EN 4131:2026
(Main)Aerospace series - Bolt, normal hexagonal head, coarse tolerance normal shank, medium length thread, in heat resisting nickel base alloy, aluminium IVD coated - Classification: 1 250 MPa (at ambient temperature) / 425 °C
General Information
- Abstract
This document specifies the characteristics of bolts, normal hexagonal head, coarse tolerance normal shank, medium length thread, in heat resisting nickel base alloy, aluminium IVD coated.
Classification: 1 250 MPa / 425 °C
- Status
- Not Published
- Publication Date
- 25-Aug-2026
- Technical Committee
- ASD-STAN - Aerospace
- Drafting Committee
- ASD-STAN/D 3/S 2 - Fasteners
- Current Stage
- 5060 - Closure of Vote - Formal Approval
- Start Date
- 02-Jul-2026
- Completion Date
- 02-Jul-2026
Overview
EN 4131:2026 is a European standard developed by CEN as part of the Aerospace series. This document specifies the characteristics of bolts with a normal hexagonal head, coarse tolerance normal shank, and medium length thread, manufactured from heat resisting nickel base alloy and coated with aluminium by IVD (Ion Vapour Deposition). The bolts are classified for a tensile strength of 1 250 MPa (at ambient temperature) and a maximum service temperature of 425°C. These specification requirements make EN 4131:2026 particularly relevant for high-strength and high-temperature aerospace applications where corrosion and thermal resistance are critical.
Key Topics
Bolt Design & Dimensions
The standard defines bolts with a normal hexagonal head, a coarse tolerance shank, and a medium thread length, detailing dimensional and tolerance requirements according to international aerospace standards.Material Specifications
Bolts are manufactured from certified heat resisting nickel base alloys suitable for high-stress and elevated temperature environments.Surface Treatment
IVD aluminium coating is specified to provide protection against corrosion and oxidation, ensuring longevity and reliability in demanding aerospace conditions.Mechanical Classification
The bolts must demonstrate a minimum tensile strength of 1 250 MPa at ambient temperature, retaining performance characteristics up to 425°C.Quality Management & Qualification
Manufacturers must have an approved aerospace quality management system (e.g., EN 9100), and bolts must be qualified per procedures specified in EN 9133 or similar industry practices.
Applications
EN 4131:2026 bolts are specially designed for demanding aerospace applications where components are exposed to high mechanical loads and significant temperature fluctuations.
Key usage scenarios include:
Aircraft Structures
Primary structural assemblies, including fuselage and wing attachments, where both strength and corrosion resistance are necessary.Engine Assemblies
Fastening components in propulsion systems subject to high thermal environments.Spacecraft
Use in satellites, launch vehicles, and related assemblies that require reliable fasteners at high strength and temperature.Maintenance & Repair
Used as replacement parts in aerospace maintenance, ensuring continued conformity to critical specifications.
The combination of heat resisting alloy material and aluminium IVD coating ensures that these bolts provide long-term performance and safety in regulated environments.
Related Standards
For conformity and interoperability, the following related standards are referenced in EN 4131:2026:
- EN 2424: Aerospace series – Marking of aerospace products
- EN 2952; EN 3219; TR 3775: Aerospace heat resisting nickel base alloys for forged fasteners
- ISO 3193; ISO 3353-1; ISO 5855-2; ISO 7913: Specifications for bolts and threads
- MIL-DTL-83488D: Aluminium coating requirements
- EN 2583: Technical specifications for aerospace fasteners
- EN 9100; EN 9133: Quality management systems and qualification for aerospace standard products
Practical Value
By adhering to EN 4131:2026, aerospace manufacturers and maintenance providers ensure that critical fastener components meet unified requirements for strength, thermal resistance, and corrosion protection. This supports higher safety, reliability, and performance in aircraft and spacecraft, facilitates compliance across different regulatory regimes, and streamlines certification and procurement processes across the aerospace industry.
Implementing EN 4131:2026 helps to reduce risk, enhance safety, and align with global best practices in aerospace engineering.
Keywords: EN 4131:2026, aerospace bolts, hexagonal head bolt, nickel base alloy, aluminium IVD coating, high temperature fasteners, 1 250 MPa, 425°C, CEN, aerospace series standards, fastener classification, European standard.
