EN 3687:2026

SLOVENSKI STANDARD
01-maj-2026
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: EN 3687:2026
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 3687
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2026
EUROPÄISCHE NORM
ICS 49.030.20 Supersedes EN 3687:2010
English Version
Aerospace series - Bolt, 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, tige Luft- und Raumfahrt - Sechskantschraube, Dünnschaft,
dégagée, filetage long, en acier résistant à chaud FE- langes Gewinde, aus hochwarmfestem Stahl FE-
PA2601 (A286), argentées - Classification : 1 100 PA2601 (A286), versilbert - Klasse: 1 100 MPa/650 °C
MPa/650 °C
This European Standard was approved by CEN on 19 January 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 3687:2026 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 . 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
Bibliography . 12

European foreword
This document (EN 3687:2026) 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 September 2026, and conflicting national standards
shall be withdrawn at the latest by September 2026.
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 3687:2010 and EN 3687:2010/AC:2011.
This document includes the following significant technical changes with respect to EN 3687:2010 and
EN 3687:2010/AC:2011:
— 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.
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 characteristics of silver-plated bolts with normal hexagon head, relieved
shank and long thread, in heat resisting steel FE-PA2601 (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 2424:2008, 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 ≤ R ≤ 1 300 MPa
m
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 th
...