kSIST FprEN 3740:2026
(Main)Aerospace series - Bolts, shouldered, thin hexagonal head, close tolerance shank, short thread, in titanium alloy, anodized, MoS2 coated - Classification: 1 100 MPa (at ambient temperature)/315 °C
Aerospace series - Bolts, shouldered, thin hexagonal head, close tolerance shank, short thread, in titanium alloy, anodized, MoS2 coated - Classification: 1 100 MPa (at ambient temperature)/315 °C
This document specifies the characteristics of bolts, shouldered, thin hexagonal head, close tolerance shank, short thread, in titanium alloy, anodized, MoS2 dryfilm coated, for aerospace applications.
Classification: 1 100 MPa1/315 °C2..
Luft- und Raumfahrt - Sechskant-Passschrauben, kleiner Kopf, enge Schafttoleranz, kurzes Gewinde, aus Titanlegierung, anodisiert, MoS2‑geschmiert - Klasse: 1 100 MPa (bei Raumtemperatur)/315 °C
Dieses Dokument legt die Eigenschaften von Sechskant-Passschrauben mit kleinem Kopf, enge Schafttoleranz, kurzes Gewinde, aus Titanlegierung, die anodisiert und mit einem MoS2-Trockenfilm beschichtet sind, für Anwendungen in der Luft- und Raumfahrt fest.
Klasse: 1 100 MPa1/315 °C2.
Série aérospatiale - Vis épaulées, à tête hexagonale fine, tige à tolérance serrée, filetage court, en alliage de titane, anodisées, revêtues MoS2 - Classification : 1 100 MPa (à température ambiante)/315 °C
Le présent document spécifie les caractéristiques des vis épaulées, à tête hexagonale fine, tige à tolérance serrée, filetage court, en alliage de titane, anodisées, revêtues de film sec MoS2, pour les applications aérospatiales.
Classification : 1 100 MPa /315 °C.
Ces vis sont destinées à être utilisées avec des rondelles conformes à l’EN 2414 et des écrous conformes à l’EN 3230.
Aeronavtika - Sorniki, vezi, tanka šesterokotna glava, ozka toleranca, kratek navoj, iz titanove zlitine, anodizirani, mazani z MoS2 - Klasifikacija: 1 100 MPa (pri temperaturi okolice)/315 °C
General Information
- Status
- Not Published
- Public Enquiry End Date
- 24-Sep-2025
- Technical Committee
- I13 - Imaginarni 13
- Current Stage
- 5020 - Formal vote (FV) (Adopted Project)
- Start Date
- 14-May-2026
- Due Date
- 02-Jul-2026
- Completion Date
- 15-May-2026
Relations
- Effective Date
- 20-Nov-2024
Overview
kSIST FprEN 3740:2026 is a European standard developed by SIST, specifying the requirements for aerospace bolts with a shouldered design, thin hexagonal heads, close tolerance shanks, and short threads. These bolts are manufactured from titanium alloy, feature anodized surfaces, and are coated with molybdenum disulphide (MoS₂) dryfilm, ensuring enhanced durability and performance under demanding operational environments. The bolts are classified for use at 1,100 MPa tensile strength (at ambient temperature) and up to 315 °C, making them ideal for critical aerospace applications requiring high strength and temperature resistance.
Key Topics
- Product Characteristics: The standard details the dimensions, tolerances, and physical features of shouldered bolts, such as configuration, mass, close tolerance shanks, short threads, and thin hex heads.
- Material and Surface Treatments: Bolts are made from titanium alloy to ensure lightweight and high strength, anodized for corrosion resistance, and MoS₂ coated to reduce friction and increase lifespan.
- Mechanical Classification: Bolts are rated to 1,100 MPa and 315 °C, supporting stressed aerospace environments.
- Compatibility: Designed for use with washers per EN 2414 and nuts per EN 3230, ensuring standardized system integration.
- Marking and Designation: Requirements for marking according to EN 2424 and specification for product designation to ensure traceability and standardization.
Applications
The scope of kSIST FprEN 3740:2026 is focused on the aerospace sector, offering standardized fasteners for:
- Aircraft Airframe Assemblies: These titanium alloy bolts are widely used in assembling fuselage, wings, and control surfaces where high strength and low weight are critical.
- Spacecraft Construction: The high resistance to corrosion and high operational temperature rating make these bolts suitable for space vehicles and satellite components.
- Engine and Component Mounting: The strong, close-tolerance design supports secure mounting for engines and high-performance subsystems under thermal and mechanical loads.
- Maintenance and Repair Operations: Adherence to this standard simplifies sourcing and quality assurance for replacement bolts during MRO activities across the aerospace industry.
Bolts produced to this standard improve interchangeability, support modular assembly, and enhance system reliability due to their superior uniform properties and tested quality.
