corrosion resisting steel, passivated - Classification : 1 100 MPa (at ambient temperature) / 425 °C
This document specifies the characteristics of externally threaded fasteners, 100° countersunk normal
head, Spiral Drive Recess, threaded to head, in heat and corrosion resisting steel, passivated, for
aerospace applications.
Luft und Raumfahrt - 100° Senkschrauben mit Spiral Antrieb, Gewinde annähernd bis Kopf, aus korrosionsbeständigem und hochwarmfestem Stahl, passiviert - Klasse: 1 100 MPa (bei Raumtemperatur)/425 °C
Dieses Dokument legt die Eigenschaften von Verbindungselementen mit Außengewinde, 100° Senkkopfschraube, Spiral-Antrieb, Gewinde annähernd bis Kopf, aus korrosionsbeständigem und hochwarmfestem Stahl, passiviert, für Luft- und Raumfahrtanwendungen fest.
Série aérospatiale - Vis à tête fraisée normale 100°, empreinte en spirale, filetée jusqu'à proximité de la tête, en acier résistant à chaud et à la corrosion, passivée - Classification : 1 100 MPa (à température ambiante)/425 °C
Aeronavtika - Vijaki, 100° ugrezna glava, spiralna vdolbina, z navojem do glave, iz toplotno in korozijsko odpornega jekla, pasivirani - Klasifikacija: 1100 MPa (pri temperaturi okolice)/425 °C
Ta dokument določa značilnosti zunanjih navojnih veznih elementov – 100° ugrezna glava, spiralna vdolbina, z navojem do glave, iz toplotno in korozijsko odpornega jekla, pasiviranih – za uporabo v aeronavtiki.
General Information
- Status
- Published
- Publication Date
- 05-Apr-2022
- Technical Committee
- I13 - Imaginarni 13
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 30-Mar-2022
- Due Date
- 04-Jun-2022
- Completion Date
- 06-Apr-2022
Relations
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
Overview
SIST EN 4844:2022 specifies the requirements and characteristics for externally threaded fasteners used in aerospace applications. These are screws with a 100° countersunk normal head, integrated Spiral Drive Recess, and threading extending up to the head. Manufactured from heat and corrosion resisting steel, these aerospace screws are passivated and classified for critical performance standards - specifically, a minimum tensile strength of 1,100 MPa at ambient temperature and operational capability up to 425 °C.
This standard, maintained by the Slovenian Institute for Standardization (SIST) and harmonized as EN 4844:2022, ensures compatibility, safety, and reliability for fastening solutions in the aerospace industry.
Key Topics
- Screw Configuration: 100° countersunk normal head, Spiral Drive Recess (Mortorq® compatible or equivalent), threaded to head, meeting strict geometrical and technical requirements.
- Material Specifications: Heat and corrosion resisting steel, prepared according to defined metallurgical standards (EN 3761), ensuring high strength and durability.
- Surface Treatment: Mandatory passivation per EN 2516, improving corrosion resistance, critical for aerospace environments.
- Dimensional and Form Tolerances: All dimensions and tolerances post-treatment specified precisely to maintain interchangeability and compliance with international aerospace standards.
- Marking and Identification: Specific guidelines for indented marking, following EN 2424 for traceability and drive code designation per EN 4609.
- Quality Management: Compliant manufacturers must maintain an approved quality management system (e.g., EN 9100) and follow established qualification procedures for aerospace standard products.
Applications
Adopting SIST EN 4844:2022 is essential for a range of aerospace projects to ensure safety, reliability, and interoperability:
- Aircraft Structures: Used for primary and secondary structural connections requiring high tensile strength and resistance to extreme environments.
- Engine Attachments: Suitable for fasteners exposed to elevated temperatures, up to 425 °C, fundamental in engine assembly and maintenance.
- Spacecraft and Defense Systems: Delivers dependable fastening for critical systems where vibration, thermal cycling, and corrosion resistance are vital.
- Maintenance, Repair, and Overhaul (MRO): Ensures consistent quality and traceability for replacement parts and repairs, supporting airworthiness requirements.
By implementing these standardized screws, aerospace organizations benefit from robust and consistent performance, simplified supply chain management, and compliance with international regulations.
