EN 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
General Information
- Abstract
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..
- Status
- Published
- Publication Date
- 01-Sep-2026
- Technical Committee
- ASD-STAN - Aerospace
- Drafting Committee
- ASD-STAN/D 3/S 2 - Fasteners
- Current Stage
- 6060 - Definitive text made available (DAV) - Publishing
- Start Date
- 02-Sep-2026
- Completion Date
- 02-Sep-2026
Overview
EN 3740:2026 - Aerospace Series Bolts specifies the characteristics and requirements for shouldered bolts with a thin hexagonal head, close tolerance shank, and short thread, manufactured in titanium alloy. These bolts are designed for aerospace applications and feature anodized surfaces with MoS2 (molybdenum disulphide) dry film coating, offering reliable performance under demanding conditions, namely at a minimum tensile strength of 1 100 MPa at ambient temperature and operational suitability up to 315 °C.
Developed by CEN (European Committee for Standardization), this standard ensures compatibility, quality, and safety for bolts used in aerospace structures. EN 3740:2026 supersedes EN 3740:2019, reflecting updates in surface treatment processes and editorial revisions.
Key Topics
- Product Characteristics: Defines bolts with a shouldered, thin hexagonal head, precise close tolerance shank, and short thread design, all fabricated in high-performance titanium alloys.
- Surface Treatments: Specifies anodizing and MoS2 dry film coating for enhanced corrosion resistance, reduced friction, and improved longevity in aerospace environments.
- Dimensions & Tolerances: Details standardized dimensions and mass for various diameter codes, expressed in millimetres, including requirements for post-treatment measurements.
- Mechanical Properties: Ensures a minimum tensile strength of 1 100 MPa at ambient temperature and temperature resistance up to 315 °C without altering the bolt’s original characteristics.
- Marking & Identification: Requires clear product marking per EN 2424 for traceability, including both nominal and coating codes.
Applications
EN 3740:2026 bolts are specifically tailored for the aerospace industry, where component integrity and material performance are critical to safety and efficiency. Typical applications include:
- Aircraft Structures: Used in critical assemblies where reliability under variable loads and temperatures is essential.
- Aerospace Engines and Systems: Suitable for mounting parts within engines and subsystems experiencing elevated temperatures.
- Spacecraft: Application in structures where weight reduction and corrosion resistance are vital through the use of titanium alloy and advanced coatings.
- Maintenance and Repairs: Ensures replacement bolts meet consistent European standards, assisting in regular MRO (Maintenance, Repair, and Overhaul) operations.
These bolts are intended to be used in conjunction with washers compliant with EN 2414 and nuts according to EN 3230.
Related Standards
Organizations seeking comprehensive standardization benefit from considering the following related documents:
- EN 2424 - Aerospace series: Marking of aerospace products.
- EN 2491 - Molybdenum disulphide dry lubricants: Coating methods.
- EN 2414 - Washers, chamfered, with counterbore, in alloy steel, cadmium plated.
- EN 3230 - Nuts, hexagon, slotted/castellated, reduced height, normal across flats, steel, cadmium plated.
- EN 4016 - Oversized bolts for aerospace use.
- ISO 3353-1 and ISO 5855-2 - Threads and tolerances for aerospace fasteners.
- ISO 7913 - Tolerances of form and position for bolts and screws, metric.
- ISO 9152 - Aerospace bolts with MJ threads in titanium alloy, procurement specification.
- EN 9100 and EN 9133 - Aerospace quality management and qualification procedures.
Practical Value
By conforming to EN 3740:2026, aerospace manufacturers and maintenance providers are assured of:
- Interchangeability and Reliability: Standardized dimensions and properties ensure consistent quality and fitment across the aerospace sector.
- Enhanced Performance: Titanium alloy and specialized coatings extend component service life in harsh operating environments.
- Regulatory Compliance: Meeting European and global requirements for aerospace hardware, supporting safety-critical operations.
- Supply Chain Assurance: Facilitates sourcing from multiple approved suppliers, fostering competition and reducing costs while maintaining quality.
EN 3740:2026 strengthens product consistency, safety, and technological advancement in aerospace fastening solutions.
Relations
- Effective Date
- 20-Nov-2024
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Frequently Asked Questions
EN 3740:2026 is a standard published by the European Committee for Standardization (CEN). 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..
EN 3740:2026 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 3740:2026 has the following relationships with other standards: It is inter standard links to EN 3740:2019. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
EN 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
01-november-2026
Aeronavtika - Sorniki, vezi, tanka šesterokotna glava, ozka toleranca, kratek navoj,
iz titanove zlitine, anodizirani, mazani z MoS2 - Klasifikacija: 1100 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: EN 3740:2026
ICS:
49.025.30 Titan Titanium
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 3740
EUROPEAN STANDARD
NORME EUROPÉENNE
September 2026
EUROPÄISCHE NORM
ICS 49.030.20 Supersedes EN 3740:2019
English Version
Aerospace series - Bolts, shouldered, thin hexagonal head,
close tolerance shank, short thread, in titanium alloy,
anodized, MoS coated - Classification: 1 100 MPa (at
ambient temperature)/315 °C
Série aérospatiale - Vis épaulées, à tête hexagonale fine, Luft- und Raumfahrt - Sechskant-Passschrauben,
tige à tolérance serrée, filetage court, en alliage de kleiner Kopf, enge Schafttoleranz, kurzes Gewinde, aus
titane, anodisées, revêtues MoS - Classification : 1 100 Titanlegierung, anodisiert, MoS -geschmiert - Klasse: 1
2 2
MPa (à température ambiante)/315 °C 100 MPa (bei Raumtemperatur)/315 °C
This European Standard was approved by CEN on 3 August 2026.
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, 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.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATIO N
EUROPÄISCHES KOMITEE FÜR NORMUN G
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. EN 3740:2026 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 . 9
6 Marking . 9
7 Technical specification . 9
8 Oversized bolts . 9
Bibliography. 10
European foreword
This document (EN 3740:2026) 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 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 March 2027, and conflicting national standards shall be
withdrawn at the latest by March 2027.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 3740:2019.
This document includes the following significant technical changes with respect to EN 3740:2019:
— 4.4 “Surface treatment”, restrictions for coating (“code G or code J”) deleted;
— document editorially revised.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
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, France, Germany, Greece, Hungary, Iceland, Ireland,
Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of Nort
...