Related Standards
Several standards are referenced within kSIST FprEN 3740:2026, providing a comprehensive framework for quality and compatibility:
- EN 2424: Aerospace series - Marking of aerospace products
- EN 2414: Washers, chamfered, with counterbore, in alloy steel, cadmium plated
- EN 2491: Molybdenum disulphide dry lubricants - Coating methods
- EN 4016: Oversized bolts
- EN 3230: Aerospace nuts, hexagon, slotted / castellated, reduced height
- ISO 3353-1: Lead and runout threads for aerospace MJ threads
- ISO 5855-2: Limit dimensions for bolts and nuts, MJ threads
- ISO 7913: Tolerances of form and position for bolts and screws, metric
- ISO 9152: Procurement specification for titanium alloy bolts
- EN 9100 / EN 9133: Quality management systems and qualification procedures for aerospace products
- TR 3775, TR 4070: Materials and MoS₂ coatings lists for bolts and pins
By complying with kSIST FprEN 3740:2026 and related standards, manufacturers and aerospace operators ensure robust, traceable, and reliable fastening solutions tailored to the demands of modern aerospace applications.
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Frequently Asked Questions
kSIST FprEN 3740:2026 is a draft published by the Slovenian Institute for Standardization (SIST). Its full title is "Aerospace series - Bolts, shouldered, thin hexagonal head, close tolerance shank, short thread, in titanium alloy, anodized, MoS2 coated - Classification: 1 100 MPa (at ambient temperature)/315 °C". This standard covers: This document specifies the characteristics of bolts, shouldered, thin hexagonal head, close tolerance shank, short thread, in titanium alloy, anodized, MoS2 dryfilm coated, for aerospace applications. Classification: 1 100 MPa1/315 °C2..
This document specifies the characteristics of bolts, shouldered, thin hexagonal head, close tolerance shank, short thread, in titanium alloy, anodized, MoS2 dryfilm coated, for aerospace applications. Classification: 1 100 MPa1/315 °C2..
kSIST FprEN 3740:2026 is classified under the following ICS (International Classification for Standards) categories: 49.025.30 - Titanium; 49.030.20 - Bolts, screws, studs. The ICS classification helps identify the subject area and facilitates finding related standards.
kSIST FprEN 3740:2026 has the following relationships with other standards: It is inter standard links to SIST EN 3740:2020. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
kSIST FprEN 3740:2026 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 3740:2025
01-september-2025
Aeronavtika - Sorniki, vezi, tanka šesterokotna glava, ozka toleranca, kratek navoj,
iz titanove zlitine, anodizirani, mazani z MoS2 - Klasifikacija: 1 100 MPa (pri
temperaturi okolice)/315 °C
Aerospace series - Bolts, shouldered, thin hexagonal head, close tolerance shank, short
thread, in titanium alloy, anodized, MoS2 coated - Classification: 1 100 MPa (at ambient
temperature)/315 °C
Luft- und Raumfahrt - Sechskant-Passschrauben, kleiner Kopf, enge Schafttoleranz,
kurzes Gewinde, aus Titanlegierung, anodisiert, MoS2‑geschmiert - Klasse: 1 100 MPa
(bei Raumtemperatur)/315 °C
Série aérospatiale - Vis épaulées, à tête hexagonale fine, tige à tolérance serrée, filetage
court, en alliage de titane, anodisées, revêtues MoS2 - Classification : 1 100 MPa (à
température ambiante)/315 °C
Ta slovenski standard je istoveten z: prEN 3740
ICS:
49.025.30 Titan Titanium
49.030.20 Sorniki, vijaki, stebelni vijaki Bolts, screws, studs
oSIST prEN 3740:2025 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
oSIST prEN 3740:2025
oSIST prEN 3740:2025
DRAFT
EUROPEAN STANDARD
prEN 3740
NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2025
ICS 49.030.20 Will supersede EN 3740:2019
English Version
Aerospace series - Bolts, shouldered, thin hexagonal head,
close tolerance shank, short thread, in titanium alloy,
anodized, MoS2 coated - Classification: 1 100 MPa (at
ambient temperature)/315 °C
Luft- und Raumfahrt - Sechskant-Passschrauben,
kleiner Kopf, enge Schafttoleranz, kurzes Gewinde, aus
Titanlegierung, anodisiert, MoS2-geschmiert - Klasse: 1
100 MPa (bei 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
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 3740:2025 E
worldwide for CEN national Members.
oSIST prEN 3740:2025
prEN 3740:2025 (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 . 9
6 Marking . 9
7 Technical specification . 9
8 Oversized bolts . 9
Bibliography. 10
oSIST prEN 3740:2025
prEN 3740:2025 (E)
European foreword
This document (prEN 3740:2025) 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 3740:2019.
This document includes the following significant technical changes with respect to EN 3740:2019:
— 4.4 “Surface treatment” updated;
— document editorially revised.
oSIST prEN 3740:2025
prEN 3740:2025 (E)
1 Scope
This document specifies the characteristics of bolts, shouldered, thin hexagonal head, close tolerance
shank, short thread, in titanium alloy, anodized, MoS dryfilm coated, for aerospace applications.
1 2
Classification: 1 100 MPa /315 °C .
These bolts are intended to be used with washers according to EN 2414 and nuts according to EN 3230.
2 Normative references
T
...