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

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

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

Diese Europäische Norm legt die Eigenschaften von Flachkopfschrauben mit Flügelkreuzschlitz und mittlerer Gewindelänge aus legiertem Stahl, verkadmet, fest.
Klasse: 1 100 MPa )/235 °C )

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

Cette Norme Européenne spécifie les caractéristiques des vis à tête cylindrique, à empreinte cruciforme déportée, tige normale à tolérance large, filetage moyen, en acier allié, cadmiées.
Classification : 1 100 MPa  1) / 235 °C  2).

Aeronavtika - Vijaki, valjasta glava, križna zareza, široka toleranca, srednja navojna dolžina, iz legiranega jekla, prevlečeni s kadmijem - Klasifikacija: 1100 MPa (pri temperaturi okolice)/235 °C

Ta standard določa značilnosti vijakov: valjasta glava, križna zareza, široka toleranca, srednja navojna dolžina, iz legiranega jekla, prevlečenega s kadmijem.
Klasifikacija: 1100 MPa 1)/235 °C).

General Information

Status
Published
Publication Date
29-Mar-2016
Withdrawal Date
29-Sep-2016
ICS
49.030.20 - Bolts, screws, studs
Technical Committee
ASD-STAN - Aerospace
Drafting Committee
ASD-STAN/D 3 - Mechanical
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Start Date
30-Mar-2016
Completion Date
30-Mar-2016
Ref Project
SIST EN 4138:2016 - Aerospace series - Screws, pan head, offset cruciform recess, coarse tolerance normal shank, medium length thread, in alloy steel, cadmium plated - Classification: 1 100 MPa (at ambient temperature) / 235 °C

Relations

Replaces
EN 4138:2009 - Aerospace series - Screws, pan head, offset cruciform recess, coarse tolerance normal shank, medium length thread, in alloy steel, cadmium plated - Classification : 1 100 MPa (at ambient temperature) / 235 °C
Effective Date
06-Apr-2016
Refers
EN 16306:2013 - Natural stone test methods - Determination of resistance of marble to thermal and moisture cycles
Effective Date
28-Jan-2026
Refers
EN 9133:2018 - Aerospace series - Quality Management Systems - Qualification Procedure for Aerospace Standard Products
Effective Date
28-Jan-2026
Refers
EN ISO 17855-1:2014 - Plastics - Polyethylene (PE) moulding and extrusion materials - Part 1: Designation system and basis for specifications (ISO 17855-1:2014)
Effective Date
28-Jan-2026
Referred By
EN 868-3:2009 - Packaging for terminally sterilized medical devices - Part 3: Paper for use in the manufacture of paper bags (specified in EN 868-4) and in the manufacture of pouches and reels (specified in EN 868-5) - Requirements and test methods
Effective Date
28-Jan-2026
Referred By
EN 868-6:2009 - Packaging for terminally sterilized medical devices - Part 6: Paper for low temperature sterilization processes - Requirements and test methods
Effective Date
28-Jan-2026
Referred By
EN 868-2:2009 - Packaging for terminally sterilized medical devices - Part 2: Sterilization wrap - Requirements and test methods
Effective Date
28-Jan-2026
Referred By
EN 868-7:2009 - Packaging for terminally sterilized medical devices - Part 7: Adhesive coated paper for low temperature sterilization processes - Requirements and test methods
Effective Date
28-Jan-2026
Referred By
EN 868-4:2009 - Packaging for terminally sterilized medical devices - Part 4: Paper bags - Requirements and test methods
Effective Date
28-Jan-2026

Overview

EN 4138:2016 is a European standard developed by the Aerospace and Defence Industries Association of Europe (ASD-STAN) under the CEN framework. It specifies the characteristics of aerospace-quality screws featuring pan heads, offset cruciform recesses, coarse tolerance normal shanks, and medium length threads. These screws are manufactured from alloy steel and are cadmium plated. The standard ensures mechanical performance with a tensile strength classification of 1100 MPa at ambient temperature and temperature resistance up to 235 °C.

This standard is essential for aerospace applications requiring high-strength, corrosion-resistant fasteners that meet stringent quality and dimensional requirements. EN 4138:2016 supersedes the previous version EN 4138:2009 and aligns with related aerospace standards for material, thread, and surface treatment.

