prEN 4178
(Main)Aerospace series - Screw, pan head, six lobe recess, coarse tolerance normal shank, medium length thread, in titanium alloy, anodized, MoS2 lubricated - Classification: 1 100 MPa (at ambient temperature)/315 °C
Aerospace series - Screw, pan head, six lobe recess, coarse tolerance normal shank, medium length thread, in titanium alloy, anodized, MoS2 lubricated - Classification: 1 100 MPa (at ambient temperature)/315 °C
This document specifies the characteristics of screws, pan head, six lobe recess, coarse tolerance normal shank, medium length thread, in titanium alloy, anodized, MoS2 lubricated.
Classification: 1 100 MPa /315 °C .
Luft‑ und Raumfahrt - Flachkopfschraube mit Sechs‑Bogenzahn, mit mittlerer Gewindelänge, aus Titanlegierung, anodisiert, MoS2‑geschmiert - Klasse: 1 100 MPa (bei Raumtemperatur)/315 °C
Dieses Dokument legt die Eigenschaften von Flachkopfschrauben mit Sechs-Bogenzahn und mittlerer Gewindelänge aus Titanlegierung, anodisiert, MoS2-geschmiert, fest. Klasse: 1 100 MPa /315 °C
Série aérospatiale - Vis à tête cylindrique, à empreinte six lobes, tige normale à tolérance large, filetage moyen, en alliage de titane, anodisées, lubrifiées MoS2 - Classification : 1 100 MPa (à température ambiante)/315 °C
Le présent document spécifie les caractéristiques des vis à tête cylindrique, à empreinte six lobes, tige normale à tolérance large, filetage moyen, en alliage de titane, anodisées, lubrifiées au MoS2
Classification : 1 100 MPa /315 °C.
Aeronavtika - Vijak, valjasta glava, šestzoba vdolbina, široka toleranca, srednja navojna dolžina, iz titanove zlitine, anodizirani, mazani z MoS2 - Klasifikacija: 1100 MPa (pri temperaturi okolice)/315 °C
Ta dokument določa lastnosti vijakov s polkrožno glavo, šestrobno vdolbino, grobo toleranco običajnega stebla, srednje dolžine navoja, iz titanove zlitine, anodiziranih, mazani z MoS2 (molibdenov disulfid).
Razvrstitev: 1 100 MPa /315 °C .
General Information
- Status
- Not Published
- Publication Date
- 12-Sep-2027
- Technical Committee
- ASD-STAN - Aerospace
- Drafting Committee
- ASD-STAN/D 3/S 2 - Fasteners
- Current Stage
- 4020 - Submission to enquiry - Enquiry
- Start Date
- 12-Mar-2026
- Completion Date
- 12-Mar-2026
Relations
- Effective Date
- 19-Jan-2023
Overview
prEN 4178 specifies the characteristics of aerospace screws with the following features:
- Pan head design
- Six lobe recess drive
- Coarse tolerance normal shank
- Medium thread length
- Manufactured from titanium alloy
- Anodized for corrosion resistance
- Lubricated with molybdenum disulphide (MoS₂)
This standard, developed by CEN (European Committee for Standardization), classifies screws for use at a minimum tensile strength of 1,100 MPa (at ambient temperature) and continuous operation up to 315 °C. prEN 4178 is intended for critical aerospace applications, where high strength, light weight, and reliability are required under demanding conditions. It supersedes EN 4178:2017 and introduces editorial and technical updates, including revised dimensions and tolerances.
Key Topics
- Mechanical Properties: Specifies titanium alloy screws capable of minimum 1,100 MPa tensile strength at ambient temperature, maintaining integrity up to 315 °C.
- Screw Design: Details pan head with six lobe recess for optimal torque transfer and reduced risk of cam-out, supporting efficient assembly and maintenance.
- Thread and Shank: Defines normal shank diameter with coarse tolerance and medium thread length, supporting robust yet adaptable fastening options.
- Surface Treatment: Requires anodizing for corrosion resistance and MoS₂ (molybdenum disulphide) lubrication as per EN 2491 to minimize galling and facilitate installation.
- Dimensional Requirements: Provides tables and figures outlining required screw dimensions, tolerances, and thread specifications, adhering to international aerospace metric standards.
- Marking and Identification: Mandates marking in accordance with EN 2424 for traceability, including codes for hole type (split pin, lockwire, or none).
- Quality Assurance: Manufacturing and qualification processes must comply with accredited aerospace quality management systems, such as EN 9100 and EN 9133.
Applications
prEN 4178 screws are tailored for use in the aerospace industry where high-performance fasteners are essential. Typical applications include:
- Airframe structures: Suitable for areas requiring high strength-to-weight ratio and corrosion resistance, such as fuselage, wings, and empennage assembly.
- Engine components: Withstands high temperature and stress, making it apt for mounting auxiliary systems and covers in engine bays.
- Cabin and interior systems: Used where lightweight and durable fasteners are needed for seating, panel attachment, and modular interior installations.
- Satellite and space hardware: Titanium alloy’s low mass and superior corrosion resistance make these screws valuable for spacecraft assembly.