Related Standards
For comprehensive application and compliance in aerospace fasteners, the following standards are closely related and often referenced within SIST EN 4844:2022:
- EN 2424 – Marking of Aerospace Products
- EN 2516 – Passivation of Corrosion Resisting Steels
- EN 3761 – Heat Resisting Alloy Specifications for Forged Fasteners
- EN 4609 – Spiral Drive Recesses for Threaded Fasteners
- ISO 3353-1 – Aerospace Rolled External Threads
- ISO 5855-2 – MJ Threads: Limit Dimensions for Bolts and Nuts
- ISO 7913 – Tolerances of Form and Position for Bolts and Screws
- ISO 8168 – Procurement Specification for Heat and Corrosion Resisting Steel Bolts
- EN 9100 – Aerospace Quality Management Systems
- EN 9133 – Qualification Procedures for Aerospace Standard Products
Organizations utilizing SIST EN 4844:2022 ensure their fastener solutions meet stringent aerospace safety, interoperability, and performance benchmarks for both current and future aircraft developments.
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Frequently Asked Questions
SIST EN 4844:2022 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Aerospace series - Screws, 100° countersunk normal head, Spiral Drive Recess, threaded to head, in heat and corrosion resisting steel, passivated - Classification : 1 100 MPa (at ambient temperature) / 425 °C". This standard covers: This document specifies the characteristics of externally threaded fasteners, 100° countersunk normal head, Spiral Drive Recess, threaded to head, in heat and corrosion resisting steel, passivated, for aerospace applications.
This document specifies the characteristics of externally threaded fasteners, 100° countersunk normal head, Spiral Drive Recess, threaded to head, in heat and corrosion resisting steel, passivated, for aerospace applications.
SIST EN 4844:2022 is classified under the following ICS (International Classification for Standards) categories: 49.025.10 - Steels; 49.030.20 - Bolts, screws, studs. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN 4844:2022 has the following relationships with other standards: It is inter standard links to SIST EN 4609:2020, SIST EN 3761:2020, SIST EN 840-6:2004+A1:2008, SIST EN 2516:2024, SIST EN 2424:2008, SIST EN 14460:2006. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
SIST EN 4844:2022 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
SLOVENSKI STANDARD
01-maj-2022
Aeronavtika - Vijaki, 100° ugrezna glava, spiralna vdolbina, z navojem do glave, iz
toplotno in korozijsko odpornega jekla, pasivirani - Klasifikacija: 1100 MPa (pri
temperaturi okolice)/425 °C
Aerospace series - Screws, 100° countersunk normal head, Spiral Drive Recess,
threaded to head, in heat and corrosion resisting steel, passivated - Classification : 1 100
MPa (at ambient temperature) / 425 °C
Luft und Raumfahrt - 100° Senkschrauben mit Spiral Antrieb, Gewinde annähernd bis
Kopf, aus korrosionsbeständigem und hochwarmfestem Stahl, passiviert - Klasse: 1 100
MPa (bei Raumtemperatur)/425 °C
Série aérospatiale - Vis à tête fraisée normale 100°, empreinte en spirale, filetée jusqu'à
proximité de la tête, en acier résistant à chaud et à la corrosion, passivée - Classification
: 1 100 MPa (à température ambiante)/425 °C
Ta slovenski standard je istoveten z: EN 4844:2022
ICS:
49.025.10 Jekla Steels
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 4844
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2022
EUROPÄISCHE NORM
ICS 49.030.20
English Version
Aerospace series - Screws, 100° countersunk normal head,
Spiral Drive Recess, threaded to head, in heat and
corrosion resisting steel, passivated - Classification : 1 100
MPa (at ambient temperature) / 425 °C
Série aérospatiale - Vis à tête fraisée normale 100°, Luft und Raumfahrt - 100° Senkschrauben mit Spiral
empreinte en spirale, filetée jusqu'à proximité de la Antrieb, Gewinde annähernd bis Kopf, aus
tête, en acier résistant à chaud et à la corrosion, korrosionsbeständigem und hochwarmfestem Stahl,
passivée - Classification : 1 100 MPa (à température passiviert - Klasse: 1 100 MPa (bei
ambiante)/425 °C Raumtemperatur)/425 °C
This European Standard was approved by CEN on 10 January 2022.
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, Turkey 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
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 4844:2022 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Requirements . 6
4.1 Configuration — Dimensions — Masses . 6
4.2 Tolerances of form and position . 8
4.3 Materials . 8
4.4 Surface treatment . 8
5 Designation . 8
6 Marking . 8
7 Technical specification . 9
Bibliography. 10
European foreword
This document (EN 4844:2022) 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 September 2022, and conflicting national standards shall
be withdrawn at the latest by September 2022.
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.
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, Croatia,
Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands,
Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
the United Kingdom.
Introduction
Aerospace and Defence Standardisation (ASD-STAN) draws attention to the fact that it is claimed that
compliance with this document may involve the use of a pa
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