Key Topics

  • Screw Type and Configuration

    • Pan head design
    • Offset cruciform recess drive type
    • Coarse tolerance normal shank
    • Medium length thread according to aerospace specifications

  • Material and Mechanical Properties

    • Alloy steel composition with specified strength of 1100 MPa
    • Cadmium plating thickness from 8 µm to 14 µm for corrosion protection
    • Performance verified at ambient temperature and sustained up to 235 °C

  • Dimensional Requirements and Tolerances

    • Defined according to ISO 5855-2 and ISO 3353-1 for thread limits and lead
    • Form and positional tolerances per ISO 7913
    • Detailed size codes for diameter and length to ensure interchangeability

  • Marking and Identification

    • Marking requirements in line with EN 2424 for traceability
    • Use of hole and drive codes for concise screw designation

  • Manufacturing and Quality Assurance

    • Manufacturer approval compliant with EN 9100 quality management standards
    • Screws qualified under EN 9133 procedures
    • Normative references supporting materials and surface treatments including EN 2133 and EN 2137

Applications

EN 4138:2016 screws are tailored for aerospace and defense industry applications where fastener reliability under mechanical load and environmental exposure is critical. Their features support:

  • Aircraft assembly and maintenance requiring durable, corrosion-resistant fasteners
  • Structural fastening where medium thread length is optimal for load distribution
  • Situations demanding screws capable of withstanding temperatures up to 235 °C without loss of mechanical integrity
  • Use in highly regulated aerospace supply chains needing traceability and standardized quality

These screws also find use in high-performance vehicles and precision engineering sectors where aerospace-grade fasteners are preferred.

Related Standards

  • EN 2133 – Aerospace standard for cadmium plating on steel components
  • EN 2137 and EN 2442 – Specifications for alloy steel bars used in aerospace fasteners
  • EN 2424 – Marking requirements for aerospace products ensuring product traceability
  • EN 9100 – Quality management systems for aviation, space, and defense organizations
  • EN 9133 – Qualification procedure for aerospace standard parts
  • ISO 3353-1 – Thread lead and runout standards applicable to aerospace rolled external threads
  • ISO 5855-2 – Limit dimensions for MJ threads for bolts and nuts in aerospace
  • ISO 7689 – Procurement specification for aerospace bolts with MJ threads and 1100 MPa strength
  • ISO 7913 – Tolerances of form and position for aerospace bolts and screws
  • ISO 14275 / ISO 14276 – Internal offset cruciform drives standards tailored to aerospace needs

Keywords: EN 4138:2016, aerospace screws standard, pan head screws, offset cruciform recess, alloy steel screws, cadmium plated screws, aerospace fastener specifications, 1100 MPa tensile strength screws, medium thread length screws, aerospace quality management, aerospace screw tolerances, high-temperature aerospace screws.

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Frequently Asked Questions

EN 4138:2016 is a standard published by the European Committee for Standardization (CEN). Its full title is "Aerospace series - Screws, pan head, offset cruciform recess, coarse tolerance normal shank, medium length thread, in alloy steel, cadmium plated - Classification: 1 100 MPa (at ambient temperature) / 235 °C". This standard covers: This standard specifies the characteristics of screws, pan head, offset cruciform recess, coarse tolerance normal shank, medium length thread, in alloy steel, cadmium plated. Classification: 1 100 MPa ) / 235 °C )

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

EN 4138:2016 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.

EN 4138:2016 has the following relationships with other standards: It is inter standard links to EN 4138:2009, EN 16306:2013, EN 9133:2018, EN ISO 17855-1:2014, EN 868-3:2009, EN 868-6:2009, EN 868-2:2009, EN 868-7:2009, EN 868-4:2009. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.

EN 4138:2016 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)


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Aerospace series - Screws, pan head, offset cruciform recess, coarse tolerance normal
shank, medium length thread, in alloy steel, cadmium plated - Classification: 1 100 MPa
(at ambient temperature) / 235 °C
Luft- und Raumfahrt - Flachkopfschrauben, mit Flügelkreuzschlitz, mittlere
Gewindelänge, 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 moyen, en acier allié, cadmiées - Classification: 1 100 MPa (à
température ambiante) / 235 °C
Ta slovenski standard je istoveten z: EN 4138:2016
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 4138
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2016
EUROPÄISCHE NORM
ICS 49.030.20 Supersedes EN 4138:2009
English Version
Aerospace series - Screws, pan head, offset cruciform
recess, coarse tolerance normal shank, medium length
thread, in alloy steel, cadmium plated - Classification: 1
100 MPa (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, mittlere Gewindelänge, aus
filetage moyen, en acier allié, cadmiées - Classification: legiertem Stahl, verkadmet - Klasse: 1 100 MPa (bei
1 100 MPa (à température ambiante) / 235 °C Raumtemperatur) / 235 °C
This European Standard was approved by CEN on 27 September 2015.

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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, 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: Avenue Marnix 17, B-1000 Brussels
© 2016 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 4138:2016 E
worldwide for CEN national Members.

Contents Page
European Foreword . 3
1 Scope . 4
2 Normative references . 4
3 Required characteristics . 5
4 Designation. 8
5 Marking . 8
6 Technical specification . 9
Annex A (informative) Standard evolution form . 10

European Foreword
This document (EN 4138:2016) 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 2016, and conflicting national standards
shall be withdrawn at the latest by September 2016.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent
rights.
This document supersedes EN 4138:2009.
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, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
...

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