EN 4163:2026

Aerospace series - Screws 100° countersunk normal head, offset cruciform recess, coarse tolerance normal shank, long thread, in alloy steel, cadmium plated - Classification: 1 100 MPa (at ambient temperature) / 235 °C

This document specifies the characteristics of screws, 100° countersunk normal head, offset cruciform recess, coarse tolerance normal shank, long thread, in alloy steel, cadmium plated.
Classification: 1 100 MPa1/235 °C2.

Luft- und Raumfahrt - 100° Senkschrauben mit Flügelkreuzschlitz, langes Gewinde, aus legiertem Stahl, verkadmet - Klasse: 1 100 MPa (bei Raumtemperatur)/235 °C

Série aérospatiale - Vis à tête fraisée 100° normale, à empreinte cruciforme déportée, tige normale à tolérance large, filetage long, en acier allié, cadmiée - Classification : 1 100 MPa (à température ambiante)/235 °C

Le présent document spécifie les caractéristiques des vis à tête fraisée 100° normale, à empreinte cruciforme déportée, tige normale à tolérance large, filetage long, en acier allié, cadmiées.
Classification : 1 100 MPa1/235 °C.

Aeronavtika - Vijaki, 100° ugrezna glava, križna zareza, polno steblo, ozka toleranca, dolg navoj, iz legiranega jekla, prevlečeni s kadmijem - Klasifikacija: 1100 MPa (pri temperaturi okolice)/235 °C

Ta dokument določa lastnosti vijakov s 100° vgreznjeno normalno glavo, zamaknjenim križnim utorom, grobo toleranco normalnega stebla, dolgim navojem, iz legiranega jekla, prevlečenih s kadmijem.
Razvrstitev: 1 100 MPa1/235 °C2.

General Information

• Status: Published
• Publication Date: 03-Mar-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: 04-Mar-2026
• Completion Date: 04-Mar-2026
• Ref Project: SIST EN 4163:2026 - Aerospace series - Screws 100° countersunk normal head, offset cruciform recess, coarse tolerance normal shank, long thread, in alloy steel, cadmium plated - Classification: 1 100 MPa (at ambient temperature) / 235 °C

Relations

• Replaces: EN 4163:2016 - Aerospace series - Screws 100° countersunk normal head, offset cruciform recess, coarse tolerance normal shank, long thread, in alloy steel, cadmium plated - Classification: 1 100 MPa (at ambient temperature) / 235 °C
• Effective Date: 30-Oct-2024
• Referred By: EN ISO 26101-2:2024 - Acoustics - Test methods for the qualification of the acoustic environment - Part 2: Determination of the environmental correction (ISO 26101-2:2024)
• Effective Date: 28-Jan-2026

Overview

EN 4163:2026, published by the European Committee for Standardization (CEN), defines the technical and quality requirements for 100° countersunk screws with a normal head, offset cruciform recess, coarse tolerance normal shank, and long thread, made from alloy steel and cadmium plated. These screws are classified for performance at a minimum tensile strength of 1 100 MPa at ambient temperature and suitability for use at temperatures up to 235 °C. The standard is a key reference within the aerospace sector, ensuring reliable fastening solutions for demanding environments.

This edition (2026) supersedes EN 4163:2016 and includes updated normative references, revised configurations, updated surface treatment provisions, and enhanced guidance on marking and drive codes.

Key Topics

• Screw Characteristics:

  • 100° countersunk normal head for streamlined assembly and reduced aerodynamic resistance
  • Offset cruciform recess enhances torque transfer and tool engagement
  • Coarse tolerance normal shank and long thread design for robust fastening
  • Manufactured from alloy steel, with cadmium plating for corrosion resistance

• Classification:

  • Minimum tensile strength: 1 100 MPa at ambient temperature
  • Operating temperature: up to 235 °C

• Surface Treatment:

  • Cadmium plating in accordance with EN 2133, 8 µm to 14 µm thickness
  • Option for black colour coding (code B)

• Compliance and Marking:

  • Marked according to EN 2424
  • Drive codes as per ISO 14275 (R) and ISO 14276 (A)

• Dimensions and Tolerances:

  • Dimensional tolerances in line with ISO 7913
  • Metric threads in accordance with ISO 5855-2 and ISO 3353-1

• Quality Assurance:

