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

This European standard specifies the characteristics of screws, pan head, offset cruciform recess, coarse tolerance normal shank, long thread, in alloy steel, cadmium plated, for aerospace applications.
Classification: 1 100 MPa /235 °C .

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

Diese Europäische Norm legt die Merkmale von Flachkopfschrauben mit Flügelkreuzschlitz, grober Schafttoleranz, langem Gewinde, aus legiertem Stahl, kadmiert, für Anwendungen in der Luft  und Raumfahrt fest.
Klasse: 1 100 MPa /235 °C .

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

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

Aeronavtika - Vijaki, valjasta glava, križna zareza, široka toleranca, dolg navoj, iz legiranega jekla, kadmirani - Klasifikacija: 1100 MPa (pri temperaturi okolice)/235 °C

Ta dokument določa značilnosti vijakov: valjasta glava, križna zareza, široka toleranca, dolg navoj, iz legiranega jekla, prevlečeni s kadmijem.
Klasifikacija: 1100 MPa/235 °C.

General Information

Status
Published
Publication Date
17-Nov-2019
ICS
49.030.20 - Bolts, screws, studs
Technical Committee
I13 - Imaginarni 13
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
04-Nov-2019
Due Date
09-Jan-2020
Completion Date
18-Nov-2019
Ref Project
EN 4161:2019 - Aerospace series - Screws, pan head, offset cruciform recess, coarse tolerance normal shank, long thread, in alloy steel, cadmium plated - Classification: 1 100 PMa (at ambient temperature)/235 °C

Relations

Replaces
SIST EN 4161:2010/AC:2010 - Aerospace series - Screws, pan head, offset cruciform recess, coarse tolerance normal shank, long thread, in alloy steel, cadmium plated - Classification: 1100 MPa (at ambient temperature)/235 °C
Effective Date
30-Oct-2019
Replaces
SIST EN 4161:2010 - Aerospace series - Screws, pan head, offset cruciform recess, coarse tolerance normal shank, long thread, in alloy steel, cadmium plated - Classification: 1100 PMa (at ambient temperature)/235 °C
Effective Date
30-Oct-2019
Revised
SIST EN 4161:2010 - Aerospace series - Screws, pan head, offset cruciform recess, coarse tolerance normal shank, long thread, in alloy steel, cadmium plated - Classification: 1100 PMa (at ambient temperature)/235 °C
Effective Date
15-Feb-2017
Revised
SIST EN 4161:2010/AC:2010 - Aerospace series - Screws, pan head, offset cruciform recess, coarse tolerance normal shank, long thread, in alloy steel, cadmium plated - Classification: 1100 MPa (at ambient temperature)/235 °C
Effective Date
15-Feb-2017

Overview

EN 4161:2019 is a CEN aerospace standard that defines the characteristics and procurement requirements for pan head screws with offset cruciform recess (coarse tolerance normal shank, long thread) made from alloy steel and cadmium plated for aerospace use. The standard specifies mechanical classification 1 100 MPa (minimum tensile strength at ambient temperature) and a maximum service temperature of 235 °C determined by the surface treatment. EN 4161 replaces earlier editions and is intended for use across European national standards bodies.

Key topics and requirements

  • Material and strength
    • Alloy steel meeting EN 2137 / EN 2442 or ASD‑STAN/TR 3775 classification (minimum tensile strength 1 100 MPa).
  • Surface treatment
    • Cadmium plating in accordance with EN 2133. Required thickness 8 μm to 14 μm on surfaces contactable by a 20 mm diameter ball; continuous deposit on other surfaces. Black colour option available (code B).
  • Dimensions and tolerances
    • Dimensional configuration, masses and thread details are specified by figure/table references (dimensions in millimetres, after surface treatment).
    • Thread and lead/runout per ISO 3353-1; MJ thread limit dimensions per ISO 5855-2.
    • Form and positional tolerances per ISO 7913.
  • Drive types
    • Offset cruciform drives per ISO 14275 (R) and ISO 14276 (A) with defined drive codes.
  • Designation, marking and identification
    • Marking rules follow EN 2424; diameter and style codes are given for traceability.
  • Manufacturing, approval and qualification
    • Technical specification generally follows ISO 7689 with additional aerospace requirements:
      • Manufacturer must be an approved aerospace production organisation with a documented quality system (e.g., EN 9100).
      • Product qualification should follow established aerospace procedures (e.g., EN 9133) unless otherwise agreed.

