FprEN 3613

Aerospace series - Bolts, normal hexagonal head, relieved shank, long thread, in heat resisting nickel base alloy NI-PH2601 (Inconel 718), silver plated - Classification: 1 275 MPa/650 °C

This document specifies the characteristics of bolts normal hexagonal head with relieved shank and long thread in heat resisting nickel base alloy NI-PH2601 (Inconel 718), for aerospace applications.
Classification: 1 275 MPa /650 °C

Luft‑ und Raumfahrt - Sechskantschrauben, Dünnschaft, langes Gewinde, aus hochwarmfester Nickelbasislegierung NI‑PH2601 (Inconel 718), versilbert - Klasse: 1 275 MPa/650 °C

Dieses Dokument legt die Eigenschaften von üblichen Sechskantschrauben mit Dünnschaft und langem Gewinde aus hochwarmfester Nickelbasislegierung NI PH2601 (Inconel 718) für die Anwendung in der Luft- und Raumfahrt fest.
Klasse: 1 275 MPa /650 °C

Série aérospatiale - Vis à tête hexagonale normale, tige dégagée, filetage long, en alliage résistant à chaud base nickel NI-PH2601 (Inconel 718), argentées - Classification : 1 275 MPa/650 °C

Le présent document spécifie les caractéristiques des vis à tête hexagonale normale, tige dégagée, filetage long, en alliage résistant à chaud base nickel NI-PH2601 (Inconel 718), pour les applications aérospatiales.
Classification : 1 275 MPa /650 °C.

Aeronavtika - Sorniki, normalna šestroba glava, tanko steblo, dolg navoj, iz toplotnoodporne zlitine na nikljevi osnovi NI-PH2601 (Inconel 718), posrebreni - Klasifikacija: 1 275 MPa/650 °C

General Information

• Status: Not Published
• Publication Date: 18-Oct-2026
• ICS: 49.030.20 - Bolts, screws, studs
• Technical Committee: ASD-STAN - Aerospace
• Drafting Committee: ASD-STAN/D 3/S 2 - Fasteners
• Current Stage: 4599 - Dispatch of FV draft to CMC - Finalization for Vote
• Start Date: 25-Mar-2026
• Completion Date: 25-Mar-2026
• Ref Project: oSIST prEN 3613:2025 - Aerospace series - Bolts, normal hexagonal head, relieved shank, long thread, in heat resisting nickel base alloy NI-PH2601 (Inconel 718), silver plated - Classification: 1 275 MPa/650 °C

Relations

• Revises: EN 3613:2009 - Aerospace series - Bolts, normal hexagonal head, relieved shank, long thread, in heat resisting nickel base alloy NI-PH2601 (Inconel 718), silver plated - Classification: 1 275 MPa/650 °C
• Effective Date: 12-Feb-2025

Overview

FprEN 3613 is a CEN draft standard that defines the technical requirements for aerospace bolts with a normal hexagonal head, relieved shank, and long thread. These bolts are manufactured from heat resisting nickel base alloy NI-PH2601 (Inconel 718), and feature a silver-plated surface. The classification for these bolts is 1 275 MPa tensile strength at ambient temperature and a maximum operating temperature of 650 °C. This standard is crucial for ensuring high-performance, reliable fasteners in demanding aerospace environments.

Key Topics

• Bolt Characteristics: Specification of bolts featuring a normal hexagonal head, relieved (reduced diameter) shank, and extended threading, suitable for aerospace assemblies.
• High-Performance Material: Use of nickel base alloy NI-PH2601 (Inconel 718), recognized for its heat and corrosion resistance under extreme conditions.
• Surface Coating: Requirement for electrolytic silver plating in accordance with EN 2786, providing improved corrosion protection and performance in high-temperature applications.
• Dimensional Standards: Detailed tables outlining diameter codes, available lengths, tolerances, and mass per 1,000 pieces for multiple size variants.
• Marking and Identification: Prescribes permanent product marking according to EN 2424 to assure traceability and compliance with aerospace requirements.
• Technical Specification: All bolts must meet the requirements of EN 2583, ensuring consistency within the aerospace series of fasteners.