  • Manufacturers must operate under an approved aerospace quality management system (e.g., EN 9100)
  • Qualification and traceability based on EN 9133, with documented testing and approval procedures

Applications

EN 4163:2026 screws are engineered for critical aerospace fastening applications where high mechanical strength, resistance to high temperatures, and reliable long-term performance are necessary. Typical uses include:

• Airframes and Aircraft Structures: High-strength fasteners for panels, structural assemblies, and access covers
• Aerospace Equipment and Subsystems: Reliable attachment of components exposed to vibration, temperature variations, and corrosive environments
• Military and Commercial Aviation: Suitable for use in pressurized cabins and external skin where flush mounting and secure engagement are required
• Spacecraft and Avionics: The robust properties and stringent marking/qualification support traceability and mission assurance

By adhering to this standard, manufacturers and operators ensure compatibility, performance, and safety in aircraft and aerospace projects.

Related Standards

EN 4163:2026 is part of a broader framework of aerospace fastener and material standards, including:

• EN 2133 – Cadmium plating of steels, copper, and nickel alloys
• EN 2137 – Alloy steel bars used for aerospace fasteners
• EN 2424 – Marking of aerospace products
• ISO 3353-1 – Rolled external threads for aerospace
• ISO 5855-2 – MJ thread limit dimensions
• ISO 7689 – Procurement specification for alloy steel fasteners
• ISO 7913 – Metric screw form and position tolerances
• ISO 14275 & ISO 14276 – Offset cruciform internal drives
• EN 9100 – Quality management for aviation, space, and defence
• EN 9133 – Qualification procedures for aerospace standard products

Using EN 4163:2026 with these directly related standards guarantees high-performance, safety, and global consistency in aerospace fastening solutions.

Standards Content (Sample)

SLOVENSKI STANDARD
01-maj-2026
Aeronavtika - Vijaki, 100° ugrezna glava, križna zareza, polno steblo, ozka
toleranca, dolg navoj, iz legiranega jekla, prevlečeni s kadmijem - Klasifikacija:
1100 MPa (pri temperaturi okolice)/235 °C
Aerospace series - Screws 100° countersunk normal head, offset cruciform recess,
coarse tolerance normal shank, long thread, in alloy steel, cadmium plated -
Classification: 1 100 MPa (at ambient temperature) / 235 °C
Luft- und Raumfahrt - 100° Senkschrauben mit Flügelkreuzschlitz, langes Gewinde, aus
legiertem Stahl, verkadmet - Klasse: 1 100 MPa (bei Raumtemperatur)/235 °C
Série aérospatiale - Vis à tête fraisée 100° normale, à empreinte cruciforme déportée,
tige normale à tolérance large, filetage long, en acier allié, cadmiées - Classification: 1
100 MPa (à température ambiante)/235 °C
Ta slovenski standard je istoveten z: EN 4163:2026
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 4163
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2026
EUROPÄISCHE NORM
ICS 49.030.20 Supersedes EN 4163:2016
English Version
Aerospace series - Screws 100° countersunk normal head,
offset cruciform recess, coarse tolerance normal shank,
long thread, in alloy steel, cadmium plated - Classification:
1 100 MPa (at ambient temperature) / 235 °C
Série aérospatiale - Vis à tête fraisée 100° normale, à Luft- und Raumfahrt - 100° Senkschrauben mit
empreinte cruciforme déportée, tige normale à Flügelkreuzschlitz, langes Gewinde, aus legiertem
tolérance large, filetage long, en acier allié, cadmiée - Stahl, verkadmet - Klasse: 1 100 MPa (bei
Classification : 1 100 MPa (à température Raumtemperatur)/235 °C
ambiante)/235 °C
This European Standard was approved by CEN on 2 February 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 4163:2026 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 — Masses . 5
4.2 Tolerances of form and position . 5
4.3 Materials . 5
4.4 Surface treatment . 5
5 Designation . 7
6 Marking . 7
7 Technical specification . 7
7.1 General. 7
7.2 Approval of manufacturers . 7
7.3 Qualification of screws . 7
Bibliography . 8

European foreword
This document (EN 4163:2026) 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 September 2026, and conflicting national standards
shall be withdrawn at the latest by September 2026.
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.
This document supersedes EN 4163:2016.
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