Benefits of prEN 4178 screws:
- Extended service life due to anodized titanium construction
- Reliable fastening with consistent mechanical performance in harsh environments
- Compatibility with standard aerospace assembly tools (six lobe recess)
- Reduced maintenance needs through MoS₂ lubrication
Related Standards
To ensure full compliance and optimal integration, prEN 4178 references and aligns with several other important aerospace standards, including:
- EN 2424: Aerospace series - Marking of aerospace products
- EN 2491: Aerospace series - Molybdenum disulphide dry lubricants - Coating methods
- EN 3911: Aerospace series - Six lobe recess - Geometrical definition
- ISO 3353-1: Aerospace - Lead and runout threads - Part 1: Rolled external threads
- ISO 5855-2: Aerospace - MJ threads - Limit dimensions for bolts and nuts
- ISO 9152: Aerospace - Bolts in titanium alloys, strength class 1 100 MPa - Procurement specification
- EN 9100 & EN 9133: Quality management systems and qualification procedures for aerospace standard products
- TR 3775 & TR 4070: Technical references on titanium alloys and MoS₂ coatings
Organizations adopting prEN 4178 will benefit from fasteners meeting stringent aerospace performance, safety, and traceability requirements, aligning with global best practices in aerospace engineering and manufacturing.
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Frequently Asked Questions
prEN 4178 is a draft published by the European Committee for Standardization (CEN). Its full title is "Aerospace series - Screw, pan head, six lobe recess, coarse tolerance normal shank, medium length thread, in titanium alloy, anodized, MoS2 lubricated - Classification: 1 100 MPa (at ambient temperature)/315 °C". This standard covers: This document specifies the characteristics of screws, pan head, six lobe recess, coarse tolerance normal shank, medium length thread, in titanium alloy, anodized, MoS2 lubricated. Classification: 1 100 MPa /315 °C .
This document specifies the characteristics of screws, pan head, six lobe recess, coarse tolerance normal shank, medium length thread, in titanium alloy, anodized, MoS2 lubricated. Classification: 1 100 MPa /315 °C .
prEN 4178 is classified under the following ICS (International Classification for Standards) categories: 49.030.10 - Screw threads; 49.030.20 - Bolts, screws, studs. The ICS classification helps identify the subject area and facilitates finding related standards.
prEN 4178 has the following relationships with other standards: It is inter standard links to EN 4178:2017. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
prEN 4178 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-2026
Aeronavtika - Vijak, valjasta glava, šestzoba vdolbina, široka toleranca, srednja
navojna dolžina, iz titanove zlitine, anodizirani, mazani z MoS2 - Klasifikacija: 1100
MPa (pri temperaturi okolice)/315 °C
Aerospace series - Screw, pan head, six lobe recess, coarse tolerance normal shank,
medium length thread, in titanium alloy, anodized, MoS2 lubricated - Classification: 1 100
MPa (at ambient temperature)/315 °C
Luft- und Raumfahrt - Flachkopfschraube mit Sechs-Bogenzahn, mit mittlerer
Gewindelänge, aus Titanlegierung, anodisiert, MoS2-geschmiert - Klasse: 1 100 MPa
(bei Raumtemperatur)/315 °C
Série aérospatiale - Vis à tête cylindrique, à empreinte six lobes, tige normale à
tolérance large, filetage moyen, en alliage de titane, anodisées, lubrifiées MoS2 -
Classification : 1 100 MPa (à température ambiante)/315 °C
Ta slovenski standard je istoveten z: prEN 4178
ICS:
49.025.30 Titan Titanium
49.030.10 Navoji Screw threads
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
DRAFT
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2026
ICS 49.030.10 Will supersede EN 4178:2017
English Version
Aerospace series - Screw, pan head, six lobe recess, coarse
tolerance normal shank, medium length thread, in
titanium alloy, anodized, MoS2 lubricated - Classification:
1 100 MPa (at ambient temperature)/315 °C
Série aérospatiale - Vis à tête cylindrique, à empreinte Luft- und Raumfahrt - Flachkopfschrauben mit Sechs-
six lobes, tige normale à tolérance large, filetage Bogenzahn, mit mittlerer Gewindelänge, aus
moyen, en alliage de titane, anodisées, lubrifiées MoS2 Titanlegierung, anodisiert, MoS<(Index)2>-
- Classification : 1 100 MPa (à température geschmiert - Klasse: 1 100 MPa (bei
ambiante)/315 °C Raumtemperatur)/315 °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
© 2026 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 4178:2026 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 . 4
4.1 Configuration – Dimensions – Mass. 4
4.2 Tolerances of form and position . 5
4.3 Materials . 5
4.4 Surface treatment . 5
5 Designation . 8
6 Marking . 8
7 Technical specification . 8
7.1 General. 8
7.2 Approval of manufacturers . 8
7.3 Qualification of bolts. 9
Bibliography . 10
European foreword
This document (prEN 4178:2026) 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 document is currently submitted to the CEN Enquiry.
This document will supersede EN 4178:2017.
— Clause 3 “Terms and definitions” ad
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