kSIST FprEN 3687:2025
(Main)Aerospace series - Bolts, normal hexagon head, relieved shank, long thread, in heat resisting steel FE-PA2601 (A286), silver plated - Classification: 1 100 MPa/650 °C
Aerospace series - Bolts, normal hexagon head, relieved shank, long thread, in heat resisting steel FE-PA2601 (A286), silver plated - Classification: 1 100 MPa/650 °C
This document specifies the characteristics of silver-plated Bolts normal Hexagon Head with relieved shank and long thread, in heat resisting steel FE-PA92HT (A286), tensile strength class 1 100 MPa at room temperature. The maximum test temperature of the material is 650 °C.
Luft- und Raumfahrt - Sechskantschrauben, Dünnschaft, langes Gewinde, aus hochwarmfestem Stahl FE-PA2601 (A286), versilbert - Klasse: 1 100 MPa/650 °C
No Scope available
Série aérospatiale - Vis à tête hexagonale normale, tige dégagée, filetage long, en acier résistant à chaud FE-PA2601 (A286), argentées - Classification : 1 100 MPa/650 °C
Le présent document spécifie les caractéristiques des vis argentées, à tête hexagonale normale, tige dégagée, filetage long, en acier résistant à chaud FE-PA2601 (A286), de classe de résistance à la traction de 1 100 MPa à température ambiante. La température maximale d’essai du matériau est de 650 °C.
Aeronavtika - Sorniki, normalna šestroba glava, tanko steblo, dolg navoj, iz toplotno odpornega jekla FE-PA2601 (A286), posrebreni - Klasifikacija: 1100 MPa/650 °C
General Information
- Status
- Not Published
- Public Enquiry End Date
- 02-Jul-2024
- Technical Committee
- I13 - Imaginarni 13
- Current Stage
- 5020 - Formal vote (FV) (Adopted Project)
- Start Date
- 27-Oct-2025
- Due Date
- 15-Dec-2025
- Completion Date
- 28-Oct-2025
Relations
- Effective Date
- 11-Oct-2023
- Effective Date
- 11-Oct-2023
Overview
The kSIST FprEN 3687:2025:2024 standard, issued by CEN, defines the specifications for aerospace-grade bolts featuring a normal hexagon head, relieved shank, and long thread. These bolts are manufactured from the heat-resisting steel FE-PA2601 (A286), which is silver plated to enhance surface properties and corrosion resistance. Classified under tensile strength class 1,100 MPa at room temperature and tested up to a maximum temperature of 650 °C, these bolts are engineered for demanding aerospace applications requiring both mechanical reliability and heat resistance.
This updated standard supersedes the previous EN 3687:2010 and incorporates adjustments such as refined surface roughness requirements and corrected dimensional values to ensure precision engineering and compliance with contemporary aerospace manufacturing needs.
Key Topics
Material Quality
The bolts are made from heat resisting alloy FE-PA2601 (A286) according to EN 3761, ensuring high tensile strength (1100 MPa) and superior performance in temperatures up to 650 °C.Bolt Design
The configuration features a normal hexagon head, a relieved shank to reduce stress concentrations, and a long thread for improved engagement. Detailed dimensions, tolerances, and surface roughness standards are specified precisely for manufacturing consistency.Surface Treatment
A silver plating coat applied per EN 2786 Category A with a thickness of 3–6 µm on thread flanks ensures corrosion resistance and surface conductivity. Surface roughness requirements prescribe a maximum Ra of 0.8 µm on bearing surfaces and 3.2 µm on other surfaces before plating.Marking and Designation
Marking complies with EN 2424, guaranteeing traceability essential for aerospace quality control. The bolt designation format simplifies identification by diameter and length codes, streamlining procurement and assembly processes.Standards Alignment
The specification incorporates references to related aerospace standards and ISO norms for thread forms and dimensions, ensuring interoperability and standardized production quality.
Applications
The kSIST FprEN 3687:2025:2024 bolts are ideal for high-performance aerospace applications where strength, temperature endurance, and corrosion resistance are critical. Typical uses include:
Aircraft Structural Assemblies
Bolts securing engine mounts, airframe structures, and other components exposed to thermal stress and vibration.Aeronautical Engine Components
Fastening parts in heat-affected zones requiring sustained mechanical properties at elevated temperatures.Space Industry Hardware
Assemblies in spacecraft where temperature fluctuation and material reliability are paramount.High-Temperature Industrial Equipment
Beyond aerospace, these bolts can be used in power generation equipment and other industrial machinery requiring heat resistant fasteners.
Related Standards
- EN 3761: Specifications for heat-resisting alloy FE-PA2601 bars for forged fasteners.
- EN 2786: Guidelines on electrolytic silver plating of fasteners to ensure corrosion resistance.
- EN 3685: Technical specifications for bolts made from heat resisting steel FE-PA2601 (A286), complementing EN 3687 for design and performance aspects.
- EN 2424: Marking requirements for aerospace products, essential for traceability.
- ISO 3353-1: Standards for rolled external threads, defining thread forms for aerospace fasteners.
