Aerospace series - Bolts, T-head, close tolerance, medium thread length, in heat resisting nickel base alloy NI-P100HT (Inconel 718), uncoated - Classification: 1 275 MPa/650 °C

This document specifies the dimensions of uncoated T-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.

Luft- und Raumfahrt - T-Kopf-Passschrauben, mittlere Gewindelänge, aus hochwarmfester Nickelbasislegierung NI-P100HT (Inconel 718), blank - Klasse: 1 275 MPa/650 °C

Dieses Dokument legt die Maße von blanken T-Kopf-Passschrauben mit MJ-Gewinde mittlerer Gewindelänge aus hochwarmfester Nickelbasislegierung NI P100HT für die Verwendung in der Luft- und Raumfahrt fest.
Die maximale Prüftemperatur der Teile beträgt 650 °C.
Diese Schrauben sind in Verbindungssystemen der Luft- und Raumfahrt zu verwenden, die hauptsächlich auf Scherkraft beansprucht werden.

Série aérospatiale - Vis de précision à tête anti-rotation en T, filetage moyen, en alliage résistant à chaud base nickel NI-P100HT (Inconel 718), non revêtues - Classification : 1 275 MPa/650 °CC

Le présent document spécifie les dimensions des vis de précision à tête anti-rotation en T, à filetage MJ moyen, en alliage résistant à chaud base nickel NI-P100HT, pour les applications aérospatiales.
La température maximale d'essai des pièces est de 650 °C.
Ces vis sont à utiliser dans les systèmes de fixation aérospatiaux essentiellement soumis à des efforts de cisaillement.

Aeronavtika - Sorniki, glava T, ozka toleranca, srednja navojna dolžina, iz toplotnoodporne zlitine na nikljevi osnovi NI-P100HT (Inconel 718), brez prevleke - Klasifikacija: 1 275 MPa/650 °C

General Information

Status
Not Published
Publication Date
06-Dec-2026
ICS
49.030.20 - Bolts, screws, studs
Technical Committee
ASD-STAN - Aerospace
Drafting Committee
ASD-STAN/D 3/S 2 - Fasteners
Current Stage
4060 - Closure of enquiry - Enquiry
Start Date
04-Sep-2025
Completion Date
04-Sep-2025
Ref Project
oSIST prEN 3293:2025 - Aerospace series - Bolts, T-head, close tolerance, medium thread length, in heat resisting nickel base alloy NI-P100HT (Inconel 718), uncoated - Classification: 1 275 MPa/650 °C

Relations

Revises
EN 3293:2008 - Aerospace series - Bolts, T-head, close tolerance, medium thread length, in heat resisting nickel base alloy NI-P100HT (Inconel 718), uncoated - Classification: 1 275 MPa/650 °C
Effective Date
12-Feb-2025

Overview

The prEN 3293 standard, titled "Aerospace series - Bolts, T-head, close tolerance, medium thread length, in heat resisting nickel base alloy NI-P100HT (Inconel 718), uncoated - Classification: 1 275 MPa/650 °C," is a critical specification developed by CEN for aerospace fastening components. This European committee standard focuses on uncoated T-head bolts made from heat-resistant nickel alloy NI-P100HT (Inconel 718), designed for high-performance aerospace applications.

These bolts feature close tolerance MJ threads with a medium thread length, and are engineered to withstand maximum test temperatures of up to 650 °C. Their primary mechanical application involves resisting shearing forces in aerospace assembly and fastening systems.

By adhering to this standard, manufacturers and aerospace engineers ensure bolt consistency, reliability, and safety, especially under extreme thermal and mechanical conditions.

Key Topics

  • Bolt Type and Configuration:
    Uncoated T-head bolts with close tolerance MJ threads offer precise dimensions, ensuring proper fit and functionality under severe aerospace conditions.

  • Material Specifications:
    Bolts are manufactured from heat-resisting nickel base alloy NI-P100HT (Inconel 718), complying with material requirements such as those found in SAE AMS5662. This alloy provides exceptional mechanical strength and heat resistance up to 650 °C, essential for aerospace environments.

