kSIST FprEN 3613:2026

• Abstract:

  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

• Status: Not Published
• Public Enquiry End Date: 09-Sep-2025
• ICS: 49.030.20 - Bolts, screws, studs
• Technical Committee: I13 - Imaginarni 13
• Current Stage: 5020 - Formal vote (FV) (Adopted Project)
• Start Date: 02-Jun-2026
• Due Date: 21-Jul-2026
• Completion Date: 09-Jun-2026
• Ref Project: 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

• Revises: SIST 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: 1275 MPa/650 °C
• Effective Date: 12-Feb-2025

kSIST FprEN 3613:2026 is a SIST draft European Standard for aerospace bolts with a normal hexagonal head, relieved shank and long thread, made from heat resisting nickel base alloy NI-PH2601 (Inconel 718) and silver plated. It specifies the bolt characteristics for aerospace applications and assigns the classification 1 275 MPa/650 °C.

What does kSIST FprEN 3613:2026 specify?

kSIST FprEN 3613:2026 specifies the characteristics of a defined family of aerospace bolts. It covers the bolt form, dimensions, material, coating, marking and technical specification needed to identify and control these parts in use.

The document is organized into:

• Clause 1 - Scope
• Clause 2 - Normative references
• Clause 3 - Terms and definitions
• Clause 4 - Required characteristics
• Clause 5 - Designation
• Clause 6 - Marking
• Clause 7 - Technical specification

Figure 1 shows the configuration, and Tables 1 and 2 give the dimensional data and available lengths and masses.

What are the key requirements of kSIST FprEN 3613:2026?

kSIST FprEN 3613:2026 is mainly a product-definition standard. It tells manufacturers and buyers what the finished bolt must look like, what material and coating to use, how to identify it, and which companion standards govern the details.

• Configuration, dimensions, tolerances and masses are defined in Clause 4.1, Figure 1, Table 1 and Table 2. Dimensions are in millimetres and apply after silver plating. In practice, this means inspection has to be done against the finished part, not just the pre-plated blank.
• Thread form and geometry are tied to MJ threads, with lead and runout threads according to ISO 3353-1 and limit dimensions according to ISO 5855-1 and ISO 5855-2. This matters because the thread system determines interchangeability and fit in aerospace assemblies.
• Surface roughness is specified in Clause 4.2 and linked to Figure 1. The note on the figure says the roughness is measured prior to coating, so the process control has to distinguish between the base part and the plated part.
• Material is given in Clause 4.3 as a nickel alloy in accordance with TR 3775, for example SAE AMS5662. For procurement and certification, this means the alloy supply has to be traceable to the named material specification.
• Surface coating in Clause 4.4 requires silver plating all over in accordance with EN 2786, category A, with coating thickness 3 µm to 6 µm on the thread flanks measured at the pitch diameter. That makes the coating a controlled functional requirement, not just a surface finish.
• Edge treatment is required by the figure note, which calls for removal of sharp edges of 0,1 to 0,4. In practice, this reduces handling damage and sharp-edge issues on production parts.
• Designation in Clause 5 uses the standard number plus a diameter code and a length code. This is what procurement and drawing notes use to order the exact bolt variant.
• Marking in Clause 6 follows EN 2424, Category A, at the location shown in Figure 1. This supports traceability after manufacture and during maintenance.
• Technical specification in Clause 7 refers to EN 2583. That means this bolt standard works together with the broader technical specification for the same bolt family and class.

What terms does kSIST FprEN 3613:2026 define?

• NI-PH2601 (Inconel 718) - the heat resisting nickel base alloy named in the scope and material clause.
• MJ threads - the aerospace metric thread system used for these bolts, with general requirements and limit dimensions in ISO 5855-1 and ISO 5855-2.
• Relieved shank - the bolt form with a reduced shank section named in the scope and shown in Figure 1.
• EN 2786 - the standard used for electrolytic silver plating of fasteners.
• EN 2424 - the standard used for marking aerospace products.
• EN 2583 - the technical specification standard for bolts in the same alloy and class.
• SAE AMS5662 - a nickel alloy material specification cited as an example of the material requirement.

Who uses kSIST FprEN 3613:2026?

kSIST FprEN 3613:2026 is used by aerospace bolt manufacturers, fastener suppliers, plating shops, inspection teams, quality managers and purchasers. They use it to specify the bolt on drawings and orders, verify dimensions and coating, control marking, and check that supplied parts match the required aerospace bolt family.

It is also relevant to design engineers and maintenance organizations that need a clearly identified bolt type for aerospace assemblies.

What changed in kSIST FprEN 3613:2026 from the previous edition?

kSIST FprEN 3613:2026 supersedes EN 3613:2009. The foreword states two significant technical changes:

• SAE AMS5662 was added to the material clause.
• The thread surface requirement was removed.

Which standards are used with kSIST FprEN 3613:2026?

• EN 2424 - gives the marking rules for aerospace products.
• EN 2583 - provides the technical specification for bolts with MJ threads in NI-PH2601 (Inconel 718), classification 1 275 MPa/650 °C.
• EN 2786 - gives the requirements for electrolytic silver plating of fasteners.
• ISO 3353-1 - covers lead and runout threads for rolled external threads.
• ISO 5855-1 - gives the general requirements for MJ threads.
• ISO 5855-2 - gives the limit dimensions for MJ bolts and nuts.
• TR 3775 - provides material information for bolts and pins.
• SAE AMS5662 - is a cited nickel alloy material specification.

What does the kSIST FprEN 3613:2026 document contain?

The document contains one configuration figure, two dimensional tables, and the clauses needed to identify and control the bolt. Figure 1 shows the bolt shape, thread area, marking location and edge treatment. Table 1 gives the diameter codes, thread codes and principal dimensions, while Table 2 gives available lengths and masses for the diameter codes.

It also includes a designation example, so users can build a complete ordering designation from the document number, diameter code and length code. The marking and technical specification clauses point to EN 2424 and EN 2583 for traceability and product control.

SLOVENSKI STANDARD
oSIST prEN 3613:2025
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
oSIST prEN 3613:2025 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST prEN 3613:2025
oSIST prEN 3613:2025
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.

oSIST prEN 3613:2025
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
oSIST prEN 3613:2025
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.
oSIST prEN 3613:2025
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
...