- ISO 5855 (Parts 1 & 2): MJ thread requirements covering general specifications and limit dimensions.
- ASME B46.1: Surface texture and roughness standards referenced for quality control prior to plating.
Keywords: aerospace bolts, heat resisting steel FE-PA2601, silver plated bolts, hexagon head bolts, high-temperature fasteners, aerospace fastener standards, tensile strength 1100 MPa, bolt surface roughness, aerospace series bolts, CEN standards.
Frequently Asked Questions
kSIST FprEN 3687:2025 is a draft published by the Slovenian Institute for Standardization (SIST). Its full title is "Aerospace series - Bolts, normal hexagon head, relieved shank, long thread, in heat resisting steel FE-PA2601 (A286), silver plated - Classification: 1 100 MPa/650 °C". This standard covers: This document specifies the characteristics of silver-plated Bolts normal Hexagon Head with relieved shank and long thread, in heat resisting steel FE-PA92HT (A286), tensile strength class 1 100 MPa at room temperature. The maximum test temperature of the material is 650 °C.
This document specifies the characteristics of silver-plated Bolts normal Hexagon Head with relieved shank and long thread, in heat resisting steel FE-PA92HT (A286), tensile strength class 1 100 MPa at room temperature. The maximum test temperature of the material is 650 °C.
kSIST FprEN 3687:2025 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.
kSIST FprEN 3687:2025 has the following relationships with other standards: It is inter standard links to SIST EN 3687:2012, SIST EN 3687:2012/AC:2012. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
kSIST FprEN 3687:2025 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
oSIST prEN 3687:2024
01-junij-2024
Aeronavtika - Sorniki, normalna šestroba glava, tanko steblo, dolg navoj, iz
toplotno odpornega jekla FE-PA2601 (A286), posrebreni - Klasifikacija: 1100
MPa/650 °C
Aerospace series - Bolts, normal hexagon head, relieved shank, long thread, in heat
resisting steel FE-PA2601 (A286), silver plated - Classification: 1 100 MPa/650 °C
Luft- und Raumfahrt - Sechskantschrauben, Dünnschaft, langes Gewinde, aus
hochwarmfestem Stahl FE-PA2601 (A286), versilbert - Klasse: 1 100 MPa/650 °C
Série aérospatiale - Vis à tête hexagonale normale, tige dégagée, filetage long, en acier
résistant à chaud FE-PA2601 (A286), argentées - Classification : 1 100 MPa/650 °C
Ta slovenski standard je istoveten z: prEN 3687
ICS:
49.030.20 Sorniki, vijaki, stebelni vijaki Bolts, screws, studs
oSIST prEN 3687:2024 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
oSIST prEN 3687:2024
oSIST prEN 3687:2024
DRAFT
EUROPEAN STANDARD
prEN 3687
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2024
ICS 49.030.20 Will supersede EN 3687:2010
English Version
Aerospace series - Bolts, normal hexagon head, relieved
shank, long thread, in heat resisting steel FE-PA2601
(A286), silver plated - Classification: 1 100 MPa/650 °C
Série aérospatiale - Vis à tête hexagonale normale, fût Luft- und Raumfahrt - Sechskantschrauben,
dégagé filetage long, en acier résistant à chaud FE- Dünnschaft, langes Gewinde, aus hochwarmfestem
PA2601 (A286), argentées - Classification: 1 100 Stahl FE-PA2601 (A286), versilbert - Klasse: 1 100
MPa/650 °C 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
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 3687:2024 E
worldwide for CEN national Members.
oSIST prEN 3687:2024
prEN 3687:2024 (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 . 4
4.2 Surface roughness . 4
4.3 Material . 5
4.4 Surface treatment . 5
5 Designation . 11
6 Marking . 11
7 Technical specification . 11
oSIST prEN 3687:2024
prEN 3687:2024 (E)
European foreword
This document (prEN 3687:2024) 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 3687:2010.
prEN 3687:2024 includes the following significant technical changes with respect to EN 3687:2010:
— the surface roughness requirements have been replaced from Figure 1 to the text;
— values for S at diameter code 050 in Table 1 have been corrected.
oSIST prEN 3687:2024
prEN 3687:2024 (E)
1 Scope
This document specifies the characteristics of silver-plated Bolts normal Hexagon Head with relieved
shank and long thread, in heat resisting steel FE-PA92HT (A286), tensile strength class 1 100 MPa at
room temperature. The maximum test temperature of the material is 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 2786, Aerospace series — Electrolytic silver plating of fasteners
EN 3685, Aerospace series — Bolts in heat resisting steel FE-PA2601 (A286) — Classification: 1 100
MPa/650 °C — Technical specification
EN 3761, Aerospace series — Heat resisting alloy FE-PA2601 — Softened and cold worked — Bar for
forged fasteners — D ≤ 50 mm — 1 100 MPa ≤ Rm ≤ 1 300 MPa
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, Aerospace — MJ threads — Part 2: Limit dimensions for bolts and nuts
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp/
— IEC Electropedia: available at https://www.electropedia.org/
...
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