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: 1 100 MPa (pri temperaturi okolice)/235 °C

General Information

Status
Not 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
5060 - Closure of Vote - Formal Approval
Start Date
01-Jan-2026
Completion Date
01-Jan-2026
Ref Project
kSIST FprEN 4163:2025 - 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

Revises
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

Overview

The FprEN 4163 standard, published by CEN, specifies detailed requirements for aerospace screws featuring a 100° countersunk normal head with an offset cruciform recess. These screws are manufactured from alloy steel with a cadmium plating finish, designed for high strength and temperature resistance. Classified as 1 100 MPa at ambient temperature and suitable for use up to 235 °C, these components meet stringent quality and performance criteria essential in aerospace applications.

This standard supersedes EN 4163:2016 and introduces updated normative references, surface treatments, and technical specifications that align with the latest aerospace manufacturing and safety requirements.

Key Topics

  • Screw Configuration & Dimensions
    The screws have a 100° countersunk head designed for flush mounting, with coarse tolerance normal shank and a long thread length. Dimensional tolerances comply with ISO 7913 and ISO 3353-1 for rolled external threads, ensuring consistency and compatibility with aerospace assemblies.

  • Materials & Strength
    Material selection is limited to alloy steel meeting a minimum tensile strength of 1 100 MPa, conforming to EN 2137 and TR 3775 standards. This ensures that screws maintain structural integrity under mechanical stresses typical of aerospace environments.

  • Surface Treatment
    Screws are cadmium plated, following EN 2133, with a coating thickness between 8 µm to 14 µm. This treatment offers corrosion resistance vital for aerospace durability. A black color option is also available as per customer requirements.

  • Drive and Marking
    The offset cruciform recess drive complies with ISO 14275 or ISO 14276 standards, allowing reliable torque application and assembly efficiency. Marking follows EN 2424 style B, ensuring clear identification and traceability.

  • Manufacturer Approval & Quality
    Manufacturers must be certified under aerospace quality management systems like EN 9100. The qualification process follows aerospace standards such as EN 9133, guaranteeing that screws meet all mechanical and dimensional specifications.

Applications

The FprEN 4163 standard screws are primarily intended for aerospace industry applications, where high-reliability fasteners are critical. Typical uses include:

  • Aircraft structural assemblies requiring flush fastening solutions.
  • Components exposed to moderate temperatures up to 235 °C.
  • Aerospace systems where resistance to corrosion, vibration, and mechanical fatigue is crucial.
  • Environments demanding precise thread forms, lengths, and strong mechanical properties.

These screws ensure secure and resilient joints in airframes, engine components, and critical aerospace infrastructure, supporting safety and performance in demanding conditions.

Related Standards

  • EN 2133 - Cadmium plating requirements for aerospace steel components
  • EN 2137 - Specifications for alloy steel bars with tensile strength between 1 100 MPa and 1 250 MPa
  • ISO 7913 - Tolerances of form and position for metric aerospace bolts and screws
  • ISO 3353-1 - Standards for rolled external threads used in aerospace fasteners
  • ISO 14275 & ISO 14276 - Drive design for internal offset cruciform recesses in aerospace screws
  • EN 2424 - Marking standards for aerospace products
  • EN 9100 - Quality management systems for aviation, space, and defense organizations
  • EN 9133 - Qualification procedures for aerospace standard products

Keywords: aerospace screws standard, 100° countersunk screws, offset cruciform recess, alloy steel screws, cadmium plated aerospace fasteners, aerospace bolt tolerances, aerospace screw classification, aerospace quality management system, EN 4163 replacement, high tensile aerospace screws.

Frequently Asked Questions

FprEN 4163 is a draft published by the European Committee for Standardization (CEN). Its full title is "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 standard covers: 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.

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.

FprEN 4163 is classified under the following ICS (International Classification for Standards) categories: 49.030.20 - Bolts, screws, studs. The ICS classification helps identify the subject area and facilitates finding related standards.

FprEN 4163 has the following relationships with other standards: It is inter standard links to EN 4163:2016. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.

FprEN 4163 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
oSIST prEN 4163:2025
01-januar-2025
Aeronavtika - Vijaki, 100° ugrezna glava, križna zareza, polno steblo, ozka
toleranca, dolg navoj, iz legiranega jekla, prevlečeni s kadmijem - Klasifikacija: 1
100 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: prEN 4163
ICS:
49.025.10 Jekla Steels
49.030.20 Sorniki, vijaki, stebelni vijaki Bolts, screws, studs
oSIST prEN 4163:2025 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST prEN 4163:2025
oSIST prEN 4163:2025
DRAFT
EUROPEAN STANDARD
prEN 4163
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2024
ICS 49.030.20 Will supersede 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, cadmiées - Stahl, verkadmet - Klasse: 1 100 MPa (bei
Classification: 1 100 MPa (à température Raumtemperatur)/235 °C
ambiante)/235 °C
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee ASD-
STAN.
If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.

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. prEN 4163:2024 E
worldwide for CEN national Members.

oSIST prEN 4163:2025
prEN 4163:2024 (E)
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 – Masses . 4
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

oSIST prEN 4163:2025
prEN 4163:2024 (E)
European foreword
This document (prEN 4163
...

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