SIST EN 3327:2026
(Main)Aerospace series - Bolts, double hexagon head, close tolerance, medium thread length, in heat resisting nickel base alloy NI-P100HT (Inconel 718), uncoated - Classification: 1 275 MPa/650 °C
General Information
- Abstract
This document specifies the dimensions of uncoated double hexagon head bolts, close tolerance, with MJ-thread, medium thread length, in heat-resisting nickel base alloy NI-P100HT for aerospace applications.
Maximum test temperature of the parts is 650 °C.
These bolts are used in aerospace fastening systems mainly stressed in shearing force.
- Status
- Published
- Public Enquiry End Date
- 09-Sep-2025
- Publication Date
- 13-Sep-2026
- Technical Committee
- I13 - Imaginarni 13
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 04-Sep-2026
- Due Date
- 09-Nov-2026
- Completion Date
- 14-Sep-2026
Overview
SIST EN 3327:2026 defines the specifications for uncoated, double hexagon head bolts, featuring close tolerance and medium thread length, manufactured from heat-resisting nickel base alloy NI-P100HT (commonly known as Inconel 718). Developed for aerospace applications, these bolts offer high strength and durability, supporting a maximum test temperature of 650 °C and a classification level of 1,275 MPa. As aerospace fastening components, these bolts are primarily designed to be subjected to shear forces in critical environments.
Key Topics
- Bolt Type and Design:
Double hexagon head, close tolerance for precision fit, with medium thread length and MJ-thread per EN and ISO standards. - Material:
Made from NI-P100HT (Inconel 718), a heat- and corrosion-resistant nickel base alloy compliant with SAE AMS5662 and TR 3775, suitable for high-stress, high-temperature aerospace conditions. - Temperature and Performance:
These bolts are engineered for safe operation up to 650 °C, ensuring reliability in demanding aerospace environments. - Surface Treatment:
Supplied uncoated for applications where direct metal-to-metal contact and material characteristics are critical. - Dimensional Compliance:
Fully detailed dimensions, tolerances, and configuration specifications ensure interchangeability and consistency in aerospace fastening systems.
Applications
- Aerospace Structures:
Used extensively in primary and secondary aerospace structures where precision, high strength, and resistance to heat are essential. Common applications include aircraft fuselages, wings, engine components, and turbine assemblies. - Fastening Systems:
Ideal for joining components that experience significant shearing forces, ensuring secure structural integrity in dynamic and extreme conditions. - High-Temperature Environments:
Suitable for components exposed to elevated temperatures, such as jet engines, exhaust systems, and high-performance propulsion units where NI-P100HT’s resistance to heat and corrosion is vital. - Maintenance and Manufacturing:
Recognized as a standard solution for new builds, retrofits, and repair operations, ensuring international compatibility and ease of sourcing within the aerospace industry.
Related Standards
- EN 2424:
Specifies requirements for marking aerospace products, ensuring traceability and standardization. - EN 2583:
Details technical specifications for bolts with MJ threads in heat-resisting nickel base alloys, aligned with the classification parameters. - ISO 3353-1 and ISO 4095:
Relate to lead and runout threads and bihexagonal wrenching configurations, facilitating correct assembly and maintenance. - ISO 5855 series:
Sets general requirements and dimensional limits for aerospace MJ threads, supporting compatibility with mating components. - SAE AMS5662 and TR 3775:
Reference materials and manufacturing practices for nickel alloy fasteners to ensure quality and reliability in aerospace settings.
Practical Value
Compliance with SIST EN 3327:2026 guarantees that aerospace double hexagon head bolts demonstrate consistent mechanical performance, heat resistance, and precision. Standardizing these fastening elements supports:
- Streamlined procurement and supply chain management
- Simplified assembly and maintenance procedures
- Enhanced safety and reliability in aerospace applications
By adhering to internationally harmonized dimensions and materials, organizations benefit from improved interoperability and reduced risk in high-performance aerospace assemblies.
Relations
- Effective Date
- 12-Feb-2025
Get Certified
Connect with accredited certification bodies for this standard
DEKRA North America
DEKRA certification services in North America.
Eagle Registrations Inc.
American certification body for aerospace and defense.
Element Materials Technology
Materials testing and product certification.
Sponsored listings
Frequently Asked Questions
SIST EN 3327:2026 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Aerospace series - Bolts, double hexagon head, close tolerance, medium thread length, in heat resisting nickel base alloy NI-P100HT (Inconel 718), uncoated - Classification: 1 275 MPa/650 °C". This standard covers: This document specifies the dimensions of uncoated double hexagon head bolts, close tolerance, with MJ-thread, medium thread length, in heat-resisting nickel base alloy NI-P100HT for aerospace applications. Maximum test temperature of the parts is 650 °C. These bolts are used in aerospace fastening systems mainly stressed in shearing force.
