kSIST FprEN 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
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 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
Luft- und Raumfahrt - Sechskantschraube, mittlere Gewindelänge, aus hochwarmfester Nickelbasislegierung, Aluminium‑IVD‑beschichtet - Klasse: 1 250 MPa (bei Raumtemperatur)/425 °C
Dieses Dokument legt Eigenschaften von Sechskantschrauben mit mittlerer Gewindelänge aus hochwarmfester Nickelbasislegierung, Aluminium IVD-beschichtet, fest.
Klasse: 1 250 MPa /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
Le présent document spécifie les caractéristiques des vis à tête hexagonale normale, tige à tolérance large, filetage moyen, en alliage résistant à chaud base nickel, revêtues d'aluminium IVD.
Classification : 1 250 MPa /425 °C.
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
General Information
- Status
- Not Published
- Public Enquiry End Date
- 22-Oct-2025
- Technical Committee
- I13 - Imaginarni 13
- Current Stage
- 5020 - Formal vote (FV) (Adopted Project)
- Start Date
- 18-May-2026
- Due Date
- 06-Jul-2026
- Completion Date
- 19-May-2026
Relations
- Effective Date
- 12-Feb-2025
- Effective Date
- 12-Feb-2025
Overview
kSIST FprEN 4131:2026 is a European standard from SIST that specifies the requirements for aerospace bolts featuring a normal hexagonal head, a coarse tolerance normal shank, and a medium length thread. These bolts are made from a heat-resisting nickel base alloy and finished with aluminium IVD (Ion Vapor Deposition) coating. Classification is based on a minimum tensile strength of 1 250 MPa at ambient temperature and a maximum use temperature of 425 °C.
This standard ensures that fasteners used in aerospace applications maintain high performance under demanding thermal and mechanical conditions. kSIST FprEN 4131:2026 supersedes previous versions (EN 4131:2009/AC:2010), introducing updated references, definitions, drive code descriptions, and technical specifications.
Key Topics
Bolt Characteristics
- Normal hexagonal head design
- Coarse tolerance normal shank for robust fit
- Medium length thread suitable for aerospace assemblies
Material Specifications
- Made from heat resisting nickel base alloys as per EN 2952, EN 3219, or ASD-STAN TR 3775
- Ensures durability and resistance at high temperatures
Surface Treatment
- Aluminium IVD coating in accordance with MIL-DTL-83488D, Type II, Class 3 (thickness: 7-20 μm)
- Provides improved corrosion resistance and high-temperature protection
Technical and Quality Requirements
- Dimensions and tolerances as per ISO 3193 and ISO 7913
- Manufacturer approval requires an aerospace-quality management system (e.g. EN 9100)
- Qualification must follow standardized aerospace procedures (e.g. EN 9133)
Marking and Designation
- Defined by EN 2424 and other relevant marking standards, ensuring traceability
Applications
The kSIST FprEN 4131:2026 standard is crucial for aerospace manufacturing and maintenance. These bolts are designed for applications where:
- High-strength, temperature-resistant fasteners are essential
- Consistent dimensional and material quality is critical for safety and performance
- Protection against oxidation and corrosion at elevated temperatures is required due to the aluminium IVD coating
Typical use cases include:
- Aircraft engine components subject to high mechanical loads and thermal cycles
- Airframe structural connections that must withstand varying temperature environments
- Other critical aerospace assemblies where reliability and traceability of fasteners are mandatory
By following this standard, organizations ensure compatibility with existing aerospace systems and compliance with international quality requirements.
Related Standards
- EN 2424 - Marking of aerospace products
- EN 2952 - Heat resisting alloy NI-PH2601 for aerospace applications
- EN 3219 - Nickel base alloy (NI-P100HT) for forging or extrusion
- EN 2583 - Technical specification for aerospace fasteners
- EN 9100 - Quality management systems for aviation, space, and defense
- EN 9133 - Qualification procedures for aerospace standard products
- ISO 3193 - Dimensions for hexagonal head bolts
- ISO 3353-1 - Rolled external thread standards
- ISO 5855-2 - MJ threads limit dimensions for bolts and nuts
- ISO 7913 - Tolerances for bolts and screws
- MIL-DTL-83488D - Specification for aluminium IVD coating
Compliance with kSIST FprEN 4131:2026 helps organizations meet regulatory and quality demands for aerospace fasteners, ensuring safety, reliability, and global interoperability.
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Frequently Asked Questions
kSIST FprEN 4131:2026 is a draft published by the Slovenian Institute for Standardization (SIST). 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
kSIST FprEN 4131:2026 is classified under the following ICS (International Classification for Standards) categories: 49.025.20 - Aluminium; 49.030.20 - Bolts, screws, studs. The ICS classification helps identify the subject area and facilitates finding related standards.
kSIST FprEN 4131:2026 has the following relationships with other standards: It is inter standard links to SIST EN 4131:2009, SIST EN 4131:2009/AC:2010. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
kSIST FprEN 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
...