Applications

EN 4161 screws are used where reliable, high‑strength fasteners with controlled corrosion protection are required in aerospace structures and systems. Typical users include:

  • Aircraft and spacecraft design engineers specifying fasteners for structural and secondary assemblies
  • Fastener manufacturers and suppliers producing cadmium‑plated alloy steel screws
  • Procurement, quality and certification teams ensuring compliance with aerospace purchasing specifications
  • Maintenance and overhaul organisations replacing parts to the correct aerospace standard

Related standards

  • EN 2133 (cadmium plating)
  • EN 2137 / EN 2442 (alloy steel bars)
  • ISO 3353-1, ISO 5855-2, ISO 7689, ISO 7913 (threads, tolerances, procurement)
  • ISO 14275 / ISO 14276 (drive types)
  • EN 2424 (marking)
  • EN 9100, EN 9133 (aerospace quality and qualification)

Keywords: EN 4161, aerospace screws, pan head, cadmium plated screws, alloy steel fasteners, offset cruciform recess, MJ threads, 1100 MPa, 235 °C.

Frequently Asked Questions

SIST EN 4161:2020 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Aerospace series - Screws, pan head, offset cruciform recess, coarse tolerance normal shank, long thread, in alloy steel, cadmium plated - Classification : 1 100 PMa (at ambient temperature) / 235 °C". This standard covers: This European standard specifies the characteristics of screws, pan head, offset cruciform recess, coarse tolerance normal shank, long thread, in alloy steel, cadmium plated, for aerospace applications. Classification: 1 100 MPa /235 °C .

This European standard specifies the characteristics of screws, pan head, offset cruciform recess, coarse tolerance normal shank, long thread, in alloy steel, cadmium plated, for aerospace applications. Classification: 1 100 MPa /235 °C .

SIST EN 4161:2020 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.

SIST EN 4161:2020 has the following relationships with other standards: It is inter standard links to SIST EN 4161:2010/AC:2010, SIST EN 4161:2010, SIST EN 4161:2010, SIST EN 4161:2010/AC:2010. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.

SIST EN 4161:2020 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-januar-2020
Nadomešča:
SIST EN 4161:2010
SIST EN 4161:2010/AC:2010
Aeronavtika - Vijaki, valjasta glava, križna zareza, široka toleranca, dolg navoj, iz
legiranega jekla, kadmirani - Klasifikacija: 1100 MPa (pri temperaturi okolice)/235
°C
Aerospace series - Screws, pan head, offset cruciform recess, coarse tolerance normal
shank, long thread, in alloy steel, cadmium plated - Classification : 1 100 PMa (at
ambient temperature) / 235 °C
Luft- und Raumfahrt - Flachkopfschrauben, mit Flügelkreuzschlitz, langes Gewinde, aus
legiertem Stahl, verkadmet - Klasse : 1 100 MPa (bei Raumtemperatur) / 235 °C
Série aérospatiale - Vis à tête cylindrique, 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 4161:2019
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 4161
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2019
EUROPÄISCHE NORM
ICS 49.030.20 Supersedes EN 4161:2009
English Version
Aerospace series - Screws, pan head, offset cruciform
recess, coarse tolerance normal shank, long thread, in alloy
steel, cadmium plated - Classification: 1 100 PMa (at
ambient temperature)/235 °C
Série aérospatiale - Vis à tête cylindrique, à empreinte Luft- und Raumfahrt - Flachkopfschrauben, mit
cruciforme déportée, tige normale à tolérance large, Flügelkreuzschlitz, grobe Schafttoleranz, langes
filetage long, en acier allié, cadmiées - Classification : 1 Gewinde, aus legiertem Stahl, verkadmet - Klasse: 1
100 MPa (à température ambiante)/235 °C 100 MPa (bei Raumtemperatur)/235 °C
This European Standard was approved by CEN on 1 March 2019.

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
© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 4161:2019 E
worldwide for CEN national Members.

Contents
Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 5
4 Required characteristics . 5
5 Designation. 8
6 Marking . 8
7 Technical specification . 8
Bibliography . 9

European foreword
This document (EN 4161:2019) 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 April 2020, and conflicting national standards shall be
withdrawn at the latest by April 2020.
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 4161:2009, EN 4161/AC:2010.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to implement this European Standard: 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 the
United Kingdom.
SIST EN 4161
...

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