Applications

Aerospace bolts specified in FprEN 3613 are engineered for use in aircraft and aerospace structures where strength, temperature resistance, and reliability are essential. Principal applications include:

• Aircraft Engines: Suitable for use in turbine engines and other high-heat zones due to the superior thermal stability of Inconel 718.
• Airframes and Structures: Ideal for critical structural connections subjected to high stress and environmental corrosion.
• Spacecraft Components: Applicable in satellites, launch vehicles, and other space systems requiring dependable fasteners in extreme environments.
• Defense and High-Performance Systems: Used in military aircraft, missiles, and other defense platforms that demand certified, high-strength fasteners.

Related Standards

FprEN 3613 references several important standards that further ensure the quality and interoperability of aerospace fasteners:

• EN 2583: Aerospace series – Bolts, MJ threads, in heat resisting nickel base alloy NI-PH2601 (Inconel 718) – Technical specification.
• EN 2786: Aerospace series – Electrolytic silver plating of fasteners.
• EN 2424: Aerospace series – Marking of aerospace products.
• ISO 5855-1 / ISO 5855-2: Aerospace – MJ threads – General requirements and limit dimensions for bolts and nuts.
• ISO 3353-1: Aerospace – Lead and runout threads – Rolled external threads.
• TR 3775 & SAE AMS5662: Specifications for the base alloy and its manufacturing.

Practical Value

The adoption of FprEN 3613 ensures uniformity, safety, and quality in the selection and application of aerospace bolts. Utilizing heat resisting nickel alloy and silver-plated surfaces, these fasteners provide:

• Maximum Reliability: Consistent strength and durability in high-stress and high-temperature contexts.
• Corrosion Resistance: Enhanced service life in aggressive and variable environments.
• Global Compliance: Recognition across European and international aerospace industries, simplifying procurement and maintenance processes.

By adhering to FprEN 3613, aerospace manufacturers and maintenance organizations can confidently specify bolts that meet rigorous standards for performance and safety.

Standards Content (Sample)

SLOVENSKI STANDARD
01-september-2025
Aeronavtika - Sorniki, normalna šestroba glava, tanko steblo, dolg navoj, iz
toplotnoodporne zlitine na nikljevi osnovi NI-PH2601 (Inconel 718), posrebreni -
Klasifikacija: 1 275 MPa/650 °C
Aerospace series - Bolts, normal hexagonal head, relieved shank, long thread, in heat
resisting nickel base alloy NI-PH2601 (Inconel 718), silver plated - Classification: 1 275
MPa/650 °C
Luft‑ und Raumfahrt - Sechskantschrauben, Dünnschaft, langes Gewinde, aus
hochwarmfester Nickelbasislegierung NI‑PH2601 (Inconel 718), versilbert - Klasse: 1
275 MPa/650 °C
Série aérospatiale - Vis à tête hexagonale normale, fût dégagé, filetage long, en alliage
base nickel, résistant à chaud NI-PH2601 (Inconel 718), argentées - Classification : 1
275 MPa/650 °C
Ta slovenski standard je istoveten z: prEN 3613
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
prEN 3613
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2025
ICS 49.030.20 Will supersede EN 3613:2009
English Version
Aerospace series - Bolts, normal hexagonal head, relieved
shank, long thread, in heat resisting nickel base alloy NI-
PH2601 (Inconel 718), silver plated - Classification: 1 275
MPa/650 °C
Série aérospatiale - Vis à tête hexagonale normale, fût Luft- und Raumfahrt - Sechskantschrauben,
dégagé, filetage long, en alliage base nickel, résistant à Dünnschaft, langes Gewinde, aus hochwarmfester
chaud NI-PH2601 (Inconel 718), argentées - Nickelbasislegierung NI-PH2601 (Inconel 718),
Classification : 1 275 MPa/650 °C versilbert - 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 3613:2025 E
worldwide for CEN national Members.

prEN 3613:2025 (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, tolerances, masses . 4
4.2 Surface roughness . 4
4.3 Material . 5
4.4 Surface coating . 5
5 Designation . 8
6 Marking . 8
7 Technical specification . 8
prEN 3613:2025 (E)
European foreword
This document (prEN 3613:2025) 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 3613:2009.
This document includes the following significant technical changes with respect to EN 3613:2009:
— 4.2 “Material”: material standard SAE AMS5662 added;
— 4.4 “Thread surface” removed.
prEN 3613:2025 (E)
1 Scope
This document specifies the characteristics of bolts normal hexagonal head with relieved shank and long
thread in heat resisting nickel base alloy NI-PH2601 (Inconel 718), for aerospace applications.
1 2
Classification: 1 275 MPa /650 °C
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
...