This document specifies the dimensions of uncoated double hexagon head bolts, close tolerance, with MJ-thread, medium thread length, in heat-resisting nickel base alloy NI-P100HT for aerospace applications. Maximum test temperature of the parts is 650 °C. These bolts are used in aerospace fastening systems mainly stressed in shearing force.
SIST EN 3327:2026 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.
SIST EN 3327:2026 has the following relationships with other standards: It is inter standard links to SIST EN 3327:2008. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
SIST EN 3327:2026 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-oktober-2026
Aeronavtika - Sorniki, dvojna šestroba glava, ozka toleranca, srednja navojna
dolžina, iz toplotnoodporne zlitine na nikljevi osnovi NI-P100HT (Inconel 718), brez
prevleke - Klasifikacija: 1 275 MPa/650 °C
Aerospace series - Bolts, double hexagon head, close tolerance, medium thread length,
in heat resisting nickel base alloy NI-P100HT (Inconel 718), uncoated - Classification: 1
275 MPa/650 °C
Luft- und Raumfahrt - Zwölfkant-Passschrauben, mittlere Gewindelänge, aus
hochwarmfester Nickelbasislegierung NI-P100HT (Inconel 718), blank - Klasse: 1 275
MPa/650 °C
Série aérospatiale - Vis de précision à tête bihexagonale, à filetage moyen, en alliage
résistant à chaud à base de nickel NI-P100HT (Inconel 718), non revêtu - Classification :
1 275 MPa/650 °C
Ta slovenski standard je istoveten z: EN 3327:2026
ICS:
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 3327
EUROPEAN STANDARD
NORME EUROPÉENNE
August 2026
EUROPÄISCHE NORM
ICS 49.030.20 Supersedes EN 3327:2008
English Version
Aerospace series - Bolts, double hexagon head, close
tolerance, medium thread length, in heat resisting nickel
base alloy NI-P100HT (Inconel 718), uncoated -
Classification: 1 275 MPa/650 °C
Série aérospatiale - Vis de précision à tête Luft- und Raumfahrt - Zwölfkant-Passschrauben,
bihexagonale, filetage moyen, en alliage résistant à mittlere Gewindelänge, aus hochwarmfester
chaud base nickel NI-P100HT (Inconel 718), non Nickelbasislegierung NI-P100HT (Inconel 718), blank -
revêtues - Classification : 1 275 MPa/650 °C Klasse: 1 275 MPa/650 °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 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. EN 3327:2026 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 . 5
4.1 Configuration, dimensions, tolerances and mass. 5
4.2 Material . 11
4.3 Surface treatment . 11
5 Designation . 11
6 Marking . 11
7 Technical specification . 11
European foreword
This document (EN 3327:2026) 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 February 2027, and conflicting national standards shall
be withdrawn at the latest by February 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 3327:2008.
— Clause 2 and 4.2, “Material”, standard SAE AMS5662 added;
— 3.4, “Thread surface”, removed.
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 North
Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the United
Kingdom.
1 Scope
This document specifies the dimensions of uncoated double hexagon head bolts, close tolerance, medium
® 1
thread length, in heat-resisting nickel base alloy NI-P100HT (Inconel 718 ) for aerospace applications.
Maximum test temperature of the parts is 650 °C.
These bolts are to be used in aerospace fastening systems mainly stressed in shearing force.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
EN 2424, Aerospace series — Marking of aerospace products
EN 2583, Aerospace series — Bolts, MJ threads, in heat resisting nickel base alloy NI-PH2601
(Inconel 718) — Classification: 1 275 MPa (at ambient temperature)/650 °C — Technical specification
EN 2952, Aerospace series — Heat resisting alloy NI-PH2601 — Solution treated and cold worked — Bar
for forged fasteners — D ≤ 50 mm — 1 270 MPa ≤ R ≤ 1 550 MPa
m
ISO 3353-1, Aerospace — Lead and runout threads — Part 1: Rolled external threads
ISO 4095, Aerospace — Bihexagonal drives — Wrenching configuration — Metric series
ISO 5855-1, Aerospace — MJ threads — Part 1: General requirements
ISO 5855-2, Aerospace — MJ threads — Part 2: Limit dimensions for bolts and nuts
SAE AMS5662, Nickel Alloy, Corrosion- and Heat-Resistant, Bars, Forgings, Rings, and Stock for Forgings
and Rings 52.5Ni — 19Cr — 3.0Mo — 5.1Cb (Nb) — 0.90Ti — 0.50Al — 18Fe Consumable Electrode or
Vacuum Induction Melted 1 775 °F (968 °C) Solution Heat Treated, Precipitation-Hardenable
TR 3775, Aerospace series — Bolts and pins — Materials
3 Terms and definitions
No terms and definiti
...