  • Mechanical Performance:
    Classified for 1,275 MPa tensile strength at elevated temperatures, these bolts primarily resist shearing forces in aerospace fastening systems.

  • Dimensional Precision:
    The standard details exact configuration, dimensions, tolerances, and masses referencing established Aerospace Series and ISO norms (ISO 3353-1, ISO 5855). This ensures interchangeability and performance consistency.

  • Surface Finish:
    Bolts are specified as uncoated, meaning no surface treatments or coatings are applied, which is important for certain aerospace environments where coatings may interfere with performance.

  • Marking and Identification:
    Marking follows EN 2424 Style A guidelines, ensuring traceability and compliance with aerospace marking protocols.

  • Designation System:
    A clear designation format (e.g., T-HEAD BOLT EN 3293 080 050) integrates bolt type, nominal diameter code, and length code for straightforward identification and procurement.

Applications

  • High-Temperature Aerospace Fastenings:
    These T-head bolts are ideal for structural and mechanical assemblies in aerospace components that experience temperatures up to 650 °C.

  • Shear-Force Critical Joints:
    Due to their high tensile strength and precision fit, they are used in joints subject to high shearing forces, such as engine components, airframe assemblies, and heat-exposed ductwork.

  • Aerospace Manufacturing and Maintenance:
    Applicable in initial aircraft manufacturing as well as maintenance activities where reliable fastening systems must comply with strict international aerospace standards.

  • Heat-Resistant Mechanical Systems:
    Their heat-resistant alloy composition supports applications where exposure to corrosive environments and thermal cycling is expected, enhancing durability and safety.

Related Standards

  • EN 2583: Aerospace series for MJ-thread bolts in heat-resisting nickel-based alloys with similar classification and mechanical specifications.
  • EN 2424: Aerospace product marking standards ensuring proper identification and traceability of the fasteners.
  • ISO 3353-1 & ISO 5855 (Parts 1 and 2): Aerospace standards defining rolled thread profiles, lead, runout, and dimensional tolerances for MJ threads.
  • SAE AMS5662: Material specification for nickel alloys used in aerospace fasteners, providing foundational material property requirements consistent with prEN 3293.
  • TR 3775: Guidelines on bolts and pins materials, relevant for quality assurance and compliance.

By complying with prEN 3293:2025, aerospace manufacturers can optimize the performance and reliability of T-head bolts in demanding environments, ensuring high standards in safety and mechanical integrity essential for aerospace component fastening. This standard supports engineering precision, material excellence, and international interoperability crucial to aerospace industry advancements.

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Frequently Asked Questions

prEN 3293 is a draft published by the European Committee for Standardization (CEN). Its full title is "Aerospace series - Bolts, T-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 T-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 T-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.

prEN 3293 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.

prEN 3293 has the following relationships with other standards: It is inter standard links to EN 3293:2008. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.

prEN 3293 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-september-2025
Aeronavtika - Sorniki, glava T, 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, T-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 - T-Kopf-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: prEN 3293
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.

DRAFT
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2025
ICS 49.030.20 Will supersede EN 3293:2008
English Version
Aerospace series - Bolts, T-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 - T-Kopf-Passschrauben, mittlere
bihexagonale, à filetage moyen, en alliage résistant à Gewindelänge, aus hochwarmfester
chaud à base de nickel NI-P100HT (Inconel 718), non Nickelbasislegierung NI-P100HT (Inconel 718), blank -
revêtu - Classification : 1 275 MPa/650 °C Klasse: 1 275 MPa/650 °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 3293:2025 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, tolerances, masses . 4
4.2 Material . 8
4.3 Surface treatment . 8
5 Designation . 8
6 Marking . 8
7 Technical specification . 8

European foreword
This document (prEN 3293:2025) 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 3293:2008.
— material standard SAE AMS5662 added;
— 3.4 “Thread surface” removed.
1 Scope
This document specifies the dimensions of uncoated T-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.
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
ISO 3353-1, Aerospace — Lead and runout threads — Part 1: Rolled external threads
ISO 5855-1, Aerospace — MJ threads — Part 1: General requirements
ISO 5855-2, Aeros
...

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