Relations
- Effective Date
- 12-Feb-2025
- Effective Date
- 12-Feb-2025
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Frequently Asked Questions
EN 4131:2026 is a draft published by the European Committee for Standardization (CEN). Its full title is "Aerospace series - Bolt, normal hexagonal head, coarse tolerance normal shank, medium length thread, in heat resisting nickel base alloy, aluminium IVD coated - Classification: 1 250 MPa (at ambient temperature) / 425 °C". This standard covers: This document specifies the characteristics of bolts, normal hexagonal head, coarse tolerance normal shank, medium length thread, in heat resisting nickel base alloy, aluminium IVD coated. Classification: 1 250 MPa / 425 °C
This document specifies the characteristics of bolts, normal hexagonal head, coarse tolerance normal shank, medium length thread, in heat resisting nickel base alloy, aluminium IVD coated. Classification: 1 250 MPa / 425 °C
EN 4131:2026 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 4131:2026 has the following relationships with other standards: It is inter standard links to EN 4131:2009, EN 4131:2009/AC:2010. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
EN 4131:2026 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 4131:2025
01-oktober-2025
Aeronavtika - Sorniki, normalna šestroba glava, široka toleranca, srednja navojna
dolžina, iz toplotnoodporne zlitine na nikljevi osnovi, prevlečene z aluminijem IVD -
Klasifikacija: 1 250 MPa (pri temperaturi okolice)/425 °C
Aerospace series - Bolt, normal hexagonal head, coarse tolerance normal shank,
medium length thread, in heat resisting nickel base alloy, aluminium IVD coated -
Classification: 1 250 MPa (at ambient temperature) / 425 °C
Luft- und Raumfahrt - Sechskantschraube, mittlere Gewindelänge, aus hochwarmfester
Nickelbasislegierung, Aluminium‑IVD‑beschichtet - Klasse: 1 250 MPa (bei
Raumtemperatur)/425 °C
Série aérospatiale - Vis à tête hexagonale normale, tige normale à tolérance large,
filetage moyen, en alliage résistant à chaud à base de nickel, revêtues aluminium IVD -
Classification: 1 250 MPa (à température ambiante) / 425 °C
Ta slovenski standard je istoveten z: prEN 4131
ICS:
49.025.20 Aluminij Aluminium
49.030.20 Sorniki, vijaki, stebelni vijaki Bolts, screws, studs
oSIST prEN 4131:2025 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
oSIST prEN 4131:2025
oSIST prEN 4131:2025
DRAFT
EUROPEAN STANDARD
prEN 4131
NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2025
ICS 49.030.20 Will supersede EN 4131:2009
English Version
Aerospace series - Bolt, normal hexagonal head, coarse
tolerance normal shank, medium length thread, in heat
resisting nickel base alloy, aluminium IVD coated -
Classification: 1 250 MPa (at ambient temperature) / 425
°C
Série aérospatiale - Vis à tête hexagonale normale, tige Luft- und Raumfahrt - Sechskantschraube, mittlere
normale à tolérance large, filetage moyen, en alliage Gewindelänge, aus hochwarmfester
résistant à chaud à base de nickel, revêtues aluminium Nickelbasislegierung, Aluminium-IVD-beschichtet -
IVD - Classification: 1 250 MPa (à température Klasse: 1 250 MPa (bei Raumtemperatur)/425 °C
ambiante) / 425 °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
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 4131:2025 E
worldwide for CEN national Members.
oSIST prEN 4131:2025
prEN 4131:2025 (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 . 8
6 Marking . 8
7 Technical specification . 9
7.1 General. 9
7.2 Approval of manufacturers . 9
7.3 Qualification of bolts. 9
Bibliography . 10
oSIST prEN 4131:2025
prEN 4131:2025 (E)
European foreword
This document (prEN 4131:2025) 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 4131:2009/AC:2010.
prEN 4131:2025 includes the following significant technical changes with respect to
EN 4131:2009/AC:2010:
— Clause 2, Normative references, has been updated;
— Clause 3, Terms and definitions, added;
— Table 3 has been updated with new drive code references;
— the technical specification has been changed to EN 2583;
— subclause 7.4, Other modified requirement, has been updated.
oSIST prEN 4131:2025
prEN 4131:2025 (E)
1 Scope
This document specifies the characteristics of bolts, normal hexagonal head, coarse tolerance normal
shank, medium length thread, in heat resisting nickel base alloy, aluminium IVD coated.
1 2
Classification: 1 250 MPa / 425 °C
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
...